基于车激索力响应的斜拉桥主梁损伤识别研究  

Damage Detection of the Girder for Cable-stayed Bridge Based on Cable Force Response Excited by Vehicle

作　　者：李延强[1] 彭沉彬 

机构地区：[1]石家庄铁道大学工程力学系,河北石家庄050043

出　　处：《应用基础与工程科学学报》2017年第2期307-319,共13页Journal of Basic Science and Engineering

基　　金：河北省自然科学基金项目(E2016210066,E2012210061);河北省教育厅重点项目(ZH2012068);河北省科学技术研究与发展计划项目(11215611D);河北省人力资源和社会保障厅项目(436018)

摘　　要：基于车桥耦合振动理论,建立车桥索耦合振动方程,求解得到车激索力时程响应,其次定义主梁刚度折减系数为主梁损伤因子,根据泰勒级数展开方法建立索力响应与损伤因子的灵敏度方程,然后采用Tikhonov正则化方法和有限元模型修正技术求解该方程,得到主梁的损伤因子,从而实现对主梁的损伤识别.最后,以实验室独塔斜拉桥试验模型为例,对主梁单一位置损伤和多位置的损伤识别进行了数值仿真,并探讨了车辆参数、噪声干扰等对损伤识别结果的影响.结果表明:提出的识别方法理论正确,识别的结果可信,且该方法对车辆的参数、斜拉索的选择不敏感,可用不同参数车辆激励下的任意一根斜拉索的索力响应对斜拉桥主梁各种损伤位置和损伤程度进行有效识别.Based on the vehicle-bridge coupling vibration theory, the vibration equations of vehicle, cable-stayed bridge and cables were built up and the cable force responses were acquired by solving the vibration equation. The stiffness reduction in the main girder element was defined as damage damage factor. The factor. The was established by damage of the girder was simulated by means of changing the elemental sensitivity equation of cable force response and main girder＇ s the Taylor series expansion method. The sensitivity equation Tikhonov regularization method and finite element model updating technique. The damage factor was solved by damage factor was obtained and the damage of main girder was detected. Taking the test model of a single- tower cable-stayed bridge in laboratory for example, numerical simulation with single damage and multi-damage of the girder was studied and the effects of vehicle parameters and measurement noise on damage identification results were discussed. The results show that the presented method is correct, the identified results are creditable and it is insensitive to the vehicle parameters and the choice of the cables and damage location and damage degree of the main girders can be detected easily by using any cable force response excited by any vehicle.

关 键 词：斜拉桥 损伤识别 车致振动 索力响应 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]