Journal of Applied Engineering Science

A FRAMEWORK FOR PROGRESS MEASUREMENT BASED ON INTEGRATED MONITORING OF PREREQUISITES AND WORK PERFORMANCE

Dejan Marinković, Marija Ivanović, Nevena Simić, Nikola Knežević — Fri, 14 Jun 2024 00:00:00 +0200

The successful implementation of construction projects necessitates the establishment of an efficient system for project execution planning and control, with parameters that ensure an effective assessment of the construction work status, timely detection of variance causes, and reliable trend analysis. In this regard, a set of parameters has been developed, among which the actual progress of works on a project holds a significant place. Existing approaches to progress measurement is mostly focused on studying methods for calculating the percentage of completed works and their applicability to specific types of works and organizational levels. However, key issues persist, such as delayed identification of variance causes and inadequate method sensitivity to initial variances when damages are still minor, and potential effects of corrective measures are greatest. Therefore, this paper proposes a framework for progress measurement based on integrated monitoring of prerequisites for tasks and work performances. While progress monitoring at the project level is organized within workflows, monitoring within each workflow is provided for sub-workflows related to ensuring prerequisites, material procurement, and construction work execution. Visualization of sub-workflows is facilitated through planned and actual cumulative curves of completed works in percentage, whose interrelationships promptly indicate potential project issues. The application of the proposed framework ensures better synchronization of construction works, improved control of prerequisites, rapid detection of causes, along with efficient variance management. The framework includes a clear division of responsibilities for implementing sub-workflows, where site management and specialized services of a company are responsible for ensuring prerequisites and material procurement, while production forces of a company primarily handle the execution of construction works. Such an approach allows for direct determination of issues or quick and efficient delineation of responsibilities, which represents a common issue in practice. This contributes to the motivation of employees and enhances the performance of the project management team.

PRELIMINARY ANALYSIS OF THE INFLUENCE OF CHANGING DISTANCE BETWEEN PILES ON HORIZONTAL ACCELERATION ELASTIC RESPONSE SPECTRA FOR PILE-SUPPORTED STRUCTURE

Borko Miladinović, Boris Jeremić, Zvonko Tomanović — Fri, 14 Jun 2024 00:00:00 +0200

In the professional literature, the seismic load of pile-supported structure is divided into kinematic seismic load and inertial seismic load from superstructure. Due to the deficiencies in the legal framework in Montenegro (standard MEST EN 1998 - official Montenegrin counterpart of the European seismic standard Eurocode 8), civil engineers when defining seismic load of the pile-supported structure in practice almost every time treat only inertial seismic load from superstructure. Except the problematic neglect of the kinematic seismic load, the way in which the inertial seismic load is defined is also problematic. Due to the deficiencies in the legal framework not only in our country but also worldwide, civil engineers for defining the inertial seismic load of pile-supported structures in practice use elastic and design (inelastic) acceleration response spectra, which are prescribed generally for structures neglecting type of their foundations. This is rather rough and unrealistic assumption. This paper presents part of the results of 2D dynamic analyses of soil-pile-structure interaction, which were performed using the modern Domain Reduction Method, with the aim of preliminary investigating the seismic response of buildings founded on piles. In particular, the presented results show how changing distance between piles affects to the horizontal acceleration elastic response spectra at the base level of analysed pile-supported RC frame. In this way, pile foundation characteristics influence on the intensity of the superstructure seismic load is indirectly analysed. As expected, preliminary analyses have shown that in case of small distance between the piles (2d or 3d), this influence can be very significant. In this specific case, when the piles at the lower end are fixed in the bedrock, that influence is favourable because smaller elastic spectral accelerations are obtained for the complete range of periods (less seismic load of the superstructure). Of course, for some general conclusions and proposals, it is necessary to perform a significantly larger number of dynamic analyses with different configurations and characteristics of the soil-piles-structure system and seismic excitations. It is planned for the next period.

EXPERIMENTAL TESTING OF 3D PRINTED CONCRETE TRUSS GIRDER

Stefan Mitrović, Milica Vidović, Ivan Ignjatović, Jelena Dragaš — Fri, 14 Jun 2024 00:00:00 +0200

In the last few decades, the technology of 3D concrete printing (3DCP) has had a significant development. This technology has a great potential to improve efficiency in the construction industry. It can provide safer site working conditions, material savings, a reduction of construction time, and a high versatility of architectural and structural design. However, this new technology is still not fully investigated. The wider application is limited by the lack of standards and guidelines for design and production. The literature review showed that, there are only a few studies investigating structural behaviour of 3DCP structures and elements. Beams and walls with and without addition of fibers, reinforcement or cables under ultimate loads were tested. The incorporation of reinforcement in the printing process, connections between printed pieces and long-term behaviour of 3DCP elements under sustained load are opened questions. The topic of this research was an experimental testing of 3DCP truss girder. Printing of truss girder was done using a commercial, ready-to-use premix Sikacrete® 751 3D. In order to print, the printer head was moved in the Z direction to alternately place two desired path layers. A truss girder with dimensions of 87x29x12 cm, without reinforcement, was subjected to a four-point bending test up to failure. During this testing strains in two diagonals, deflection of the two bottom joints, and ultimate force were measured. Ultimate force was 30 kN and the brittle failure of tensioned bottom chord occurred. The force in tensioned diagonal was 13.45 kN and in the compressed one 36.77 kN. Additionally, three samples obtained from the top and bottom chords were tested on axial tension. The tension capacity of samples was 25.12 kN.

ANALYTICAL AND NUMERICAL SOLUTION FOR FREE VIBRATIONS OF LAMINATED COMPOSITE PLATES

Vasilije Bojović, Marina Rakočević — Fri, 14 Jun 2024 00:00:00 +0200

Analytical and numerical free vibration analysis of thick and moderately thick laminated composite plates, with different boundary conditions is performed in this paper. Laminated composite plates with cross-ply and angle-ply orientation of layers are considered. The ply orientation is an angle between the x-axis and the direction of fibres in that ply (layer). Cross-ply laminates are those, which have ply orientations θ of 0° or 90°. Ply orientation of angle-ply laminates is θ and -θ, where 0° ≤ θ ≤ 90°. The analytical and numerical calculation of natural frequencies of vibrations for laminates with symmetric and antisymmetric arrangement of layers is performed. The analytical solution is developed using the Equivalent Single-Layer Theories, the CLPT (Classical Laminated Plate Theory) and the FSDT (First-order Shear Deformation Theory). The numerical calculation is made using the ANSYS software package, which is based on the finite element method. The influence of dimensions, boundary conditions, and ply orientation, on the values of natural frequencies, is analysed. The conducted analysis detected the significant impact of dimensions, boundary conditions, and ply orientation, on the free vibrations of laminated composite plates. Increasing the thickness of the plate, the influence of shear deformation increases. Therefore, in the analysis of thicker plates, the FSDT provides more accurate results, than the CLPT. It is observed that the application of Equivalent Single-Layer Theories (CLPT and FSDT) is justified in the analysis of moderately thick plates, while in the analysis of thick plates, the use of Layerwise theories is recommended.

INFLUENCE OF ACCELERATED AGEING ON PULL-OFF STRENGTH OF CONCRETE PRODUCED WITH RECYCLED CONCRETE AGGREGATE AND BLENDED WITH HEMP FIBERS

Fri, 14 Jun 2024 00:00:00 +0200

As a result of rising demand for non-renewable resources, high energy consumption, and, most importantly, unfavourable environmental consequences, the construction sector is switching to environmentally friendly products. Some feasible options for developing alternative low-cost, renewable and green materials include the utilization of natural fibers and recycled materials from construction and demolition (C&D) waste. This report summarizes a portion of the experimental research being conducted as part of a bilateral research project: ''BIO-based cementitious composites with recycled aggregates (Bio-gates),'' performed by teams from Novi Sad's Faculty of Technical Sciences and Vienna's Technical University. This research explores the impact of hemp fibers and recycled concrete aggregate (RCA) on the pull off strength of concrete, cured under normal conditions and subjected to wet/dry cycles (accelerated ageing regime). The obtained results revealed that RCA has no detrimental effect on the adhesive bond, while hemp fibers reduce the pull off strength of concrete to a greater extent. Nonetheless, adhesion to the substrate may be regarded satisfactory for all tested concrete types when the limit values specified in the applicable regulations are taken into account.

EXPERIMENTAL INVESTIGATION OF ALUMINUM WELDED LATTICE GIRDERS

Šemso Kalač, Naja Zejnelagić, Đorđe Đuričić, Duško Lučić — Fri, 14 Jun 2024 00:00:00 +0200

Aluminum and its alloys are valued for their corrosion resistance, lightweight and versatile functionality within extruded profiles. However, the integration of aluminum into welded truss systems is complicated due to the formation of heat-affected zones (HAZs). In these zones, as a result of the softening effect, the reduction of load-bearing capacity is up to 50%. This complicates the design of welded joints, introducing a significant challenge to the seamless application of aluminum in such structural frameworks. The lack of specific rules for welded aluminum joints in the regulatory standard EN 1999-1-1 (EC 9) contributes to the issue. Consequently, engineers decided to use EN 1993-1-8 (EC 3), a standard not specially designed for aluminum applications, but for steel. This approach obliviously results in a conservative design process that ignores all of the advantages that aluminum alloys provide. In response to this discrepancy, our study examines the behaviour of welded joints within lattice girders, crafted from the EN AW6082 T6 alloy. This is the most widely used aluminum alloy for structures, which has yielding strength values up to those of steel S235. It is known that due to material softening during the welding process, the yield strength in the heat-affected zone (HAZ) of this alloy might drop by up to 50%. All tested lattice girders have the same chord members, which are square hollow section (SHS) 100x5 profiles. The brace members' sizes and shapes have been variated in order to perform the parametric investigation. The three trusses were built using brace members from square hollow section profiles (SHS) with widths of forty, fifty, and sixty mm; the remaining three trusses were built using braces from circular hollow section (CHS) profiles with diameters of forty, fifty, and sixty millimeters. The extensive experimental investigation combined with parametric analysis indicates complex load-bearing behavior depending on cross-section types and size. These results highlight the complex structural behaviour of aluminum lattice girders due to the peculiarity mentioned above which occurs in aluminum due to the heat input as a result of welding.

ASSESSMENT OF TORSIONAL IRREGULARITY PROVISIONS FOR BUILDINGS IN ACCORDANCE WITH EUROCODE 8

Ivan Mrdak, Marina Rakocevic, Đorđe Lađinović — Fri, 14 Jun 2024 00:00:00 +0200

Irregular structures present a particular design challenge for structural engineers, especially if they are located in seismically active areas. It has been observed that in earthquake-affected areas, structures with a configuration classified as torsionally irregular are more prone to damage than regular structures. Modern seismic provisions have introduced criteria for determining if the structure is torsionally sensitive and guidelines for designing them. Eurocode 8 introduces analitical criterion for checking torsional irregularity with the measures such as torsional ratio and the radius of gyration. If structure is classified as torsionally sensitive, it implies limited structural nonlinear behavior, so the design code prescribes use of reduced behaviour factor, use of 3D model and at least modal analysis as structural investigation method. In order to asses provisions given in Eurocode 8 total 18 structures with different layouts and number of floors were analysed and results presented in this paper. Six layouts of structure were created by varying the position of structural elements in order to create different levels of torsional irregularity. Also, number of stories was varied and structures with 6, 9 and 12 were analysed. Effects of static as well as of accidental eccentricity were considered. The obtained results have shown that with only one level of criteria for torsional irregularity given in Eurocode 8, structures with similar configuration can be classified as torsionally regular of irregular. By classifying structure as torsionally sensitive and applying reduced behaviour factor, significant increase of strength capacity is equally imposed on all elements not only elements that are close to perimeter of structure.

FIRE HAZARD AND FIRE RISK ASSESSMENT OF URBAN AREAS IN NORTH MACEDONIA

Meri Cvetkovska; Milica Jovanoska Mitrevska — Fri, 14 Jun 2024 00:00:00 +0200

Fire risk analysis in urban areas is a critical component of urban planning and safety management. It involves assessing the likelihood of fires occurring and the potential impact of those fires on people, property, and the environment. First step is identification of fire hazard. This step involves identification of potential sources of ignition and fuel sources. Next step is assessment of vulnerable assets. Urban areas contain various assets that may be vulnerable to fire, including residential buildings, commercial properties, industrial facilities, transportation infrastructure, and critical facilities such as hospitals and schools. Fire risk analysis involves assessing the vulnerability of these assets to fire and the potential consequences of damage or loss. Evaluation of Fire Spread means understanding how fires may spread within urban areas. It is crucial for assessing fire risk. Factors such as building density, construction materials, urban layout, and prevailing weather conditions can influence the spread of fire. Fire risk analysis also considers the effectiveness of fire prevention measures and emergency response capabilities in urban areas. This includes evaluation of the availability of firefighting resources, the adequacy of fire detection and alarm systems, access to water supplies, and evacuation plans. In addition to assessing physical risks, fire risk analysis may also involve evaluating the vulnerability of specific communities within urban areas. Factors such as socioeconomic status, demographic characteristics, and access to resources can influence the ability of communities to prevent, mitigate, and recover from fires. Overall, fire risk analysis in urban areas is essential for enhancing community safety, protecting property and infrastructure, and promoting sustainable urban development. By understanding and mitigating fire risks, cities can become more resilient to fire-related disasters. This paper presents the results of the fire risk analysis of the urban areas in North Macedonia. Population density and build-up density significantly affect the fire risk. Due to its dense built-up area, Skopje has the highest fire incidence compared to Struga, Gostivar and Strumica.

ESTIMATING DAMAGE PROBABILITY OF THE PRESTRESSED SIMPLE BEAM THROUGH EIGENFREQUENCY MEASUREMENT

Fri, 14 Jun 2024 00:00:00 +0200

The paper proposes a method for modal-based damage assessment in structures where historical data on their modal properties is often missing. This method is based on the measurements of the structure's eigenfrequencies and predefined assumed damage states. Damage is defined at the level of confirming damage existence with a rough estimate of its extent, within the limits of the predefined assumptions. The factors that affect the outcomes of experimental modal analysis of damaged reinforced and prestressed beam elements on structures in use are briefly outlined and the challenges encountered during these analyses and potential solutions are briefly discussed. The method's application is demonstrated on a damaged prestressed concrete simple beam. Bayesian formulation for probability estimation is used to calculate the probability that a beam, characterized by a specific measured natural frequency, is either undamaged or has a certain level of damage. This calculation is based on the results from finite element models created in the Abaqus software suite. In the finite element models, an eigenfrequency distribution, based on the modulus of elasticity distribution, of a prestressed beam is obtained, for different levels of the assumed prestressing force drop and the corresponding damages caused by the force drop. In the presented problem, the modulus of elasticity of concrete is incorporated into the analysis as an uncertain parameter with a normal distribution. Similarly, other uncertain parameters of the actual structure can be modelled.

RESTORATION OF LARGE MODULAR TEETH OF BALL MILL GEARS BY ELECTRO-SLAG SURFACE

Baglan Smailova, Toty Buzauova, Igor Bartenev, Kunsulu Davletova — Tue, 11 Jun 2024 00:00:00 +0200

This article is devoted to researching the possibility of restoring straight-toothed large-module gears by electro-slag surfacing of individual defective teeth. During the work, an installation was designed and manufactured to restore gears that do not require further machining. A comparative analysis of the proposed technology with the traditional surfacing technique was carried out, paying attention to variables such as the composition of the surfacing material used, process parameters, stabilization of the electro-slag process, and ensuring the geometric dimensions and profile of the tooth. The study results demonstrate that the proposed technology provides higher hardness and wear resistance of remanufactured parts compared to traditional methods.

DESIGN OF A COOLING SYSTEM FROM UNDERGROUND THERMAL ENERGY STORAGE (UTES, UNDERGROUND) THERMAL ENERGY STORAGE) BASED ON EXPERIMENTAL RESULTS

Wed, 12 Jun 2024 00:00:00 +0200

Geothermal energy is a renewable and clean source that has been used for electricity generation in some countries since the 50s, the main characteristic to be used in this application is that the subsoil must have a high temperature geothermal resource (+150 °C). However, it can also be used in applications such as air conditioning in places where the temperature is around 30°C; In Europe alone, there are more than one million thermal installations operating by harnessing geothermal energy. The objective of the work was to design a cooling system from the storage of underground energy, for that, it is essential to know the variation of subsoil temperatures during a certain period of time. For this purpose, sensors were used that were installed at different depths and by means of an Arduino, information of a whole year was stored; so that these data are as representative as possible of the energy storage conditions and the changes depending on the seasons that pass. Additionally, the characteristics of the soil (conductivity, humidity and composition) were taken into account, where the equipment is intended to be installed in subsequent works. For the determination of the necessary cooling load, the design requirements of the ASHRAE standard were used and for the design of the underground heat exchanger, references of designs recommended through experimental tests in other research works are included, together with internal fluid methodology and one-dimensional heat transfer. It includes elements that can help improve the dissipation of energy into the subsurface and maintain transfer properties as stable as possible. This design is designed for the air conditioning of a classroom of normal dimensions that are used in the University and therefore avoid the energy consumption of conventional air conditioning equipment.

ROAD TRAFFIC ACCIDENTS FACTOR ON RURAL ARTERIAL ROADS

Novita Sari, Siti Malkhamah, Latif Budi Suparma — Tue, 11 Jun 2024 00:00:00 +0200

In Indonesia, traffic accidents occur on 23.55% of national roads and 75.08% of rural roads. The rural roads were identified as accident-prone areas. As a result, unsafe roads hinder population mobility, disrupt daily life, and reduce access to education, employment, and essential services, thereby affecting the well-being and development of rural communities. To identify the dominant factors that influence the frequency of collisions, a more thorough analysis of the multifactorial causes of traffic accidents in accident-prone areas is necessary. This study focused on analyzing the factors that contribute to road traffic accidents. Cross-tabulation was done using chi-square analysis. The chi-square test does not assume a normal distribution of data, which is beneficial when dealing with real-world data that may not follow normal distribution patterns. This flexibility makes it a robust choice for analyzing traffic accident data, which can be highly variable and not normally distributed. The results of the chi-square analysis for significance values below 0.05 indicate that there is a correlation between accident-causing factors (the independent variable) and collision frequency (the dependent variable). The results indicate that human factors, such as carelessness and high speed, as well as road and environmental factors, such as horizontal alignment, road width, clear zone, road signs, road markings, and land use, influence traffic accidents. Infrastructure factors such as horizontal alignment, road width, clear zones, shoulders, signs, and markings influence traffic accidents because they directly impact road user safety. Non-standard road geometry (horizontal alignment, road width, shoulder width, and clear zone) combined with incomplete road safety facilities (signs and markings) have the potential to cause traffic accidents. Therefore, harmonizing road geometry and equipment is necessary to improve arterial road safety, especially in accident-prone areas. Furthermore, speed management across a variety of land uses is required to reduce traffic accidents.

LUBRICATING MATERIALS AS A NOVEL APPROACH TO REDUCE DEFECTS OF MICRO-DEEP DRAWING FORMING PROCESS

Mon, 03 Jun 2024 00:00:00 +0200

The deep drawing forming process, classified under sheet metal working, is a promising and essential metal forming process that has attracted much interest due to its wide application in micro-production. The process parameters, such as the cross-head speed of the machine, have a significant influence on the quality of the product. The impact of two essential parameters was investigated to minimize or eliminate the product's production defects, such as thinning, tearing, and scratching. The first one was the impact of using two types of lubricating oil (grease and wax), and the products were compared with the dry condition (without using a lubricating oil). The second is the impact of changing the cross-head speed of the machine from 5 to 15 mm/min. This work aims to determine the optimum operating condition that prevents any defect in the product. The results showed that using lubricating oil resulted in better product shape, and the wax is better than grease in eliminating product defects. In addition, the results showed that the lower machine speed is preferred for eliminating production defects, where the final product has no obvious thinning, tearing, or scratching. The final product shape was evaluated visually because eye observation is the only way to judge the product shape.

PROCESS MONITORING IN HYBRID ELECTRIC VEHICLES BASED ON DYNAMIC NONLINEAR METHOD

Yonghui Wang, Syamsunur Deprizon, Chun Kit Ang , Cong Peng, Zhiming Zhang — Mon, 03 Jun 2024 00:00:00 +0200

Highway third-level faults can significantly deteriorate the reliability and performance of hybrid electric vehicle (HEV) powertrains. This study presents a novel process monitoring method aimed at addressing this issue. We propose a multivariate statistical method based on dynamic nonlinear improvement, namely dynamic neural component analysis (DNCA). This method does not require the establishment of precise analytical models; instead, it only necessitates acquiring data from HEV powertrains. Through numerical simulation and real HEV experiments, we demonstrate the effectiveness of this approach in monitoring highway third-level faults. The testing outcomes demonstrate that DNCA outperforms traditional dynamic methods like dynamic principal component analysis (DPCA), conventional nonlinear methods such as kernel PCA (KPCA) and NCA, as well as traditional dynamic nonlinear methods like DKPCA.

SIMULATION MODELING AND IMPROVEMENT OF THE WINDING DRUM COOLING CONDITIONS

Thu, 30 May 2024 00:00:00 +0200

At the Kaz-Metiz LLP plant, there has long been a problem of insufficient drums cooling due to the scale formation, which led to the need for frequent production stops to cool them. To solve this problem, simulation modeling of cooling drums with and without scale was carried out to investigate the heat spread over the body. The results of the stationary analysis in the Ansys application showed the heat propagation across the cross-section of the drum and proved that the resulting scale, having a low thermal conductivity, significantly reduces the heat exchange from the drum wall to water, as a result, the surface of the drum is significantly overheated. Subsequently, the improved drum cooling system was implemented in «Kaz-Metiz» LLP.

BASES OF THE METHOD OF PHYSICAL MODELING OF THE PROCESS OF CRUSHING OF MUNICIPAL SOLID WASTE

Sat, 11 May 2024 00:00:00 +0200

A large number of studies are aimed at increasing the energy efficiency of grinding processes of various solid materials, while maintaining the values of other important indicators, such as material consumption, productivity, etc. Based on this trend, a new method for physically modeling the process of grinding municipal solid waste (MSW) was proposed for the first time. Existing physical modeling techniques are designed for homogeneous and isotropic materials (for example, soil, crushed stone, snow, coal, etc.). The strength properties of solid waste vary widely due to the significant heterogeneity of their components. Consequently, when crushing solid waste, traditional crusher designs have low efficiency in terms of energy intensity, material intensity and product quality. The purpose of this work is to develop a new technique for physical modeling of the grinding process, based on the main principles of similarity theory and modeling, considering the properties of waste heterogeneity. As a result of the research, a block diagram of the physical modeling methodology for the interaction of the working bodies of impact crushing machines with solid waste was developed. A list of tasks for the modeling process and similarity criteria have been determined based on the development of rheological models of the “working body - municipal solid waste” system and the laws of mechanics that characterize the waste grinding process. Based on the developed similarity criteria, scale equations for the grinding process are substantiated and formulas are derived for determining the expected parameters of the original based on the parameters measured on the model. The developed methodology makes it possible to create a crusher design with improved energy efficiency indicators with the least material and labor costs.

ENERGY EFFICIENCY OF A HYBRID ROAD TRAIN WITH AN ACTIVE SEMI-TRAILER FOR ROAD CONSTRUCTION WORK

Sun, 21 Apr 2024 00:00:00 +0200

The previous experience of creating experimental road trains with an active trailer and semi-trailer is analyzed against the background of modern technological capabilities of transport engineering and the logistical needs of modern construction. The expediency of implementing the concept of a road train with an active trailer based on modern electromechanical technologies is shown. The purpose of the study is to increase the energy efficiency of road trains used in construction for transporting long-length objects (beams, piles, bridge trusses, panels, etc.) by using an active trailer link with an electromechanical drive. The study solves the problem of modeling the movement of road trains with passive and active semi-trailers and comparing their energy efficiency and safety indicators. The methods of modeling the movement of cars and road trains, characteristic of the theory of movement of transport vehicles, approaches of theoretical mechanics and applications of differential calculus, applied numerical modeling in the SimuLink environment are used. A mathematical model has been obtained that allows calculating the energy efficiency of a road train when using passive (towed) and active semi-trailers. The cycle of the road train movement has been developed and tested for use in severe road conditions (construction with weak road infrastructure, forest complex, transportation of special cargo). The implementation of the computational model by means of the SimuLink software package is proposed. Based on the simulation results, conclusions are made on the energy efficiency and safety of road trains with an active trailer link with an electromechanical transmission.

THE FLEXURAL BEHAVIOR OF SUSTAINABLE LIGHTWEIGHT CONCRETE HOLLOW CORE SLABS

Samer Abdulhussein, Esraa Jaafar, Maryam Rasheed — Sun, 21 Apr 2024 00:00:00 +0200

Hollow slabs are reinforced concrete slabs with voids that enable less concrete to be used. To promote sustainability goals, this type of slab reduces material use and enhances insulating characteristics. This paper presents an experimental program for studying the flexural behavior of the sustainable hollow Slab elements of lightweight concrete with three different ratios of mixes using additives to choose the best ratio, which is then compared to a solid model with the same concrete mix with the best characteristics to clarify the variations in the structural behavior of voided slabs. In this investigation, hollow slabs with circular plastic tubes of 50mm diameter and 1020 mm length were used, organized as continuous voids with 30 mm spacing between the tubes. Three slabs were created, each measuring 1020 mm long, 420 mm wide, and 100 mm thick. All three slabs were tested via four-point loading. The best mix ratio was chosen and used to build a robust model. To analyse the key advantages of this technology over typical solid slabs, this solid model was compared to the best-performing model among the three hollow core slabs. Several properties such as load-carrying capability, deflection, crack patterns, and failure modes were observed in all loading steps. The results showed that using uniformly distributed uniaxial voids in the slab reduced concrete use by 23% as compared to solid slabs, Notably, the specimen with 200 kg/m³ lightweight aggregate demonstrated greater crack distribution and crack breadth.

BEHAVIOR OF A STEEL STRUCTURE RAILWAY BRIDGE UNDER DYNAMIC LOADINGS

Sun, 31 Mar 2024 00:00:00 +0100

Most old steel structure railway bridges in Indonesia have deteriorated throughout their service life since they were constructed almost a century ago. However, those bridges' performance must be maintained to have essential safety issues and live extension of the railway bridge structure. Therefore, inspecting and evaluating those steel railway bridges is necessary to maintain the service requirement. Vertical deformation of the steel railway bridge caused by dynamic loadings needs to be observed. The objective of the study is to assess the old steel railway bridge by evaluating the strength characteristics of the structures against the working forces, particularly the moving, wind, and seismic loads. In order to understand the phenomena impacted by the dynamic loadings, the steel structure railway bridge was instrumented using deformation sensors, strain gages, accelerometers, and passive infrared. The steel railway bridge was analyzed using a 3D finite element model. This study discussed the influence of dynamic loadings on the steel structure railway bridge. This paper elaborates and provides suggestions to solve problems and recommended action in practice for future study. This paper may be useful for researchers and practicing engineers.

DEVELOPMENT OF FRICTION STIR WELDING TOOL FOR HIGH-DENSITY POLY-ETHYLENE (HDPE)–CASE STUDY: FIBERGLASS COMPOSITE MATERIAL

Dodi Sofyan Arief, Basuki Wirjosentono, Jaswar Koto, M Dalil , Anita Susilawati — Fri, 14 Jun 2024 00:00:00 +0200

This study aims to develop an effective Friction Stir Welding (FSW) method for composite material of High-Density Poly-Ethylene (HDPE) Pipes. The development of welding tool, there was the addition of an external heating source on the shoulder and probe/pin to overcome the problem of lack of heat resulting from friction between the tool and the material to be welded. The case study was conducted to join the short fiberglass-HDPE composite with a type of ratio of 30% by weight of short fibre and 70% by weight of HDPE, which optimizing parameters such as rotating speed, welding speed, and preheating temperature. The FSW joining process for short fiberglass-HDPE composite sheets was carried out using a Fanuc Series 21i-M CNC milling machine as the driving tool with rotational speed (ω) varied in 3 conditions, namely 600 rpm, 800 rpm and 1000 rpm, and welding speed (v) or feeding at 5 mm/minutes and 10 mm/minutes. The temperature was controlled according to the liquid point of High-Density Poly-Ethylene, which was 130oC, and raised to 150oC and 170oC. The 12 pieces of thermocouple were used along the track on the material and jig plates at the top, middle and bottom. Then, the results of joining the sheets were made in the form of specimens with sizes according to ASTM 3039. The tensile tests of the specimens were carried out at a rate of 0.01 mm/s. The results showed the highest tensile strength was an average value of 24.52 MPa at a rotational speed of 800 rpm, the feeding of 5 mm/min and the temperature of 130oC. The lowest tensile strength was an average value of 17.54 MPa at a temperature of 170°C with a speed of 600 rpm.

TOPSIDE OPTIMIZATION METHODS FOR OFFSHORE PLATFORM MASS-SIZE CHARACTERISTICS. UTILIZING MODULAR DRILLING RIGS

Sat, 15 Jun 2024 00:00:00 +0200

Offshore oil and gas production is associated with many times higher capital investments in development than onshore projects. In this regard, operators often give preference to less risky and less capital-intensive onshore projects. This, in turn, slows down the development of offshore production technologies and the development of the huge resource base of the Arctic shelf. Significant influence on the value of capital costs of offshore projects is the cost of offshore field development facilities, including the cost of offshore platforms - floating or stationary offshore oil and gas production structure consisting of topside and substructure, designed to accommodate drilling and/or production equipment, utilities equipment, systems and devices required to perform the functions assigned to the structure. One of the ways to reduce capital expenditures on platform construction is to reduce its weight and size, which can be achieved by using more modern compact technological equipment, improving design and construction technologies, as well as changing the platform concept itself. One of the key and largest functional units of topside offshore platform is the drilling complex. The possibility to quit the construction of the stationary drilling module and drill the well stock by alternative means, using jack-up or modular drilling rig, could become a growth driver for the economics of offshore construction projects. In this paper, a comparative analysis of alternative drilling methods and evaluation of economic efficiency of modular drilling rig application is carried out.

As a result of the study, the following main conclusions were obtained:

The analysis of statistical data has shown that the cost of topside structures linearly depends on the mass and dimensional characteristics, in which regard the optimization issues are highly important;

The analysis of studies has shown the following: the studies do not offer a system of specific solutions to reduce the mass-dimensional characteristics of the upper structure of the offshore platform.

The development of a solution for year-round drilling of the well stock on offshore platforms without the construction of a stationary drilling complex will significantly reduce the capital costs of development.

DEVELOPMENT OF A METHOD FOR DETERMINING THE PARAMETERS OF ENERGY STORAGE DEVICES TO ENSURE UNINTERRUPTED POWER SUPPLY FOR AUXILIARY NEEDS OF AN ELECTRIC TRAIN

Stanislav Istomin, Andrey Shatohin — Sat, 15 Jun 2024 00:00:00 +0200

The aim of this article is to conduct experimental research to determine the energy storage parameters for providing uninterrupted power supply to the auxiliary needs of electric trains. Analytical power calculations for the auxiliary equipment of electric trains were performed based on the operating manual data. Additionally, a statistical method of data processing on the energy consumption of electric trains was applied. The operational fleet and service routes of the motor wagon depot TCh-31 Omsk and OAO "Omsk-Prigorod" of the West Siberian Railway were examined. The ED4M series electric trains were selected for analysis, as they are the most common in the TCh-31 Omsk depot. The auxiliary equipment of ED4M electric trains was investigated, and the nominal power values of units and devices providing auxiliary needs for the motor wagon rolling stock were determined. Key performance indicators of the motor wagon rolling stock were obtained on different operating sections under varying ambient temperatures, based on data from the motion and control parameter recording systems (RPDA-E). This allows for the identification of the most optimal parameters for the electric energy storage system. The developed method will enable potential manufacturers of energy storage systems to define their essential parameters, as well as assess the feasibility of their application on specific electric trains and operating sections. In summary, for the example considered in this article, it is noteworthy that the energy storage system operates in brief intervals. The average duration of the charging mode is 60 seconds, and the returned energy volume by the motor wagon rolling stock, determining the energy capacity, averages 28 kWh at a maximum power of 0.8 MW. Based on these values, it can be concluded that the recuperation energy volume and, consequently, the energy capacity of the storage system are insufficient to cover the electric energy consumption of the electric train in traction mode. Therefore, the storage system, including its use for reducing peak loads during traction mode, can be considered. It is important to note that, for providing uninterrupted power supply to the electric train's own needs throughout the entire journey, the returned electrical energy volume during regenerative braking is also insufficient. This necessitates exploring the charging of the energy storage system at the departure station or during motion from the converter of own needs at times of minimal loading.

ORIENTATION DEPENDENT DIFFERENCES IN ENERGY BREAKDOWN FOR SINGLE OFFICES IN BELGRADE CONTINENTAL CLIMATE

Marija Grujić, Anđela Knežević, Nikola Knežević — Sat, 15 Jun 2024 00:00:00 +0200

Energy breakdown information is an important factor in the process of building design. It gives the designer direction in the decision-making process of choosing the most adequate building design. Location parameters, thus the climate conditions, are the first determining factor for energy breakdown in buildings – it is determining whether we are dealing with a heating or cooling dominated climate. But in the real environment, there are further parameters that can influence energy breakdown in office buildings, such as site parameters. Site characteristics determine the available orientation of the building’s facade and define obstructions to incoming solar radiation. This study deals with differences in orientation dependent energy breakdown in office buildings for Belgrade continental climate. The influence of site obstructions on incoming solar radiation was neglected due to the comparative nature of this study. A set of four different highly glazed facades of a single office was combined with a set of four different glazing types, resulting in sixteen models. The simulation was carried out with full and partial control of visual and thermal comfort. The results in this study show that energy breakdown for different orientations of a single office can have great variations. These variations in energy breakdown are primarily connected with the duration and intensity of insolation on the façade and properties of glazing, such as the percentage of glazed area on the façade (window-to-wall parameter (WWR)) and solar factor (g) and visual transmittance (τ) of glazing and the level of integrated systems for comfort control.

INVESTIGATION OF METHODS FOR OBTAINING LARGE-DIAMETER STEEL GRINDING BALLS

Yermaganbet Abdrakhmanov, Petr Bykov, Khamit Temirtas, Nurbulat Kulumbaev — Sun, 16 Jun 2024 08:19:48 +0200

The article conducts research on the production of large-diameter steel grinding balls by coquille casting in a garland way, which provides the necessary density of castings. The paper analyzes the material costs for the production of grinding balls ∅ 100 mm by casting and screw rolling, which showed a lower value for the casting method. Also in the work, the calculation of the wall thickness of the coquille was carried out using several methods, on the basis of which the structural elements of the existing coquille installation were selected. The conducted research allowed us to propose a new method of coquille casting balls in a garland way with a central calculated refrigerator, which provides the necessary density of castings.

RISK MITIGATION AS A MEDIATING FACTOR IN THE RELATIONSHIP BETWEEN TOP MANAGEMENT SUPPORT AND CONSTRUCTION PROJECT PERFORMANCE

Thu, 13 Jun 2024 00:00:00 +0200

Construction projects are complex and high-risk activities. Project risks can come from various factors, such as technical, environmental, social, and economic factors. Top management support and project risk mitigation are critical factors influencing construction project performance. This research analyzes the influence of top management support and project risk mitigation on construction project performance. This research method uses a quantitative statistical approach based on primary data collected through questionnaires distributed to 50 construction companies in Bali Province, randomly selected from the population of construction companies that comprise large, medium, and small qualifications. Secondary data was obtained through a relevant literature review, which includes three variables, i.e., top management support, project risk mitigation, and construction project performance. The research shows that top management support and project risk mitigation significantly influence construction project performance. Top management support increases worker motivation and productivity, efficiency, work effectiveness, and work quality and safety in construction projects. Meanwhile, risk mitigation improves projects through control, time estimation, information presentation, worker motivation, technology, and resources. In addition, project risk mitigation is a mediating variable in the relationship between top management support and construction project performance.

CIRCULAR ECONOMY AND ITS BARRIERS TO IMPLEMENTATION IN THE CONSTRUCTION SECTOR

Tiana Milović, Mirjana Laban, Anka Starčev-Ćurčin, Vesna Bulatović — Fri, 14 Jun 2024 00:00:00 +0200

The concept of circular economy has become an important topic during the last decade, because it offers a systems solution framework that creates a closed-loop system to minimize waste and maximize resource efficiency in order to achieve a better balance and harmony between economy, environment and society. The construction industry has significant potential to apply a circular economy model since this industry is responsible for considerable global natural resource extraction and solid waste production. Worldwide, more than 10 billion tons of construction and demolition waste are produced annually, while the demolition alone is responsible for 50% of all waste produced by the building sector. In Serbia, the sectors of agriculture, forestry and fishing, mining, manufacturing, electricity, gas and steam supply, water supply and wastewater management, construction and service activities generated 56.3 million tons of waste just during 2020. Although 80% of construction waste can be recycled according to the Agency for Environmental Protection reports the waste recycling has not yet been established in Serbia. On the other hand, Serbia adopted the Roadmap for Circular Economy in Serbia, the Law of Waste Management, the Regulation on the Manner and Procedure of Waste Management from Construction and Demolition, and accepted the conditions of the European Union for linking the European Green Deal with the strategic development of the region by signing the Green Agenda for the Western Balkans. This paper provides a brief literature review that introduces the circular economy by presenting its origin, definition and principles as well as the barriers (five categories: technological, economic, socio-cultural, institutional and regulatory) to its wider adoption in the construction sector.

NATIONAL SEISMIC RISK ASSESSMENT FOR MONTENEGRO

Nina Serdar, Jelena Pejovic — Fri, 14 Jun 2024 00:00:00 +0200

The previous seismic risk assessment for Montenegro was done after the 1979 earthquake for the purpose of developing the Spatial Plan of Montenegro. Following that catastrophic event, a robust response from relevant institutions ensued, focusing on mitigating seismic risk and regulating construction in vulnerable areas. This period witnessed significant strides in projects to revitalize and reconstruct Montenegrin society. As a result of these efforts, a study was developed, representing a valuable document on vulnerability and seismic risk based on the consequences of the 1979 earthquake. Recognizing seismic risk as a dynamic parameter, it is necessary to conduct periodic updates in risk studies. Regrettably, Montenegro's seismic risk assessment remained stagnant until 2021, when extensive research was undertaken as part of a project funded by the European Commission. The Department of Civil Protection (DCP) coordinated the project in which the National Risk Assessment (NRA), focused on nine different natural and technical-technological risks, was developed. The participation of the national DCP ensured the scientific community's involvement, including the researchers from the University of Montenegro, the Faculty of Civil Engineering and the National Seismological Institute. This collaboration, guided and coordinated by the DCP, resulted in the successful completion of a new national seismic risk assessment. The paper briefly presents results and methodology for seismic risk assessment, providing details on available and used data for exposure and vulnerability models. The discussion includes results on damages (residential buildings and road infrastructure), impact on people, economic losses and presentation of political and social impacts for two earthquake scenarios. Finally, the seismic risk level is calculated and presented in risk matrices.

RANKING OF TOTAL TIME RESERVES FOR DETERMINATION OF THE CRITICAL PATH IN FUZZY NETWORK PLAN

Vasko Gacevski, Marijana Lazarevska, Zlatko Zafirovski — Fri, 14 Jun 2024 00:00:00 +0200

The Critical Path Method, as a method of network planning, is used in the process of planning and control of complex projects from various fields. For their successful implementation, a clear determination of the duration of each project activity is necessary. However, in construction sector it is very difficult to fulfil this requirement, because the realization of many activities is accompanied by a certain degree of uncertainty and risk. Since construction projects are characterized by uniqueness and unrepeatability, there are often no available historical data for a clear and precise determination of the duration of project activities. Given that, the duration should be predicted by expert and experienced persons, who, in the conditions of unique influencing factors and facing many inaccuracies, should define their decisions during the whole process of project management. Due to the shortcomings of classical planning methods, related to the calculation of the duration of project activities, which does not offer the possibility of modelling complex construction projects, there was a real need for the definition and implementation of new concepts of planning. As an alternative way to model uncertainty and risk, the fuzzy concept was introduced in the planning process, with which the durations of project activities are presented through fuzzy numbers. This fundamental approach, which is based on the application of fuzzy theory, enables advanced and successful modelling of real situations and projects, which overcomes the shortcomings characteristic of classical planning methods. This paper gives an overview of one practical example of application of fuzzy logic in the planning process. One method of ranking fuzzy numbers has been applied for calculation of the earliest and the latest fuzzy time of project activities, and the total time reserves, in order to determine the critical path in fuzzy network diagrams.

THE GENERAL STATE OF WATER RESOURCES IN MONTENEGRO

Goran Sekulić, Ivana Ćipranić, Milena Ostojić, Olga Ćalasan — Fri, 14 Jun 2024 00:00:00 +0200

Water resources are essential for the functioning of societies and ecosystems, affecting public health, food production, industry and overall environmental stability. A country's ability to manage and maintain its water resources is closely related to economic prosperity, social well-being and ecological health. The paper shows Montenegro's current state of water resources, highlighting negative trends and challenges. It focuses on three significant issues: difficulties securing sufficient water quantities, escalating problems related to water protection from floods, and growing threats to humans and the environment due to water pollution and ecosystem destruction. Global climate change exacerbates these challenges, affecting rainfall patterns and leading to destructive water waves. Despite the apparent abundance, the irregular distribution of water resources poses a significant problem, particularly in the Dinaric karst area. The paper discusses limitations in water resource management, emphasising the challenges posed by spatial, ecological, urban, and sociological factors. It also addresses the untapped hydro energy potential in Montenegro, highlighting the country's dependence on electricity imports despite having the capability to generate a substantial portion through hydro energy. The general conclusion emphasises the need for a comprehensive and sustainable approach to solving the complex challenges facing water resources in Montenegro. Finally, the paper calls for increased international cooperation in developing and implementing effective policies for the sustainable use and preservation of water resources as one of the most critical resources of a country.

IMPACT OF DEVASTATING EARTHQUAKES IN CROATIA IN 2020

Fri, 14 Jun 2024 00:00:00 +0200

At the beginning of 2020, the area of Zagreb was hit by an earthquake of magnitude Mw5.4, where a significant number of buildings in the historic core of the city was damaged. Not long after that, at the end of the same year, a strong earthquake of magnitude Mw6.4 hit the area of Sisak-Moslavina County, which is about 50 km away from Zagreb. It was a significantly stronger earthquake that had enormous consequences for that region and much wider. Earthquakes struck during the Covid-19 pandemic and shocked the whole country. This multi-hazard scenario surprised everybody, as the country was not ready. Regardless, in the first hours after the earthquake, a system of damage assessment was established based on experts from the academic and professional community, which would later grow into Croatian Centre for Earthquake Engineering. From a technical point of view, this paper refers to the response of the system to the earthquakes, post-earthquake activities of Croatian Centre for Earthquake Engineering and with challenges and problems in organization of damage inspection of the buildings. The paper briefly describes the earthquake scenarios in Zagreb and Petrinja. The typical vulnerable buildings typology and damage are described, trying to find explanations and guidelines for the future earthquakes. The focus is on the unreinforced masonry buildings and out of plane failures which prevail in damage, especially in historical buildings of cultural heritage. Such significant damage to buildings of historical importance makes us think about the way of their future protection and restoration that will follow. Also, some positive experiences in construction practice are highlighted. At the end, a perspective is given for the further development and improvement of the post-earthquake response system, and the need for cooperation of several professions is highlighted in order to obtain a synchronized response to earthquakes. In addition, international cooperation in the organization of the system before and after the earthquake is of key importance.

THE FUTURE OF SEISMIC DESIGN OF STEEL STRUCTURES PR EN 1998-1-1 AND PR EN 1998-1-2

Petar Subotić, Mladen Muhadinović, Biljana Sćepanović, Duško Lučić — Fri, 14 Jun 2024 00:00:00 +0200

The first generation of Eurocode 8 has appeared some twenty years ago. At that time, it presented a brand new and modern seismic standard. But twenty years is a relatively long period and during it a lot has been happening in the field of seismic design of buildings. Latest scientific research together with the identified shortcomings in the current version of Eurocode 8 created a need for it to be updated. Bearing that in mind European commission began to work on the second generation of Eurocodes. They are expected to be finished and ready for adoption in a sequential manner at the start of 2026. In this paper the first draft of the second generation of Eurocode 8 (parts 1-1 and 1-2) is presented with specific attention being paid to seismic design of steel structures. The main part of Eurocode 8 which was EN 1998-1-1 is now divided into two parts: EN 1998-1-1 and EN 1998-1-2. These two documents combined give basic rules for the design of seismic resistant structures. They are massive, comprehensive and filled with novelties and latest scientific research in the area of seismic design. Bearing in mind that the two before mentioned drafts have over five hundred pages combined and that this paper can only be so long only the most important novelties are presented without going too much into details. The topics that are covered in this overview paper are general concept of seismic design and representation of seismic action, soil classification and site amplification effects, methods of seismic analysis and seismic design of steel structures. With all proposed changes and advances in mind it is safe to say that the second generation of Eurocode 8 will be a large step forward and will set a high bar for other seismic standards to reach. The advances that are made in field of steel structures will make them even more attractive in earthquake prone areas.

3D DOCUMENTATION OF CULTURAL HERITAGE USING TERRESTRIAL LASER SCANNING

Arli Llabani, Freskida Abazaj — Wed, 12 Jun 2024 00:00:00 +0200

This study presents a comprehensive exploration of the application of terrestrial laser scanning (TLS) technology for the 3D documentation of cultural heritage, focusing on the iconic Clock Tower of Tirana as a case study. Terrestrial laser scanning has emerged as a powerful tool in the field of cultural heritage preservation, offering a non-intrusive and highly accurate method for capturing the intricate details of historical structures. The research employs state-of-the-art TLS equipment to create a detailed 3D model of the Clock Tower, a prominent cultural landmark in Tirana, Albania. The methodology involves scanning the exterior of the tower, capturing its architectural features, ornate decorations, and historical elements. The high precision of TLS facilitates the generation of a point cloud, enabling the creation of an accurate digital replica that serves as a valuable resource for conservation, research, and education. The study also explores the challenges and benefits associated with TLS technology in the context of cultural heritage documentation. Issues such as data processing, registration, and integration of multiple scans are addressed, emphasizing the importance of a meticulous approach to ensure the reliability of the 3D model. Additionally, the research highlights the potential of the digital model in supporting conservation efforts, risk assessment, and virtual tourism, promoting accessibility and understanding of cultural heritage for a wider audience. The findings of this study contribute to the growing body of knowledge on 3D documentation techniques for cultural heritage preservation and provide insights into the specific application of terrestrial laser scanning in the context of the Clock Tower of Tirana. The results underscore the significance of leveraging advanced technologies to safeguard and promote the rich cultural heritage embedded in historical structures, fostering a deeper appreciation for the past while ensuring its preservation for future generations

CORRIGENDUM TO “INTEGRATION PLANNING BETWEEN COMPONENTS OF TYPE B BUS STATION SUKOREJO ”

Nada Stanojevic — Sun, 16 Jun 2024 17:46:03 +0200

CLARIFICATION

The author’s name Dessy Angga Afriyanti was misprinted within the article in subject published in 22(2024)1, 1181, 223-233, DOI:10.5937/jaes0-45719. Authors’ name should be corrected as follows:

Journal of Applied Engineering Science

A FRAMEWORK FOR PROGRESS MEASUREMENT BASED ON INTEGRATED MONITORING OF PREREQUISITES AND WORK PERFORMANCE

PRELIMINARY ANALYSIS OF THE INFLUENCE OF CHANGING DISTANCE BETWEEN PILES ON HORIZONTAL ACCELERATION ELASTIC RESPONSE SPECTRA FOR PILE-SUPPORTED STRUCTURE

EXPERIMENTAL TESTING OF 3D PRINTED CONCRETE TRUSS GIRDER

ANALYTICAL AND NUMERICAL SOLUTION FOR FREE VIBRATIONS OF LAMINATED COMPOSITE PLATES

INFLUENCE OF ACCELERATED AGEING ON PULL-OFF STRENGTH OF CONCRETE PRODUCED WITH RECYCLED CONCRETE AGGREGATE AND BLENDED WITH HEMP FIBERS

EXPERIMENTAL INVESTIGATION OF ALUMINUM WELDED LATTICE GIRDERS

ASSESSMENT OF TORSIONAL IRREGULARITY PROVISIONS FOR BUILDINGS IN ACCORDANCE WITH EUROCODE 8

FIRE HAZARD AND FIRE RISK ASSESSMENT OF URBAN AREAS IN NORTH MACEDONIA

ESTIMATING DAMAGE PROBABILITY OF THE PRESTRESSED SIMPLE BEAM THROUGH EIGENFREQUENCY MEASUREMENT

RESTORATION OF LARGE MODULAR TEETH OF BALL MILL GEARS BY ELECTRO-SLAG SURFACE

DESIGN OF A COOLING SYSTEM FROM UNDERGROUND THERMAL ENERGY STORAGE (UTES, UNDERGROUND) THERMAL ENERGY STORAGE) BASED ON EXPERIMENTAL RESULTS

ROAD TRAFFIC ACCIDENTS FACTOR ON RURAL ARTERIAL ROADS

LUBRICATING MATERIALS AS A NOVEL APPROACH TO REDUCE DEFECTS OF MICRO-DEEP DRAWING FORMING PROCESS

PROCESS MONITORING IN HYBRID ELECTRIC VEHICLES BASED ON DYNAMIC NONLINEAR METHOD

SIMULATION MODELING AND IMPROVEMENT OF THE WINDING DRUM COOLING CONDITIONS

BASES OF THE METHOD OF PHYSICAL MODELING OF THE PROCESS OF CRUSHING OF MUNICIPAL SOLID WASTE

ENERGY EFFICIENCY OF A HYBRID ROAD TRAIN WITH AN ACTIVE SEMI-TRAILER FOR ROAD CONSTRUCTION WORK

THE FLEXURAL BEHAVIOR OF SUSTAINABLE LIGHTWEIGHT CONCRETE HOLLOW CORE SLABS

BEHAVIOR OF A STEEL STRUCTURE RAILWAY BRIDGE UNDER DYNAMIC LOADINGS

DEVELOPMENT OF FRICTION STIR WELDING TOOL FOR HIGH-DENSITY POLY-ETHYLENE (HDPE)–CASE STUDY: FIBERGLASS COMPOSITE MATERIAL

TOPSIDE OPTIMIZATION METHODS FOR OFFSHORE PLATFORM MASS-SIZE CHARACTERISTICS. UTILIZING MODULAR DRILLING RIGS

DEVELOPMENT OF A METHOD FOR DETERMINING THE PARAMETERS OF ENERGY STORAGE DEVICES TO ENSURE UNINTERRUPTED POWER SUPPLY FOR AUXILIARY NEEDS OF AN ELECTRIC TRAIN

ORIENTATION DEPENDENT DIFFERENCES IN ENERGY BREAKDOWN FOR SINGLE OFFICES IN BELGRADE CONTINENTAL CLIMATE

INVESTIGATION OF METHODS FOR OBTAINING LARGE-DIAMETER STEEL GRINDING BALLS

RISK MITIGATION AS A MEDIATING FACTOR IN THE RELATIONSHIP BETWEEN TOP MANAGEMENT SUPPORT AND CONSTRUCTION PROJECT PERFORMANCE

CIRCULAR ECONOMY AND ITS BARRIERS TO IMPLEMENTATION IN THE CONSTRUCTION SECTOR

NATIONAL SEISMIC RISK ASSESSMENT FOR MONTENEGRO

RANKING OF TOTAL TIME RESERVES FOR DETERMINATION OF THE CRITICAL PATH IN FUZZY NETWORK PLAN

THE GENERAL STATE OF WATER RESOURCES IN MONTENEGRO

IMPACT OF DEVASTATING EARTHQUAKES IN CROATIA IN 2020

THE FUTURE OF SEISMIC DESIGN OF STEEL STRUCTURES PR EN 1998-1-1 AND PR EN 1998-1-2

3D DOCUMENTATION OF CULTURAL HERITAGE USING TERRESTRIAL LASER SCANNING

CORRIGENDUM TO “INTEGRATION PLANNING BETWEEN COMPONENTS OF TYPE B BUS STATION SUKOREJO ”

CLARIFICATION

The author’s name Dessy Angga Afriyanti was misprinted within the article in subject published in 22(2024)1, 1181, 223-233, DOI:10.5937/jaes0-45719. Authors’ name should be corrected as follows:

Dessy Angga Afrianti

This addition does not affect the original paper. We apologize for any inconvenience that this may have caused.