A multispan continuous 3D bridge model is established on the basis of OpenSees platform, and 160 mainshock-aftershock (MA) sequences are constructed in accordance with the bridge site to study their influence on the seismic vulnerability of bridges. The seismic vulnerability of bridge piers, bearings, and abutments subjected to MA sequences is investigated. The influence of MA sequences on the seismic vulnerability of the bridge system is also analysed using first- and second-order boundary estimation methods. Results show that the seismic response and exceedance probability of the bridge components and system subjected to MA sequences are significantly increased compared with those under the consideration of mainshock only. The second-order boundary estimation method based on component correlation coefficient can significantly reduce the upper and lower limit widths of the vulnerability curves and improve the accuracy. Under the same peak ground acceleration (PGA) and damage state, the exceedance probability of the bridge system is higher than that of any component in the system. The exceedance probability under different damage states of the bridge components and system increases with the PGA. For any given PGA, the exceedance probability decreases with the increase in severity of damage state.

中文翻译：

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主震-余震地震序列的多跨连续桥地震易损性分析

在OpenSees平台的基础上建立了多跨连续3D桥梁模型，并根据桥梁部位构造了160条主震-余震（MA）序列，研究了其对桥梁地震易损性的影响。研究了承受MA序列的桥墩，支座和桥台的地震脆弱性。还使用一阶和二阶边界估计方法分析了MA序列对桥梁系统地震易损性的影响。结果表明，与仅考虑主震的情况相比，受MA序列影响的桥梁构件和系统的地震响应和超标概率显着增加。基于分量相关系数的二阶边界估计方法可以显着减小脆弱性曲线的上下限宽度，提高精度。在相同的峰值地面加速度（PGA）和损坏状态下，桥梁系统的超标概率高于系统中任何组件的超标概率。桥梁构件和系统在不同损伤状态下的超标概率随PGA的增加而增加。对于任何给定的PGA，超出概率随损坏状态严重性的增加而降低。桥梁构件和系统在不同损伤状态下的超标概率随PGA的增加而增加。对于任何给定的PGA，超出概率随损坏状态严重性的增加而降低。桥梁构件和系统在不同损伤状态下的超标概率随PGA的增加而增加。对于任何给定的PGA，超出概率随损坏状态严重性的增加而降低。