基于车激索力响应的斜拉桥主梁损伤识别研究

发布时间：2018-04-17 00:20

本文选题：斜拉桥 + 损伤识别　；参考：《应用基础与工程科学学报》2017年02期

【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.
[Abstract]:Based on the theory of vehicle-bridge coupling vibration, the bridge cable coupling vibration equation is established, and the time-history response of the vehicle-induced cable force is obtained. Secondly, the stiffness reduction coefficient of the main beam is defined as the main beam damage factor.According to the Taylor series expansion method, the sensitivity equations of cable force response and damage factor are established, and then the Tikhonov regularization method and the finite element model correction technique are used to solve the equation. The damage factor of the main beam is obtained and the damage identification of the main beam is realized.Finally, taking the experimental model of single-tower cable-stayed bridge in laboratory as an example, numerical simulation of single position damage and multi-position damage identification of main girder is carried out, and the effects of vehicle parameters and noise interference on damage identification results are discussed.The results show that the theory of the method is correct, the result of recognition is reliable, and the method is not sensitive to the selection of vehicle parameters and stay cables.All kinds of damage positions and damage degree of the main girder of cable-stayed bridge can be effectively identified by the cable force response of any cable under the excitation of a vehicle with different parameters.
【作者单位】：石家庄铁道大学工程力学系;
【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)
【分类号】：U446;U448.27

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