铰接车辆模型识别粗糙桥梁频率和振型的数值分析  

Numerical Analysis of Identifying Frequency and Vibration Mode of Rough Bridge by Articulated Vehicle Model

作　　者：张文武 亓兴军 肖志全 亓圣 王珊珊 ZHANG Wen-wu;QI Xing-jun;XIAO Zhi-quan;QI Sheng;WANG Shan-shan(Shandong Hi-speed Group Co.,Ltd.,Jinan 250098,Shandong,China;School of Transportation Engineering,Shandong Jianzhu University,Jinan 250101,Shandong,China)

机构地区：[1]山东高速集团有限公司,山东济南250098 [2]山东建筑大学交通工程学院,山东济南250101

出　　处：《建筑科学与工程学报》2022年第2期119-127,共9页Journal of Architecture and Civil Engineering

基　　金：山东省交通运输厅科技计划项目(2020B69);山东省高等学校土木结构防灾减灾协同创新中心项目(XTM201904)。

摘　　要：根据车桥耦合振动理论和桥梁间接测量法基本原理,对实际工程某连续梁桥建立桥梁模型,采用2辆单轴1/4车辆模型模拟测量车辆,1辆双轴半车模型模拟牵引车辆提供额外桥梁激励,三车前后铰接建立车辆模型。基于分离法原理与车辆动力学理论,利用约束方程实现任意时刻车轮与桥面接触点的位移协调关系,采用APDL编程实现铰接车辆过桥的耦合动力时程响应分析。提取前后测试车辆匀速通过不同等级粗糙桥面时车辆振动加速度时程响应,对通过桥梁同一位置处的前后测试车辆加速度数值进行相减处理并应用快速傅里叶变换识别桥梁频率。采用带通滤波技术与汉宁窗相结合的处理方法提取分离出与桥梁固有频率相关的桥频分量响应,利用桥频分量响应及其希尔伯特变换构造出与每阶固有频率相对应的振型。结果表明:在A、B、C级桥面不平整度条件下,采用铰接车辆模型识别出的桥梁前3阶频率相对误差均在1%以内;对加速度时程响应数据加窗处理后识别出的桥梁前3阶振型MAC值均在0.95以上,满足工程精度需求;研究结果可以为移动传感间接测量方法在桥梁检测工程中的应用提供理论参考。According to the vehicle bridge coupling vibration theory and the basic principle of bridge indirect measurement method,a bridge model of a continuous beam bridge in practical engineering was established.Two single-axle 1/4 vehicle models were used to simulate the measurement vehicle,and one two-axle half-vehicle model was used to simulate the traction vehicle to provide additional bridge excitation.Three vehicles were hinged at the front and rear to establish the vehicle model.Based on the principle of separation method and vehicle dynamics theory,the displacement coordination relationship between wheel and bridge deck contact point at any time was realized by using constraint equation.The coupling dynamic time history response analysis of articulated vehicle crossing the bridge was realized by APDL programming.The time history response of vehicle vibration acceleration when the front and rear test vehicles passed through different levels of rough bridge deck at a uniform speed was extracted.The acceleration values of the front and rear test vehicles passing through the same position of the bridge were subtracted,and the bridge frequency was identified by fast Fourier transform.The bridge frequency component response related to the bridge natural frequency was extracted and separated by the combination of band-pass filtering technology and Hanning window.The vibration mode corresponding to each natural frequency was constructed by using the bridge frequency component response and its Hilbert transform.The results show that under the condition of class A,B and C deck roughness,the first three frequency errors of the bridge identified by the articulated vehicle model are all within 1%.After windowing the acceleration time history response data,the MAC values of the first three vibration modes of the bridge identified are more than 0.95,meeting the engineering accuracy requirements.The research results can provide a theoretical reference for the application of mobile sensor indirect measurement method in bridge det

关 键 词：桥梁 频率 振型 桥梁间接测量法 铰接车辆模型 

分 类 号：TU375[建筑科学—结构工程]