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采用非线性时程分析方法,对西部地震区高墩桥梁支座的合理选型进行了研究。比较研究的支座型式包含盆式橡胶支座、四氟滑板支座、板式橡胶支座、铅芯橡胶支座。地震动峰值加速度分别采用了0.15 g和0.20 g。非线性时程分析中考虑了支座的力-位移关系,以及桥墩潜在塑性铰的动力反应。研究结果指出,从抗震角度来看,西部地震区高墩桥梁支座的选型原则是尽量提高结构的刚度,减小梁体位移和墩顶位移。
Nonlinear time history analysis method is used to study the reasonable selection of bridge abutments for high piers in the western seismic region. The comparatively studied bearing types include basin rubber bearing, PTFE sliding plate bearing, rubber bearing plate and lead rubber bearing. The peak acceleration of ground motions are respectively 0.15 g and 0.20 g. Nonlinear time-history analysis considers the force-displacement relationship of the support and the dynamic response of the potential plastic hinge of the pier. The results show that from the seismic point of view, the selection principle of high pier abutments in the western seismic region is to maximize the stiffness of the structure and reduce the displacement of the beam body and the top of the pier.