结构损伤对系杆拱桥结构性能的影响研究  

Study of Influences of Structural Damage on Structural Performance of Tied Arch Bridge

作　　者：孙广俊[1] 李正嘉 章世祥 武建 SUN Guang-jun;LI Zheng-jia;ZHANG Shi-xiang;WU Jian(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;China Design Group Co.,Ltd.,Nanjing 210014,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211816 [2]中设设计集团股份有限公司,江苏南京210014

出　　处：《桥梁建设》2018年第2期61-66,共6页Bridge Construction

基　　金：国家自然科学基金项目(51308293);江苏省交通运输科技项目(2015T48);江苏省大学生创新创业训练计划(201710291102Y)~~

摘　　要：为了研究系杆拱桥在关键构件损伤后的安全性能和内力重分布规律,以某钢管混凝土系杆拱桥为背景,采用MIDAS Civil软件建立全桥有限元模型,设置吊杆损伤、吊杆失效和拱肋损伤不同工况,对比分析该桥在损伤状态和完好状态下的结构性能,分析损伤状态对其动力特性、稳定性、结构位移和内力的影响。结果表明:吊杆损伤、失效和拱肋损伤会使桥梁整体刚度降低、自振频率减小,但对振型基本没有影响;吊杆损伤、失效和拱肋损伤会导致桥梁稳定性降低,但降低幅度较小,对失稳形式没有影响;吊杆损伤会引起桥面竖向位移和吊杆应力增加,但对拱肋弯矩影响不大;吊杆失效会对其相邻部位产生显著影响,使结构发生显著的内力重分布;拱肋损伤对桥面竖向位移和吊杆应力影响很小,对拱肋弯矩影响较大。To study the safety performance and internal force redistribution law of the tied arch bridge with the damaged critical components,a concrete-filled steel tube tied arch bridge was cited as an example and the finite element model for the whole bridge of the bridge was established,using the software MIDAS Civil.The different conditions of the suspender damage,suspender failure and arch rib damage were set,the structural performance of the bridge in the damage state and in the intact state was compared and analyzed and the influences of the damage state on the dynamic characteristics,stability and on the structural displacement and internal forces of the bridge were analyzed as well.The results indicate that the suspender damage,suspender failure and arch rib damage causes the global stiffness and natural vibration frequencies of the bridge to decrease,but will basically have no influences on the vibration modes.The damage and failure causes the stability of the bridge to decrease,but the decreasing amplitude is slight and will have no influences on the instability.The suspender damage causes the bridge deck to vertically displace and the suspender stresses to increase,but will have no great influences on the arch rib bending moment.The suspender failure has obvious influences on the parts adjacent to the suspenders and will cause the structure to have the obvious internal force redistribution.The influences of the arch rib damage on the deck vertical displacement and suspender stresses are slight,but on the arch rib bending moment are great.

关 键 词：系杆拱桥 钢管混凝土 结构损伤 动力特性 稳定性 位移 内力 

分 类 号：U448.225[建筑科学—桥梁与隧道工程] U441.4[交通运输工程—道路与铁道工程]