摘要
桥梁是公路交通运输网络的重要组成部分。桥梁在使用过程中会出现不同程度的损坏与老化,因此需要定期评估桥梁的健康状态以保证桥梁的安全运营。除了桥梁的模态参数之外,桥梁的影响线也是评价桥梁健康状态的重要指标,在实际工程中得到了广泛的应用。传统方法大多直接从检测车辆过桥时桥梁产生的位移或应变中提取影响线,因此需要在桥梁上布置位移或应变传感器,并在检测车辆测量时限制交通。该文研究了重载车辆与桥梁的耦合作用,利用频率调制技术推导了重载车辆过桥动力学响应的解析解,提出了基于加权多项式调频小波变换的桥梁影响线识别方法,并分别利用数值模拟与缩尺试验对该方法进行了验证。该方法利用重载车辆过桥的竖向加速度而非桥梁的动态位移来提取桥梁影响线,是一种典型的间接测量方法,具有操作简单、现场测量方便的优点。数值模拟的结果表明:得到的重载车辆与桥梁动力学响应的解析解比将重载车辆简化为移动力的经典解析解更加准确,能够更好地反映重载车辆在桥梁不同位置时车桥耦合系统频率变化的特征,利用该方法提取出的桥梁位移影响线与基准影响线吻合良好。缩尺试验的结果表明,该方法在重载车辆不同行驶速度与不同车重的情况下均能准确地识别出桥梁位移影响线。
Bridges play a crucial role in transportation systems.Therefore,it is necessary to evaluate the health conditions of bridges owing to damage and deterioration during long-term operation.In addition to bridge modal parameters,the influence line of a bridge is required for bridge condition evaluation.Bridge displacement or strain induced by a moving inspection vehicle is typically adopted in conventional methods to extract the influence line of a bridge;hence,sensors should be installed on the bridge,and traffic should be blocked during measurements.In this study,the coupling effect of heavy vehicles and bridges was investigated to derive the dynamic response of a heavy vehicle passing over a bridge.Moreover,a method for identifying the bridge influence line based on a weighted polynomial chirp-let transform was proposed,which was verified using numerical simulations and experiments.The proposed method uses the vertical acceleration of a passing heavy vehicle instead of the displacement of the bridge to extract the influence line of the bridge;therefore,it is a typical indirect method that can be easily implemented in practical applications.The numerical simulation results show that the analytical solution of the dynamic responses of the bridge and vehicle obtained in this study is more accurate than the classical solution in which the coupling effect of the vehicle and bridge is ignored.The passing vehicle is simplified as a moving constant load,and the bridge influence lines can be identified accurately using the proposed method.The experimental results show that the proposed method performs satisfactorily at different driving speeds and vehicle masses.
作者
陈志为
肖钧垚
任伟新
张尧
CHEN Zhi-wei;XIAO Jun-yao;REN Wei-xin;ZHANG Yao(School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,Fujian,China;Fujian Key Laboratory of Digital Simulations for Coastal Civil Engineering,Xiamen University,Xiamen 361005,Fujian,China;College of Civil and Transportation Engineering.Shenzhen University,Shenzhen 518061,Guangdong,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2024年第8期77-87,共11页
China Journal of Highway and Transport
基金
国家自然科学基金项目(52278319)
中央高校基本科研业务费专项资金项目(20720220070)
关键词
桥梁工程
车桥耦合
间接测量方法
桥梁影响线
频率调制
bridge engineering
vehicle-bridge interaction
indirect method
bridge influence line
frequency modulation
