Development of Fragility Curves for Tehran Multi-Cell Box Girder Bridges

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Salili, Sahand | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49070 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Bakhshi, Ali
Abstract:
Bridges are one of the most important parts of the transportation network and play an important role in relief after earthquakes. Therefore, detecting where and how much damage take place is vital. Bridge structure is consist of two parts: substructure and superstructure. Usually, superstructure remains intact during earthquake because of rigidity and high strength of it. In the other hand, damage localizes to substructure. We also use high safety factor to piles and cap piles so they experience little or no damage. As a result, columns suffer damage more than other parts. In this study, the focus is on columns damage. This study also is limited to non-prestressed multi-cell box girder bridges with normal span length. Studying the bridges seismic behavior, this thesis uses fragility curves. For this reason, lots of nonlinear time-history analyses have been conducted with SAP2000 software. 4 bridge models with 2 and 3 spans 15 and 30 meters long each are considered. Uncertainties in the structural elements specifications have been considered as random variebles. 3 earthquake records have been used in the analysis. Finally, Fragility curves for 4 bridges have been drawn
Keywords:
Fragility Curve ; Reliability ; Bridges ; Damage Index ; Girders

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