近断层地震作用下考虑温度和碰撞效应的曲线梁桥地震响应分析

为探究大温差地区曲线梁桥在近断层脉冲型地震动作用下的地震响应和碰撞效应，以西北大温差地区某曲线连续梁桥为工程实例，建立全桥非线性有限元模型并考虑变温作用对支座刚度的影响；分别以桥墩内力、支座位移和邻梁碰撞效应为指标研究曲线梁桥在近断层脉冲型地震动作用下的地震反应特性。结果表明:温度越低，地震波作用于结构的内力响应越大；曲线梁桥在地震动作用下邻梁间碰撞为面-面碰撞，且温度越高，碰撞效应越强；高阻尼橡胶支座在低温下体现出较强的耗能能力，在大温差地区的桥梁抗震设计中可作为参考；近断层脉冲地震动相较于远场地震动，结构地震响应更大，对结构的破环性更强，故在近断层地区的桥梁抗震设计中应予以重视。

Seismic response analysis of curved girder bridge under near fault earthquake considering temperature and collision effect

In order to explore the seismic response and collision effect of curved girder bridge under the action of near fault impulse ground motion in the large temperature difference areas,taking a curved continuous girder bridge in the area of large temperature difference in Northwest China as an engineering example,a non linear finite element model of the whole bridge was established with considering the influence of temperature change on the bearing stiffness,and the seismic response characteristics of curved girder bridge under the action of near fault impulse ground motion were studied by taking the internal force of pier,the bearing displacement and the collision effect of adjacent girders as the indexes,respectively.The results showed that the lower the temperature,the greater the internal force response when the seismic wave was applied to the structure.The collision of the curved girder bridge under the action of ground motion was the face to face collision,and the higher the temperature,the stronger the collision effect.The high damping rubber bearing reflected the stronger energy consumption capability at low temperature,which could be taken as reference for the seismic design of bridge in the areas with large temperature difference.Compared with the far field ground motion,the near fault impulse ground motion had larger structure seismic response and stronger destructiveness on the structure,which should be paid attention in the seismic design of bridges in the near fault areas.