大跨钢桁梁桥拓宽改建工程抗震设计研究  

Study of Seismic Protection Design for Long-Span Steel Truss Girder Bridge After Widening and Renovation

作　　者：陈亮 邵长宇 颜海 王臻 徐艳[2] CHEN Liang;SHAO Chang-yu;YAN Hai;WANG Zhen;XU Yan(Shanghai Municipal Engineering Design Institute(Group),Co.,Ltd.,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《桥梁建设》2020年第1期92-98,共7页Bridge Construction

基　　金：上海市交通委员会软科学研究项目(JT2019-KY-012)。

摘　　要：为使拓宽改建后的钢桁梁桥结构体系满足现行的桥梁抗震规范要求,以拓宽改建后的松浦大桥主桥为例进行抗震设计研究。该桥主桥为两联(96+112)m连续钢桁梁桥,在拓宽改建后,上部结构自重明显增加,但下部基础因条件受限无法加固,考虑到该桥缺少必要的延性构件和震后的易修复性,宜采用减隔震设计。设计摩擦摆式减隔震支座和拉索减震支座2种减隔震方案,采用SAP 2000软件建立主桥有限元动力分析模型,研究2种方案的关键设计参数,并综合对比2种方案的减隔震效果。结果表明:摩擦摆式减隔震支座的减隔震效果较好、结构位移较小,但其受力复杂、安装制作繁琐且造价昂贵;拉索减震支座利用自由行程耗散能量,结构位移相对较大,但其受力简单、制作安装方便且易于更换,经济性能好。To ensure that the steel truss girder bridge structure could meet the current bridge anti-seismic specifications after widening and renovation,the Songpu Bridge that has been widened and renovated is cited as an example for the anti-seismic design study.The main bridge is a continuous steel truss girder bridge with two continuous units each consisting of spans of 96 and 112 m.After widening and renovation,the self weight of superstructure significantly increased,but the foundation could not be strengthened due to various limitations.Considering that the bridge lacks necessary ductile components and seismic resilience,a seismic isolation design was proposed.Two seismic isolation schemes of using friction pendulum bearings and cable-sliding friction aseismic bearings were selected.The software SAP 2000 was used to build the dynamic analysis model of the main bridge to determine the key design parameters of the two schemes.The seismic isolation effect of the two schemes were analyzed.The results show that the seismic isolation effect of friction pendulum bearings is better,with small structural displacement induced,but the load bearing condition is complex and the bearings are not economical in terms of prefabrication,installation and costs.The cable-sliding friction aseismic bearings can dissipate energy using their free strokes,the structural displacement induced is relatively big,but the load bearing condition is simple and the bearings are easy to be made,installed and replaced,thus are more economical.

关 键 词：钢桁梁桥 拓宽改建 抗震设计 摩擦摆式减隔震支座 拉索减震支座 设计参数 方案对比 

分 类 号：U448.211[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]