海底地震动作用下隔震桥地震反应  

Seismic response ofthe sea-crossing isolated bridge under offshore ground motion

作　　者：陈宝魁 卢宏飞 宋固全[1] 田钦 范力 CHEN Baokui;LU Hongfei;SONG Guquan;TIAN Qin;FAN Li(School of Civil Engineering and Architecture,Nanchang University,Nanchang,Jiangxi 330031,China)

机构地区：[1]南昌大学建筑工程学院,江西南昌330031

出　　处：《南昌大学学报（工科版）》2020年第3期233-241,共9页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(51868048);中国地震局工程力学研究所基本科研业务费专项资助项目(2018D18);江西省自然科学基金资助项目(20171BAB216045)。

摘　　要：为确定海底地震动对跨海桥梁的影响,以跨海桥梁常使用的隔震连续梁桥为研究对象,输入4次地震中相邻陆地与海底强震台站的7组实测强震记录,通过对比墩顶位移与加速度、墩底弯矩与剪力、墩顶相邻主梁的相对位移、以及隔震支座的耗能与位移等,分析海底地震动对隔震梁桥地震反应的影响。研究表明:海底地震动作用下,结构的地震反应与支座位移均明显增大,并可能造成支座损伤等破坏。In order to research the influence of the offshore ground motion on the sea-crossing bridges,as a commonly used cross-sea bridge structure,the seismic response of a seismic isolation continuous beam bridge was studied by inputting 7 pairs of offshore and onshore strong motion records in 4 earthquakes.Comparing the displacement and acceleration of the pier tops,the bending moment and shearing force of the pier bottoms,the relative displacements of the adjacent main girders at the pier tops,and the energy dissipation and displacement of the seismic isolation bearing,the influence of offshore motions on the seismic response of the isolated bridge was decided.The study found that the seismic response and bearing displacement of the bridge structure weresignificantly increased under offshore ground motion,and may cause thedestructions such as bearing damage etc.

关 键 词：海底地震动 跨海隔震桥梁 地震反应 抗震设计 隔震支座 

分 类 号：TU352.1[建筑科学—结构工程]