Seismic fragility analysis of a continuous rigid-frame bridge during typical construction stages considering internal force state

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (24) : 136-143.

SHI Yan，XIONG Lijun，LI Jun，ZHENG Guozu，PEI Yinhai

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Abstract

To investigate the influence of internal force state (IFS) on seismic fragility of rigid-frame bridge (RFB) in different construction process, based on the equivalent load method, the formulas of equivalent internal force load of main girder and piers for RFB during typical construction stages were developed. Dynamic analysis models corresponding to five typical construction stages with and without IFS were simulated via OpenSees. Selecting 40 groups of near-fault ground motion records as input, the incremental dynamic analysis method was used to carry out the dynamic time history analysis of each typical construction stage considering the construction process or not. Taking curvature ductility as damage index, the seismic fragility of pier bottom, pier top and main girder root were obtained by theoretical fragility method. The results show that the formulas for equivalent internal force loads can be used to accurately calculate and simulate the IFS of the main bridge. The damage probability of the pier bottom, pier top and the main girder root under the same seismic level increases with the increase of the cantilever length in different damage states. Without considering the IFS, the damage probability of pier bottom and pier top will be underestimated, and the underestimation of pier bottom along the longitudinal direction is the most significant. The underestimation of the damage probability of piers will increase with the increase of cantilever length.

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continuous rigid frame bridge / construction process / equivalent load method / internal force state / incremental dynamic analysis / seismic fragility

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SHI Yan，XIONG Lijun，LI Jun，ZHENG Guozu，PEI Yinhai. Seismic fragility analysis of a continuous rigid-frame bridge during typical construction stages considering internal force state[J]. Journal of Vibration and Shock, 2021, 40(24): 136-143

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