多级设防水准下大跨连续梁桥减隔震方案优化研究  

Optimization of Vibration Mitigation and Isolation Solutions for Long-Span Continuous Girder Bridge Under Multi-Level Seismic Fortification

作　　者：黄俊豪 黎璟 钱永久[1] 杨华平 金聪鹤 HUANG Jun-hao;LI Jing;QIAN Yong-jiu;YANG Hua-ping;JIN Cong-he(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Railway Investment Group Co.,Ltd.,Chengdu 610094,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]四川省铁路产业投资集团有限责任公司,四川成都610094 [3]成都大学建筑与土木工程学院,四川成都610106

出　　处：《桥梁建设》2020年第6期66-72,共7页Bridge Construction

基　　金：国家自然科学基金项目(51778532)。

摘　　要：为研究多级设防水准下大跨度连续梁桥的减隔震方案与参数优化方法,以某跨径布置为(77+144+77)m的高速铁路连续梁桥为工程背景,采用SAP 2000软件建立全桥有限元模型进行非线性动力时程分析,对比多级设防水准下摩擦摆支座、阻尼器、速度锁定器和联合布设摩擦摆支座、阻尼器方案(组合方案)的减震效率,并对各方案的参数组合进行优化。研究表明:设防水准越高,摩擦摆支座对固定墩墩底弯矩响应的减震效率越高,对梁端位移的限制作用越弱;合理设置阻尼器可将固定墩墩底弯矩响应降低约50%;速度锁定器仅使固定墩地震响应降低17.3%,却使原活动墩地震响应激增93.5%;设防水准越高,组合方案的减震效率越突出,在9度罕遇地震下可使固定墩墩底弯矩响应降低75.5%。To study the vibration mitigation and isolation solutions and parametric optimization for long-span continuous girder bridge under multi-level seismic fortification,the numerical model based on a high-speed railway continuous girder bridge that has three spans of 77,144 and 77 m was built by SAP 2000 to carry out non-linear dynamic time-history analysis.The vibration mitigation effects of several options were compared,including the utilization of pure friction pendulum bearings,dampers,speed lock-up devices and the combined use of friction pendulum bearings and dampers.The parameters of each option were optimized.According to the results,under higher seismic fortification level,friction pendulum bearings have better vibration mitigating effect on the bending moment response in the base of fixed piers,but relatively less capable of restricting girder-end displacement.If the dampers are rationally distributed,the bending moment response in the base of fixed piers can be reduced by 50%,whereas the speed lock-in devices can just make the seismic response of the fixed piers reduce 17.3%,but force the seismic response of the original movable piers soar by 93.5%.Under higher-level seismic fortification,the vibration mitigation efficiency of the combined bearing and damper solutions is more significant,which can allow the bending moment response in the base of fixed piers to reduce 75.5%in the rare 9.0 magnitude earthquakes.

关 键 词：连续梁桥 减隔震设计 参数优化 摩擦摆支座 阻尼器 速度锁定器 多级设防水准 有限元法 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]