基于车桥耦合理论的梁式桥阻尼比识别研究  

RESEARCH ON DAMPING RATIO IDENTIFICATION OF BEAM BRIDGE BASED ON VEHICLE BRIDGE COUPLING THEORY

作　　者：阳洋[1,2] 许文明 卢会城 袁爱鹏 谭小琨 毕和生 方光俊 唐艳 Yang Yang;Xu Wenming;Lu Huicheng;Yuan Aipeng;Tan Xiaokun;Bi Hesheng;Fang Guangjun;Tang Yan(Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,Chongqing 400030,China;School of Civil Engineering,Chongqing University,Chongqing 400030,China;Power China Chongqing Engineering Corporation Limited,Chongqing 400060,China;Chongqing High-Tech Development and Construction Investment Group Co.,Ltd.,Chongqing 400039,China)

机构地区：[1]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400030 [2]重庆大学土木工程学院,重庆400030 [3]中国电建集团重庆工程有限公司,重庆400060 [4]重庆高新开发建设投资集团有限公司,重庆400039

出　　处：《力学学报》2022年第5期1387-1402,共16页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家重点研发计划(2020YFF0217802);重庆市科技局技术创新与应用发展专项(cstc2020jscx-msxm0907);重庆市研究生科研创新项目(CYS20022,CYS19004);中国电力建设股份有限公司科技项目(KJ-2020-117);重庆高新区科技创新局揭榜挂帅项目资助。

摘　　要：提出一种基于车桥耦合动力学理论的梁式桥阻尼比识别方法.首先按照动力学理论将测试车设计为单自由度体系,然后利用安装在测试车上的传感器采集信号,从测试车与桥梁接触点响应信号中得到梁式桥响应的信号,基于车桥耦合动力学原理滤波处理得到包含梁式桥第一阶频率的信号,最后假定梁式桥阻尼比值,通过假定的梁式桥阻尼比值获取假定的梁式桥第一阶振型,不断循环直至假定的阻尼比值下计算的第一阶振型最大值点居中,即为识别的梁式桥真实阻尼比.本文首先从车桥耦合动力学理论推导上说明了该方法的可行性,然后考虑在不同车速与非恒定车速、路面粗糙度、环境噪音等影响因素下进行车桥耦合动力学模型分析,最后通过实桥试验进行了初步验证.研究结果表明:该方法能一定程度上克服外界不利因素的影响,达到识别梁式桥阻尼比的目的,为识别梁式桥阻尼比提供一种更优方法,其具有参数设置较少、操作简单方便以及更高测试精度等优点,同时有助于推动基于车桥耦合的车桥耦合动力学理论技术在梁式桥模态参数识别工作中的实际工程应用.A damping ratio identification method of the simply supported beam based on the vehicle bridge coupling dynamics theory is proposed.Firstly,the test vehicle is designed as a single degree of freedom system according to the dynamic theory,and then the signal of the simply supported beam bridge response is obtained from the response signal of the contact point between the test vehicle and the simply supported bridge by using the sensor installed on the test vehicle.The signal including the first-order frequency of the simply supported beam bridge is filtered based on the principle of vehicle bridge coupling dynamics.Finally,the damping ratio of the simply supported beam bridge is assumed,The assumed first-order vibration mode of the simply supported beam bridge is obtained through the assumed damping ratio of the simply supported beam bridge,and the cycle is continued until the maximum value point of the firstorder vibration mode calculated under the assumed damping ratio is in the middle,that is the identified real damping ratio of the simply supported beam bridge.This paper first explains the feasibility of this method from the theoretical derivation of vehicle bridge coupling dynamics,and then analyzes the vehicle bridge coupling dynamics model under the influence of different vehicle speed and unsteady vehicle speed,road roughness,environmental noise and other factors.Finally,it is preliminarily verified by real bridge test.The results show that this method can overcome the influence of external adverse factors to a certain extent,achieve the purpose of identifying the damping ratio of beam bridge,and provide a better method for identifying the damping ratio of simply supported beam bridge.It has the advantages of less parameter setting,simple and convenient operation and higher test accuracy,At the same time,it is helpful to promote the practical engineering application of the vehicle bridge coupling dynamics theory and technology based on vehicle bridge coupling in beam bridge modal parameter identification.

关 键 词：车桥耦合动力学理论 梁式桥阻尼比 第一阶振型 

分 类 号：U44[建筑科学—桥梁与隧道工程]