基于车辆响应的连续梁桥损伤识别数值分析  

Numerical analysis of damage identification of continuous beam bridge based on vehicle response

作　　者：李祖栋 项长生[1] 亓兴军 杨洪超 LI Zudong;XIANG Changsheng;QI Xingjun;YANG Hongchao(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Traffic Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]山东建筑大学交通工程学院,山东济南250101

出　　处：《地震工程与工程振动》2023年第2期202-211,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51868045);山东省交通运输厅科技计划项目(2020B69)。

摘　　要：采用有限元模拟动力计算方法,将过桥车辆振动响应中的驱车频率分量响应提取出来,对其进行希尔伯特变换,进而得到瞬时振幅平方(IAS)信息;通过IAS识别图的峰值判断桥梁裂缝损伤的位置。根据上述原理对两跨连续梁桥建立车桥耦合振动模型,分析车速、车辆阻尼比、车辆轴数、桥面粗糙度对损伤识别的影响,对比了单轴车辆模型与双轴车辆模型损伤识别结果的异同。结果表明:损伤识别精度随着车速的增加变差,在车速合适的范围内,匀速或者变速均可准确地识别损伤位置;车辆阻尼比对损伤识别结果无影响;桥梁损伤程度越大,损伤处的IAS峰值越高;IAS方法对于桥梁多损伤仍能较为准确地识别;桥面粗糙度的加入使损伤识别更加困难,通过适当增大测量车的车重,能够成功识别A级桥面粗糙度的桥梁损伤位置;对比单轴车与双轴车,双轴车采集到的振动信号更丰富,二者均可用于识别连续梁桥损伤。Using the finite element simulation dynamic calculation method,the driving frequency component response in the vibration response of the vehicle crossing the bridge is extracted,and the Hilbert transform is performed on it,then the instantaneous amplitude square(IAS)information is obtained.The location of bridge crack damage is judged by the peak value of the IAS identification graph.According to the above principles,a vehicle-bridge coupled vibration model is established for a two-span continuous beam bridge,and the influence of vehicle speed,vehicle damping ratio,vehicle axle number,and bridge deck roughness on damage identification was analyzed.The similarities and differences of damage identification results between the single-axle vehicle model and the two-axle vehicle model were compared.The results show that the damage identification accuracy deteriorates with the increase of vehicle speed,and within the appropriate range of vehicle speed,the damage location can be accurately identified at constant speed or variable speed.The vehicle damping ratio has no effect on the damage identification results,the greater the damage degree of the bridge,the higher the IAS peak value at the damage location.The IAS method can still identify the bridge with multiple damages accurately,the addition of the bridge deck roughness makes the damage identification more difficult.By appropriately increasing the weight of the measuring vehicle,the bridge damage location of the A-level deck roughness can be successfully identified;Compared with single-axle vehicle and two-axle vehicle,vibration signals collected by two-axle vehicle are more abundant,and both of them can be used to identify continuous beam bridge damage.

关 键 词：车辆振动 瞬时振幅平方信息 损伤识别 双轴车 驱车频率 

分 类 号：U446[建筑科学—桥梁与隧道工程]