车桥耦合振动下损伤连续梁桥承载力评定方法研究  

Research on the Bearing Capacity Evaluation Method of Damaged Continuous Beam Bridge under Vehicle-Bridge Coupling Vibration

作　　者：亓兴军 佀贞贞 李淑堃 郭冬梅 Qi Xingjun;Si Zhenzhen;Li Shukun;Guo Dongmei(School of Transportation Engineering Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学交通工程学院,山东济南250101

出　　处：《华东交通大学学报》2024年第3期45-54,共10页Journal of East China Jiaotong University

基　　金：山东省交通运输厅科技计划项目(2022B06);山东省企业技术创新项目(202250101726,202160101415)。

摘　　要：【目的】桥梁的安全与承载能力至关重要,为简化试验流程、提高检测效率,以实际工程中一座两跨连续梁桥为研究背景,基于移动车辆进行轻荷载数值分析,探究车桥耦合振动下损伤桥梁承载力评定方法的准确性与可行性。【方法】建立车桥耦合振动模型,提取桥梁结构控制截面的挠度、应变动态时程响应,利用经验模态分解(EMD)和变分模态分解(VMD)去除动力成分并识别准静态响应曲线,分析桥面粗糙度和车速对准静态响应识别精度的影响;通过车辆行驶中控制截面产生的不同响应计算不同加载位置的加载效率,利用“常丁模型”计算轻荷载效率下损伤桥梁控制截面准静态响应的标准校验系数,对损伤连续梁桥的承载力进行评估。【结果】相较于EMD,VMD分解的准静态响应曲线与静态响应曲线吻合程度更好;随着桥面粗糙度、加载车辆移动速度的增大,识别的准静态响应与静态响应的误差也逐步增大;移动车辆加载过程中识别的准静态响应较为精确,可作为静载实测值进行计算;计算的标准校验系数均大于1,准确评估了桥梁的损伤状态。【结论】基于车桥耦合振动评估损伤桥梁承载力的方法具有较强的适用性和可行性。【Objective】In order to simplify the test process and improve the detection efficiency,a two-span continuous beam bridge in the actual project was taken as the research background,and the light load numerical analysis was carried out based on the moving vehicle,and the accuracy and feasibility of the evaluation method of the damaged bridge bearing capacity under vehicle-bridge coupling vibration were explored.【Method】The vehicle-bridge coupling vibration model was established,the deflection and strain dynamic time-history response of the control section of the bridge structure were extracted,the dynamic components were removed by empirical mode decomposition(EMD)and variational mode decomposition(VMD)and the quasi-static response curve was identified,and the influence of bridge deck roughness and vehicle speed on the accuracy of the static response recognition was analyzed.The loading efficiency of different loading positions was calculated by the different responses of the control section during vehicle driving,and the standard check coefficient of the quasi-static response of the control section of the damaged bridge under light load efficiency was calculated by using the“Changding model”, and the bearing capacity of the damaged continuous beam bridge was evaluated.【Result】Comparedwith EMD, the quasi-static response curve of VMD decomposition is in better agreement with the static responsecurve. With the increase of bridge deck roughness and the moving speed of the loading vehicle, the errorof the recognized quasi-static response and the static response also gradually increases. The quasi-static responseidentified during the loading process of the moving vehicle is relatively accurate and can be calculated as themeasured value of static load. The calculated standard check factors are all greater than 1, which accurately evaluatesthe damage state of the bridge.【Conclusion】It is highly applicable and feasible to evaluate the bearing capacityof damaged bridges based on vehicle-bridge coupling vi

关 键 词：车桥耦合 承载力评估 准静态响应 轻荷载 粗糙度 损伤 振动 连续梁桥 

分 类 号：U446[建筑科学—桥梁与隧道工程]