简支梁桥模态试验测点布置方式研究

Research on Measuring Point Arrangement for Modal Testing of Simply Supported Girder Bridges

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摘要《公路桥梁荷载试验规程》仅规定了桥梁模态试验时最少测点布置方式,导致模态试验数据在桥梁运维中利用率不高.为了揭示桥梁损伤与模态试验数据间的关系,基于结构动力学和损伤力学基本理论,以简支梁桥为研究对象,构建模态柔度曲率、模态柔度差曲率、模态柔度曲率差及模态柔度均值曲率差改变率等基于模态柔度矩阵的损伤识别指标,在此基础上对模态试验时拾震器的布设方式及模态数据的阶数对识别效果的影响进行研究.结果表明:模态试验时按主梁16等分布设拾振器得到的模态数据能较好完成结构的损伤识别;识别指标宜采用模态柔度曲率差;高阶模态的测试数据对损伤识别影响不明显,简支梁桥利用一阶模态试验数据构件的识别指标就能较好识别出结构的损伤. The Load Test Methods for Highway Bridge only stipulates the minimum measurement point arrangement during modal testing of the bridge,which will lead to the underutilization of modal test data in the operation and maintenance of bridges.In order to reveal the relationship between bridge damage and modal test data,based on the basic theories of structural dynamics and damage mechanics,this study takes simply supported beam bridges as the research object and constructs damage identification indexes based on modal flexibility matrix,such as modal flexibility curvature,modal flexibility difference curvature,modal flexibility curvature difference and modal flexibility mean curvature difference rate of change.On this basis,the layout of the vibration pickup during the modal test and the order of the modal data on the identification effect are studied.The results show that:during the modal test,the modal data obtained by the vibration pickups arranged according to the main beam 16 equal distribution can better complete the damage identification of the structure;the modal flexibility curvature difference should be used as the identification index;the impact of higher order modal data on the damage identification is not obvious.The structural damage can be well identified by using the identification index of the first order modal test data components for the simply supported girder bridges.

作者付书林唐柱强马艺宁王羽豪王光辉 FU Shuin;TANG Zhuqiang;MA Yining;WANG Yuhao;WANG Guanghui(Anhui Qixing Engineering Testing Co.,Ltd.,Hefei 230088,China;Yueyang Tongxiang Transportation Infrastructure Engineering Testing Co.,Ltd.,Yueyang 414000,China;School of Civil Engineering and Architecture,Hunan Institute of Science and Technology,Yueyang 414006,China)

机构地区安徽省七星工程测试有限公司岳阳通湘交通基建工程检测有限公司湖南理工学院土木建筑工程学院

出处《湖南理工学院学报（自然科学版）》 CAS 2024年第2期41-47,共7页 Journal of Hunan Institute of Science and Technology(Natural Sciences)

基金湖南省自然科学基金项目(2024JJ7214)。

关键词损伤识别模态试验测点布置 damage identification modal test measuring point arrangement

分类号 U446.1 [建筑科学—桥梁与隧道工程]