多维一致地震激励下钢管混凝土系杆拱桥隔震研究  

Study on seismic isolation of CFST tied arch bridge under multi-dimensional uniform seismic excitation

作　　者：高忠虎[1] 狄生奎[2] 吴云[1] 吴忠铁[1] Gao Zhong-hu;Di Sheng-kui;Wu Yun;Wu Zhong-tie(School of Civil Engineering,Northwest Minzu University,Lanzhou 730030,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]西北民族大学土木工程学院,甘肃兰州730030 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《工程抗震与加固改造》2021年第1期118-124,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：中央高校基本科研业务费专项资金资助项目(31920170068);西北民族大学校级教育教学改革项目(2019XJJG-47);国家自然科学基金项目(51868067);甘肃省建设厅科技攻关项目(JK2019-10)。

摘　　要：为探寻隔震拱桥与非隔震拱桥的地震响应规律,利用MIDAS有限元软件建立了某下承式钢管混凝土系杆拱桥的非隔震与隔震模型,进行了动力特性对比分析,分别在三种多维组合一致地震激励下,对比分析了拱肋位移、速度、绝对加速度、相对加速度以及拱肋和桥墩的内力响应,得出隔震模型拱肋顺桥向和横桥向位移增大,竖向位移减小;拱肋最大速度在两种模型不同方向表现出不同规律;隔震模型拱肋最大绝对加速度、相对加速度减小,且沿拱肋较为平稳;隔震结构拱肋和桥墩最大内力响应除个别外,其余均明显减小。In order to explore the seismic response law of isolated arch bridge and non isolated arch bridge,a non isolated and isolated model of a through CFST tied arch bridge is established by MIDAS finite element software,and the dynamic characteristics are compared and analyzed. Under three multi-dimensional combined uniform seismic excitation,the displacement,velocity,absolute acceleration,relative acceleration of arch rib and pier are compared and analyzed. The results show that the displacement of the arch rib of the isolation model increases along the bridge direction and transverse bridge direction,and the vertical displacement decreases;the maximum speed of the arch rib shows different rules in different directions;the maximum absolute acceleration and relative acceleration of the arch rib of the isolation model decrease,and they are relatively stable along the arch rib;the maximum internal force response of the arch rib and the pier of the isolation structure decreases significantly except for a few.

关 键 词：下承式钢管混凝土拱桥 多维一致地震激励 隔震 铅芯橡胶支座 地震响应 

分 类 号：U448.53[建筑科学—桥梁与隧道工程]