连续梁桥在桩-土共同作用下的隔震效果分析

建立了澳门澳凼第三大桥的9跨连续梁桥的梁体、桥墩和基础共同工作的空间有限元分析模型,建立了3种桥梁支座形式的弹簧单元恢复力模型;并分别在顺、横桥向输入EL-Centro波进行连续梁桥的对比时程分析。研究表明:采用铅芯橡胶支座能延长结构的周期;减小桥墩底部的弯矩和剪力,并使剪力得以合理分配;同时梁体位移也得到控制,隔震效果显著。

Analysis on Seismic Isolation of the Continuous Girder Bridge Considered the Interaction of the Pile-soil

A engineering design case about the 9-span continuous girder bridge of the Third Macao-Taipa Bridge in Macao is investigated in this paper,the dynamic analysis model considered the interaction of pile and soil is created by the FEM analysis program-ANSYS,and three kinds of bridge bearings,which are modeled with the different horizontal spring elements,are adopted.In addition,the comparative time history analysis of the continuous girder bridge subjected to EL-centro wave at the longitudinal and lateral side of the bridge are made,respectively.Finally,it is indicated that the lead-rubber bearings are efficient energy dissipative system,it can not only lengthen the natural period of the bridge,reduce the moment value and at the same time the shear values are rationally distributed at the bottom of piers,but also the displacement of the girder body increases to a little extent.