预应力混凝土连续梁桥抗震性能研究

摘要

依托某跨径布置为（47.5＋85＋47.5）m的预应力混凝土连续梁桥,计算分析了考虑和不考虑桩基桩-土之间的相互影响对预应力混凝土连续梁桥的动力和抗震性能的影响。采用桥梁分析软件MIDAS/Civil 2010建立了该桥的两种三维有限元模型,进行了自振特性分析,并应用反应谱法和时程分析方法计算了该桥的地震响应。分析结果表明,考虑桩基桩-土之间的相互作用使结构变柔,频率减小;顺桥向抗震设计由制动墩控制;考虑和不考虑桩-土之间的相互作用,对桥梁结构影响复杂。%Taking a prestressed concrete continuous girder bridge with span of（47.5＋85＋47.5） m as an example,the influence taking mutual influence of pile foundation and pile soil into consideration and not,on dynamic and earthquake resistant performance of prestressed concrete continuous girder bridge is calculated and analyzed.Two kinds of three-dimensional finite element model are established with MIDAS/Civil 2010,a bridge analysis software.Natural vibration is analyzed and earthquake response of the bridge is calculated with response spectrum analysis and time history analysis method.The analysis result shows that the structure is more flexible and frequency is smaller while taking the mutual influence of pile foundation and pile soil into consideration;Aseismatic design along bridge direction is controlled by abutment pier;the influence on bridge structure is complicated when taking mutual influence of pile soil into consideration and not.