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Earthquakes and Structures
  Volume 11, Number 4, October 2016, pages 649-664

Residual seismic performance of steel bridges under earthquake sequence
Zhanzhan Tang, Xu Xie and Tong Wang

    A seismic damaged bridge may be hit again by a strong aftershock or another earthquake in a short interval before the repair work has been done. However, discussions about the impact of the unrepaired damages on the residual earthquake resistance of a steel bridge are very scarce at present. In this paper, nonlinear time-history analysis of a steel arch bridge was performed using multi-scale hybrid model. Two strong historical records of main shock-aftershock sequences were taken as the input ground motions during the dynamic analysis. The strain response, local deformation and the accumulation of plasticity of the bridge with and without unrepaired seismic damage were compared. Moreover, the effect of earthquake sequence on crack initiation caused by low-cycle fatigue of the steel bridge was investigated. The results show that seismic damage has little impact on the overall structural displacement response during the aftershock. The residual local deformation, strain response and the cumulative equivalent plastic strain are affected to some extent by the unrepaired damage. Low-cycle fatigue of the steel arch bridge is not induced by the earthquake sequences. Damage indexes of low-cycle fatigue predicted based on different theories are not exactly the same.
Key Words
    steel arch bridge; earthquake sequence; multi-scale hybrid model; seismic damage; residual seismic capacity; low-cycle fatigue
Zhanzhan Tang, Xu Xie and Tong Wang: Department of Civil Engineering, Zhejiang University, Zhejiang, 310058, China

Zhanzhan Tang: College of Civil Science and Engineering, Yangzhou University, Jiangsu, 225127, China

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