摘要
为了实现对大规模中小跨径桥梁群体的快速检测,提出了一种参数可调的移动检测车辆,并通过理论推导、试验验证和参数分析对车辆参数的合理取值进行研究.首先,通过车-桥耦合振动理论推导出“拖车-双挂车”过桥振动响应的解析解;其次,利用有限元模型和车桥耦合计算程序的数值计算结果,以及一座简支梁桥的现场试验结果对理论解析解进行验证;最后,基于推导的理论解析解进行参数研究,分析了检测车辆的动力参数、车速以及桥梁参数对间接法识别精度的影响.结果表明:当车桥频率比在0.8~0.9(或1.1~1.2)之间变化时,桥梁频率识别效果较好;在利用间接法进行桥梁频率识别时,建议移动检测车辆的车速不宜取太大;根据桥梁的截面面积、截面形状和跨度对检测车辆参数进行合理的选取,可提高桥梁频率识别的准确性.研究结果可为基于车辆响应的桥梁频率间接识别提供参考.
To realize the rapid inspection of a large amount of small and medium-span bridges,a modal identification method based on the response of moving vehicles is studied.And a moving inspection vehicle with adjustable parameters is proposed.The vehicle parameters are optimized by theoretical derivation,experimental verification,and parameter research.Firstly,an analytical solution of the dynamic response of the specially designed“tractor-double-trailer”vehicle moving along the bridge is derived based on the vehicle-bridge coupled vibration theory.Then,the analytical solution is verified by the numerical results using a self-developed vehiclebridge coupled analysis program,as well as the field test results of a simply supported beam bridge.Finally,the influence of various factors,such as vehicle parameters,vehicle speed,and bridge parameters,on the identification accuracy is analyzed using the analytical solution.The results show that when the natural frequency of the trailer is 0.8~0.9(or 1.1~1.2)times the bridge frequency,the performance of the bridge frequency identification using the proposed method is better.It is suggested that the speed of the moving vehicle should not be taken too high.Based on different cross-section areas,cross-section shapes,and spans of the bridge,a reasonable selection of vehicle parameters can improve the accuracy of bridge modal identification.The findings of this paper can provide a good reference for bridge frequency identification using the moving vehicle in practice.
作者
孔烜
李思琪
韩振勇
殷鹏程
罗奎
王秀艳
KONG Xuan;LI Siqi;HAN Zhenyong;YIN Pengcheng;LUO Kui;WANG Xiuyan(College of Civil Engineering,Hunan University,Changsha 410082,China;China Railway Siyuan Survey and Design Group Co.,Wuhan 430063,China;Tianjin Urban Construction Design Institute Ltd,Tianjin 300122,China;China Construction Sixth Engineering Bureau Corp,Ltd,Tianjin 300171,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第7期12-22,共11页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52008160)
湖南省优秀青年基金项目(2021JJ20015)。
关键词
移动检测车辆
车辆振动响应
车-桥耦合振动
时域差值法
桥梁频率
参数分析
moving inspection vehicle
vehicle vibration response
vehicle-bridge coupled vibration
timedomain subtraction method
bridge frequency
parameter analysis
