Evaluation of seismic behaviour of railway bridges considering track-bridge interaction

• Autorzy: Dehghani Ehsan , Najafi Zadeh Maryam , Nabizadeh Azam

Identyfikatory

DOI

10.7409/rabdim.019.004

Warianty tytułu

PL

Ocena zachowania sejsmicznego mostów kolejowych z uwzględnieniem oddziaływania pomiędzy torem i mostem

• Języki publikacji: PL EN

Abstrakty

PL

Mosty kolejowe wykazują dużą odporność na trzęsienia ziemi. Pomimo, że ich wytrzymałość była określana pod względem jakościowym w wielu opracowaniach, m.in. Stowarzyszenia AREMA (ang. American Railway Engineering and Maintenance of Way Association), dotychczas nie zaproponowano kryteriów ilościowych tej oceny. Celem niniejszej pracy jest przedstawienie kryteriów ilościowych oceny zachowania się mostów kolejowych poddanych działaniu obciążeń sejsmicznych. W artykule przedstawiono modele MES odpowiedzi dynamicznej mostów w warunkach sejsmicznych, w których uwzględniono oddziaływanie toru kolejowego z mostem lub to oddziaływanie nie było brane pod uwagę. Badane modele oceniane były z wykorzystaniem analizy pushover i dynamicznej analizy przyrostowej na podstawie czternastu zapisów trzęsień ziemi, które miały miejsce w przeszłości. Wyniki analiz wyraźnie pokazują, że zaproponowany model uwzględniający oddziaływanie toru z mostem zachowuje się w warunkach sejsmicznych lepiej pod względem wytrzymałościowym. W przypadku tego modelu parametry takie jak: przemieszczenie pomostu, siła ścinająca pomiędzy torem i pomostem oraz obrót plastyczny przegubów są mniejsze o odpowiednio 70-90%, 20-83% i 85-100%. W pracy zaproponowano równania do szacowania przemieszczenia pomostu oraz siły ścinającej w podstawie toru, bez uwzględnienia oddziaływania toru z mostem, wykorzystując metodę maksimów przyśpieszenia ziemskiego (ang. Peak Ground Acceleration, PGA), zarejestrowanych podczas wstrząsów sejsmicznych.

EN

Railway bridges have historically performed well in the previous earthquakes. Although this performance has qualitatively been studied in some references such as AREMA code, no quantitative criteria has been proposed for it. Thus, this study aims to present quantitative criteria for railway bridge performance under seismic loads. In the paper, seismic behaviour of railway bridges, with and without track-bridge interaction (TBI), is calculated through finite element modeling. Pushover and incremental dynamic analyses, are utilized to assess the proposed method, considering fourteen records of the past earthquakes. The results clearly show superior performance of the proposed model with track system, in which the deck displacement, base shear, and plastic rotation decrease by 70%-90%, 20%-83%, and 85%-100%, respectively. Finally, two equations are proposed to calculate deck displacement and base shear of railway bridges without performing track-bridge interaction (TBI) by Peak Ground Acceleration (PGA) of the applied record approximately.

Słowa kluczowe

PL

analiza dynamiczna przyrostowa (IDA); analiza nieliniowa; analiza pushover; most kolejowy; oddziaływanie toru z mostem (TBI)

EN

incremental dynamic analysis (IDA); nonlinear analysis; pushover analysis; railway bridge; track-bridge interaction (TBI)

• Wydawca: Instytut Badawczy Dróg i Mostów
• Czasopismo: Roads and Bridges - Drogi i Mosty
• Rocznik: 2019
• Tom: Vol. 18, no. 1
• Strony: 51--66
• Opis fizyczny: Bibliogr. 34 poz., rys., tab.

Twórcy

autor

Dehghani Ehsan

• University of Qom, Department of civil engineering, Khodakaram Blvd., 37195-1519 Qom, Iran

autor

Najafi Zadeh Maryam

• University of Qom, Department of civil engineering, Khodakaram Blvd., 37195-1519 Qom, Iran

autor

Nabizadeh Azam

• University of Wisconsin-Milwaukee, Department of Civil and Environmental Engineering, Milwaukee, WI 53211, Stany Zjednoczone Ameryki Północnej

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