人行悬索桥吊杆的损伤识别  

Damage Identification of the Suspenders in Pedestrian Suspension Bridge

作　　者：张彦玲[1,2] 侯屹峰 王泽涵 曹杨 Zhang Yanling;Hou Yifeng;Wang Zehan;Cao Yang(Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第2期1-9,共9页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51778377,51908382);河北省自然科学基金(E2019210311)。

摘　　要：悬索桥中的吊杆会由于锈蚀和疲劳等原因发生损伤,影响桥梁的使用甚至安全性能,应及时对其进行损伤识别。以人行悬索桥为研究对象,分析了吊杆损伤和断裂对桥梁受力性能的影响,并研究了模态曲率及其变化因子对吊杆损伤识别的适用性。研究结果表明,吊杆损伤对其索力的影响很小,但会使损伤吊杆本身应力增大;吊杆断裂对其相邻吊杆的应力影响最大,在该吊杆位置使主梁位移、弯矩和主缆轴力发生较大变化。模态曲率差对人行悬索桥的吊杆损伤敏感,对其进行多阶融合后得到的损伤因子DF及其归一化参数DDF可对单根吊杆损伤时位置进行有效识别;多根吊杆同时发生损伤时,可根据DF值分层次进行有效识别,但对跨中区域的短吊杆效果一般。对于确定损伤吊杆的位置和损伤程度均具有较好的准确度。The suspenders in suspension bridges would be damaged due to corrosion and fatigue,which might affect the use and even safety performance of the bridge.Therefore,the damage identification should be carried out in time.Taking the pedestrian suspension bridge as the research object,the influence of the damage and fracture of suspenders on the mechanical performance of the bridge was analyzed in this paper,and the applicability of the modal curvature and corresponding calculating factors to the damage identification for suspenders was studied.The results show that the damage of suspender has little influence on its cable force,but it will increase the stress of itself.The fracture of a suspender has the greatest impact on the stress of its adjacent suspender.The displacement,bending moment and main cable axial force of the main girder change greatly at the position of the damaged suspender.The modal curvature difference is sensitive to the suspender damage of pedestrian suspension bridge.The damage factor DF and its normalized parameter DDF can effectively identify the damaged suspender position when a single suspender is damaged.When multiple suspenders are damaged at the same time,they can be effectively identified by levels according to DF value,but the effect on short suspenders in mid span area is general.This method has good accuracy for the position and degree of damage of the damaged suspender.

关 键 词：人行悬索桥 吊杆 损伤识别 模态曲率差 损伤因子 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]