连续梁桥的减隔震设计

Seismic Isolation Design of Continuous Girder Bridges

在对桥梁减隔震原理进行分析的基础上 ,依据连续梁桥在地震作用时受力的特点 ,对连续桥梁的固定支座进行了减隔震设计 ,将原来的固定支座改为相对固定 .对该桥在地震荷载作用下的抗震性能分析表明 ,采取减隔震措施后 ,固定墩的受力情况得到明显改善 ,主梁的纵向位移以及梁、墩的相对位移虽有所增大 ,但即使在 8°的地震荷载作用下 。

Based on the analysis of the theory of seismic isolation of bridges,a practical seismic isolation design of the fixed bearing of continuous girder bridges is presented,which changes the fixed bearing into the relatively fixed one.The results from the non linear dynamic seismic response show that,after taking the proposed measures,the seismic response of the fixed pier is reduced greatly.Although the longitudinal displacements of girders and the relative displacements between girders and piers are increased to some extent,even under the extreme severe seismic excitations,the magnitude of either displacement is restrained in the allowable range.