English
Język Polski
Weryfikacja poziomu zmęczenia stalowych, nitowanych mostów i wiaduktów kolejowych metodą probabilistyczną i normowymi krzywymi S-N
DOI:
https://doi.org/10.24425/ace.2021.138522Abstrakt
Obecne procedury oceny zmęczenia w europejskich i amerykańskich normach mostowych nie uwzględniają stopnia niepewności w modelach obciążenia i nośności konstrukcji. Jednak zmienność obciążenia cyklicznego i zmienność nośności wynikająca z właściwości materiału i ich degradacji, mają istotny wpływ na weryfikację bezpieczeństwa z uwagi na zmęczenie konstrukcji. Ocena zmęczenia zależy od skumulowanych cykli obciążenia i kategorii zmęczeniowej dla detalu konstrukcyjnego; co z kolei zależy od typu elementu i jego połączeń. Ocena bezpieczeństwa konstrukcji może być przeprowadzona dokładniej przy użyciu metody probabilistycznej, która pozwala na określenie przewidywanego zmęczenia za pomocą prawdopodobieństwa powstania pęknięcia. Ta metoda dostarcza więcej informacji o oczekiwanej przydatności elementu konstrukcyjnego do dalszej eksploatacji; dzięki temu konstrukcja może być użytkowana przez znacznie dłuższy czas. W artykule przedstawiono porównanie oceny zmęczenia z wykorzystaniem Eurokodu, normy amerykańskiej - AREMA oraz nowego podejścia wykorzystującego metodę probabilistyczną. Metody te zademonstrowano na nitowanych, stalowych dzwigarach mostów kolejowych (DPG) z wykorzystaniem danych z monitoringu terenowego.Bibliografia
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