近场旋转地震波对多跨高墩连续刚构桥地震易损性的影响

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (1) : 146-159.

论文

赵金钢1，贾宏宇2，占玉林2,3

作者信息 +

Effects of near-field rotating seismic waves on seismic vulnerability of multi-span high-pier continuous rigid frame bridge

ZHAO Jingang1, JIA Hongyu2, ZHAN Yulin2,3

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文章历史 +

摘要

为研究近场旋转地震波对多跨高墩连续刚构桥易损性的影响，以某五跨高墩连续刚构桥工程实例为研究对象，首先基于改进云图法，从太平洋地震工程研究中心强震数据库中选取100条近场平动地震波，并采用频域法合成旋转地震波；然后，选取桥梁设计参数随机变量，采用拉丁超立方法抽取100个样本点并随机组合后，采用OpenSees建立100个全桥有限元模型，开展近场平动地震波和近场平动+旋转地震波作用下的动力非线性分析，获得高墩关键截面曲率响应最大值；最后以截面曲率临界值为损伤指标，研究适用于近场平动+旋转地震波作用下易损性分析的地震强度指标，并开展地震易损性分析。研究结果表明：地震动强度指标PGD和Sdmax最适用于近场平动+旋转地震波作用下多跨高墩连续刚构桥易损性分析；近场旋转地震波显著增大了多跨高墩连续刚构桥的损伤概率，忽略旋转地震波的影响将严重低估多跨高墩连续刚构桥的损伤概率，并且采用截面曲率作为损伤指标无法较好地反映扭转分量地震波引起的损伤。本项目研究成果对更为全面了解多跨高墩连续刚构桥桥梁的抗震性能、完善桥梁抗震设计及加固理论具有重要意义。
关键词：多跨高墩连续刚构桥；旋转地震波；地震易损性分析；改进云图法

Abstract

In order to study the influence of near-fault rotational seismic waves on the fragility of multi-span high-pier continuous rigid frame bridge, a five-span high-pier continuous rigid frame bridge is taken as the research object. Firstly, based on the improved cloud chart method, 100 near-field translational seismic waves are selected from Pacific Earthquake Engineering Research Center ground motion database, and the rotational seismic waves are synthesized using the frequency domain method. And then, the random variables of bridge design parameters are selected, 100 sample points are extracted by the Latin hypercube method and randomly combined, and the OpenSees is used to establish 100 whole bridge finite element models to carry out dynamic nonlinear analysis under the action of near-field translational seismic waves and near-field translational + rotational seismic waves for obtaining the maximum curvature values of the key sections of high-piers. Finally, taking the critical values of the section curvature as the damage index, the seismic intensity index which suitable for fragility analysis under near-field translational + rotational seismic waves is studied, and the seismic fragility analysis is performed. The results show that the seismic intensity indexes PGD and Sdmax are most suitable for the fragility analysis of the multi-span high-pier continuous rigid frame bridge under the action of near-field translational + rotational seismic waves. The near-field rotational seismic waves significantly increase the damage probability of multi-span high-pier continuous rigid frame bridges. Therefore, ignoring the effects of rotational seismic wave would seriously underestimate the damage probability of multi-span high-pier continuous rigid frame bridges, and using the sectional curvature as the damage index can not well reflect the damage caused by the torsional component seismic waves. The research results of this paper are of great significance for a more comprehensive understanding of the seismic performance of multi-span high-pier continuous rigid frame bridge and improving the bridge seismic design and reinforcement theory.
Key words: multi-span high-pier continuous rigid frame bridge; rotational seismic wave; seismic fragility analysis; improved cloud chart method

导出引用

赵金钢1，贾宏宇2，占玉林2,3. 近场旋转地震波对多跨高墩连续刚构桥地震易损性的影响[J]. 振动与冲击, 2023, 42(1): 146-159

ZHAO Jingang1, JIA Hongyu2, ZHAN Yulin2,3. Effects of near-field rotating seismic waves on seismic vulnerability of multi-span high-pier continuous rigid frame bridge[J]. Journal of Vibration and Shock, 2023, 42(1): 146-159

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