组合减隔震装置在非对称独塔斜拉桥抗震设计中的应用  

Application of Combined Seismic Isolation Device in Seismic Design of Ansymmetrical Single-tower Cable-stayed Bridge

作　　者：王克勤 季日臣[1] 夏修身[1] 张红涛 WANG Keqin;JI Richen;XIA Xiushen;ZHANG Hongtao(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;The 4th Engineering Co.Ltd.of China Railway 12th Bureau Group,Xi’an 710021,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]中铁十二局第四工程有限公司,西安710021

出　　处：《铁道建筑》2022年第12期134-137,142,共5页Railway Engineering

基　　金：国家自然科学基金(52068041)。

摘　　要：建立太城溪特大桥有限元模型,采用非线性时程分析法研究组合减隔震装置对非对称独塔斜拉桥过渡墩横桥向的隔震效果。结果表明:与常规球型钢支座相比,铅芯橡胶支座使过渡墩墩底横向弯矩减少39%~52%,墩顶横向位移增加41%~79%;组合减隔震装置使过渡墩墩底横向弯矩减小36%~58%,墩顶横向位移减小33%~48%;组合减隔震装置降低了地震响应且避免结构发生过大位移,可以用于解决非对称独塔斜拉桥的横桥向抗震问题。The finite element model of Taichengxi super large bridge was established,and the seismic isolation effect of the combined seismic isolation device on the transverse direction of the transition pier of the asymmetric single-tower cable-stayed bridge was studied by using the nonlinear time history analysis method.The results show that compared with the conventional spherical steel bearing,the lead rubber bearing can reduce the transverse bending moment at the bottom of the transition pier by 39%~52%,and increase the transverse displacement at the top of the pier by 41%~79%.The combined seismic isolation device reduces the transverse bending moment at the bottom of the transition pier by 36%~58%,and the transverse displacement at the top of the pier by 33%~48%.The combined seismic isolation device can reduce the seismic response and avoid excessive displacement of the structure,which can be used to solve the transverse seismic problem of asymmetric single-tower cable-stayed bridge.

关 键 词：铁路桥梁 斜拉桥 横向抗震 非线性时程分析 过渡墩 组合减隔震装置 常规球型钢支座 铅芯橡胶支座 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]