高速铁路连续梁桥地震碰撞效应研究

Study on the seismic pounding responses of high-speed railway continuous beam bridge

以新建高速铁路客运专线三跨连续梁为研究对象,建立典型桥跨结构的空间动力分析模型。选取3条地震波,采用非线性动力时程分析方法,详细研究了考虑碰撞效应时连续梁桥的地震响应特性。结果表明:随着间隙单元初始间隙的减小,相邻梁发生碰撞的次数增加,碰撞力峰值也逐渐变大;当峰值加速度较低时,碰撞效应对连续梁固定墩的位移及内力响应的影响较小,但采用较大的峰值加速度时,碰撞效应对连续梁固定墩的位移及内力响应的影响比较显著。

Taking a new high-speed railway passenger dedicated line 3-span continuous beam bridge as a study object, we have established the spatial dynamic analysis models of representative bridge span. The seismic response characteristics of the bridge considering the pounding effect have been studied in detial to three earthquake waves using nonlinear time history analysis method. The results show that both the pounding times and pounding forces are increased obviously with the decrease of the collision element initial gap. When the peak acceleration is low, the pounding effect has less impact on displacement and internal force of the con- tinuous beam fixed pier. But with the increase of peak acceleration, the impact of pounding effect on displace- ment and internal force is more significant.