双柱式简支-桥面连续梁桥横向地震碰撞和防撞措施分析

摘要

The pounding between components of a structure has significant influences on the structural performance under earthquake.Aiming at the transverse pounding of Simply supported-continuous bridge under transverse earthquake,a pounding model of considering the bearing nonlinear、pier columns elastoplastic and soil-foundation interaction is established.On this basis,the effect of the collision between the main beam and the retainer is analyzed,the collision mitigation measures are investigated,and the effect of the collision between two measures is compared.The results indicate that pounding can lead to strong pounding force and amplify the responses of piers.Installed bump rubber inside the retainer and used the LRB could both reduce the impact force,the shear force and the plastic rotation angles at the top and bottom of piers,but the second can recive better effect.%地震作用下,结构的碰撞问题是影响结构地震反应和抗震性能的一个重要因素.本文针对简支-桥面连续梁桥在横桥向地震作用下主梁与抗震挡块间的碰撞行为,建立了考虑支座非线性、墩柱弹塑性以及桩土相互作用的碰撞模型.在此基础上分析了主梁与抗震挡块间的碰撞效应,探讨了减轻碰撞的措施和方法,并比较了两种措施的防撞效果.结果表明:主梁与抗震挡块间的碰撞不仅产生巨大的碰撞力,还会增大桥墩的地震需求,对结构抗震不利；在抗震挡块内侧安装橡胶缓冲垫和采用铅芯橡胶支座均能减小碰撞力、墩顶底的剪力和塑性转角,但后者的防撞效果更好.