基于模态应变能变化率的公路架桥机主梁结构损伤识别研究  

Research on Damage Identification of Main Beam Structure of Highway Bridge Erection Machine Based on Change of Modal Strain Energy

作　　者：韩洪举 姜远坤 郭吉平 陶铁军 胡嫚[3] 赵疆 巨泽港 吴飞[4] Han Hongju;Jiang Yuankun;Guo Jiping;Tao Tiejun;Hu Man;Zhao Jiang;Ju Zegang;Wu Fei(Guizhou Road&Bridge Group Co.,Ltd.,Guiyang 550001,China;College of Civil Engineering,Guizhou University,Guiyang 550025,China;College of Engineering and Technology,Southwest University,Chongqing 400715,China;College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]贵州路桥集团有限公司,贵阳550001 [2]贵州大学土木工程学院,贵阳550025 [3]西南大学工程技术学院,重庆400715 [4]重庆大学机械与运载工程学院,重庆400044

出　　处：《科技通报》2023年第7期92-98,共7页Bulletin of Science and Technology

基　　金：贵州省科技厅科技支撑计划项目(黔科合支撑[2021]一般341)。

摘　　要：针对公路架桥机主梁在各种损伤条件下的损伤识别研究问题,本文以JQG160t-40m公路架桥机主梁为研究对象,基于应变模态分析理论,推导了三角桁架公路架桥机主梁结构单元模态应变能变化率的计算模型。通过在有限元软件ABAQUS建立公路架桥机的主梁模型,提取该架桥机主梁结构在12种工况下各单元的模态参数,利用Matlab计算每个单元的模态应变能变化率。结果表明:以单元模态应变能变化率作为损伤识别量,可对架桥机主梁结构的不同损伤位置和程度进行损伤识别。本方法对公路架桥机主梁结构损伤位置和损伤程度的评估是准确有效的,可以作为三角桁架类架桥机主梁结构进一步研究和定期检测的方法。Aiming at the research problem of damage identification of the main girder of highway bridge erecting machine under various damage conditions,this paper takes the main girder of JQG160t-40m highway bridge erecting machine as the research object,and deduces the triangular truss highway bridge construction based on the theory of strain modal analysis.Calculation model for the rate of change of modal strain energy of main beam structural elements.By establishing the main beam model of the highway bridge erecting machine in the finite element software ABAQUS,the modal parameters of each element of the main girder structure of the bridge erecting machine under 12 working conditions are calculated,and the modal parameters of each element are analyzed and calculated by Matlab rate of change of strain energy.The results in this paper show that the change rate of element modal strain energy is used as the damage identification quantity,and the damage identification of different damage positions and degrees of the main girder structure of the bridge erection machine can be carried out.The assessment of the damage position and damage degree of the main girder structure of the highway bridge erecting machine is accurate and effective,and can be used as a method for further research and regular inspection of the main girder structure of the triangular truss bridge erecting machine.

关 键 词：公路架桥机 主梁结构 损伤识别 模态应变能变化率 

分 类 号：U445.36[建筑科学—桥梁与隧道工程]