Impact of concrete compressive strength on the reliability and the plastic moment of steel-concrete composite beams

Nabil Daanoune; Nassim Kernou

doi:10.5937/vojtehg73-53935

Nabil Daanoune Univerzitet u Bedžaji, Tehnološki fakultet, Laboratorija za građevinsko inženjerstvo i arhitekturu (LGCA), Bedžaja, Narodna Demokratska Republika Alžir https://orcid.org/0009-0002-8815-3185
Nassim Kernou Univerzitet u Bedžaji, Tehnološki fakultet, Laboratorija za građevinsko inženjerstvo i arhitekturu (LGCA), Bedžaja, Narodna Demokratska Republika Alžir https://orcid.org/0000-0002-5334-0231

DOI: https://doi.org/10.5937/vojtehg73-53935

Ključne reči: spregnuti nosač, nelinearno modeliranje, plastični otporni momenat, analiza pouzdanosti, analiza konačnih elemenata, verovatnoća otkaza

Sažetak

Uvod/cilj: U ovoj studiji ispitan je uticaj čvrstoće betona pri pritisku na pouzdanost i plastični otporni momenat spregnutih nosača od čelika i betona. Cilj je bio da se proceni uticaj različitih čvrstoća betona na ponašanje konstrukcije, s posebnim naglaskom na plastični otporni momenat koji je kritičan za sigurnost i ispunjavanje zahteva za spregnuti nosač.

Metode: Za modeliranje nelineranog ponašanja betona, Abakus je kreirao trodimenzionalni numerički model koji obuhvata model oštećenja betona usled plastičnosti (Concrete Damage Plasticity –CDP model). Analizirana je pouzdanost, a verovatnoća otkaza je procenjena pomoću simulacija Monte Karlo (MCS), kao i pomoću metoda pouzdanosti prvog (FORM) i drugog reda (SORM). Funkcija graničnog stanja određena je prema kriterijumima Evrokoda 4 uzimajući u obzir čvrstoću betona pri pritisku od 25 do 80 MPA.

Rezultati: Pokazano je da čvrstoća betona pri pritisku znatno utiče na plastični otporni momenat i indeks pouzdanosti spregnutog nosača. Visoka čvrstoća betona poboljšava plastični otporni momenat, dok indeks pouzdanosti varira zavisno od svojstava materijala, geometrije spregnutog preseka, kao i uslova opterećenja.

Zaključak: Čvrstoća betona pri pritisku važan je parametar koji određuje strukturne karakteristike i sigurnost spregnutih nosača od čelika i betona. Zato je pri projektovanju i proceni spregnutih konstrukcija neophodno da se varijabilnost čvrstoće betona uzme u obzir kako bi se osiguralo poštovanje standarda pouzdanosti.

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Uticaj čvrstoće betona pri pritisku na pouzdanost i momenat plastičnosti spregnutih čelično-betonskih nosača

Sažetak

Reference

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