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以某西部山区薄壁大跨刚构-连续组合桥梁为研究对象,分析了非规则大跨刚构-连续组合桥梁纵、横向地震易损性。基于OpenSees平台,建立了其非线性纤维有限元模型。采用曲率作为墩柱损伤指标,位移作为活动盆式支座损伤指标,基于IDA方法分析了该桥在不同地震动下的动态响应,得到桥墩纵、横向地震动作用下的曲率包络图,分析了不同桥墩构造的破坏情况,建立了墩柱以及支座的易损性曲线,讨论了不同墩高对桥墩地震易损性的影响。结果表明:桥墩的纵向地震损伤概率大于横向损伤概率,且墩高越高损伤概率越小;支座横向地震损伤概率大于纵向损伤概率。其研究结果可为非规则刚构-连续组合桥梁的抗震设计提供参考和依据。
Taking a thin-wall long-span rigid-frame composite continuous bridge in western mountainous area as the research object, the vulnerability of long-span rigid-continuous composite bridges in both longitudinal and transverse directions is analyzed. Based on OpenSees platform, a nonlinear finite element model of fiber was established. The curvature is taken as the damage index of the pier and the displacement is taken as the indicator of the damage of the movable support. Based on the method of IDA, the dynamic response of the bridge under different ground motions is analyzed, and the curvature envelope of the bridge under longitudinal and lateral ground motions is obtained. The failure conditions of different pier structures are established, the vulnerability curves of pier columns and supports are established, and the influence of different pier height on the seismic vulnerability of bridge piers is discussed. The results show that the probability of longitudinal earthquake damage of bridge pier is greater than that of transverse damage, and the higher the height of pier is, the lesser probability of damage is. The damage probability of lateral earthquake of bearing is greater than that of longitudinal damage. The results of this study can provide reference and basis for the seismic design of irregular rigid-continuous composite bridges.