非规则梁桥横向X形弹塑性阻尼器合理参数分析

Analysis of Transverse X shaped Elastic plastic Damper’s Proper Parameters on Irregular Girder Bridges

摘要:

提出采用X形弹塑性阻尼器（XSEPD）代替梁桥混凝土挡块，以控制梁体位移，减小下部结构地震反应.对板式橡胶支座（LRB）与X形弹塑性阻尼器的力与位移关系进行分析，并以一座典型非规则梁桥为例，通过参数分析探讨X形弹塑性阻尼器的不同布置方式对桥梁横向地震反应的影响规律.结果表明，通过适当选取X形弹塑性阻尼器的设计参数，可以有效控制墩梁相对位移，并能合理分配高低墩间所承受的地震力.

关键词:非规则梁桥; 板式橡胶支座（LRB）; X形弹塑性阻尼器（XSEPD）; 布置形式; 设计参数

Abstract:

An X shaped elastic plastic damper (XSEPD) was used to replace the concrete shear key for girder displacement control and seismic response mitigation of substructures. First, the force displacement relationship of laminated rubber bearing (LRB) and XSEPD was analyzed. Then, the effect of different XSEPD layouts on transverse seismic response of the bridge was investigated through parametric study based on a typical irregular girder bridge. Results indicate that XSEPD can effectively control pier girder relative displacement and reasonably distribute seismic forces among piers if the proper design parameters are selected.

Key words:irregular girder bridge; laminated rubber bearing (LRB); X shaped elastic plastic damper (XSEPD); layout; design parameter