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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年05期

页码:

129-137

栏目:

桥梁工程

出版日期:

2023-09-15

文章信息/Info

Title:

Experimental research on modal deflection prediction of simply supported girder bridge based on modal parameter identification

文章编号:

1673-2049(2023)05-0129-09

作者:

亓兴军¹,孙绪法¹,王珊珊²,曹三鹏¹

(1. 山东建筑大学 交通工程学院,山东 济南 250101; 2. 山东高速集团有限公司,山东 济南 250098)

Author(s):

QI Xingjun¹, SUN Xufa¹, WANG Shanshan², CAO Sanpeng¹

(1.School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Shandong Hi-speed Group Co.,Ltd., Jinan 250098, Shandong, China)

关键词:

简支梁桥;  模态挠度;  静载试验;  Kriging插值;  柔度矩阵

Keywords:

simply supported girder bridge;  modal deflection;  static load test;  Kriging interpolation;  flexibility matrix

分类号:

TU317

DOI:

10.19815/j.jace.2021.12031

文献标志码:

A

摘要:

以30 m跨径装配式简支T梁桥为研究对象,探究环境激励下预测桥梁模态挠度的准确性和模态测试法评估桥梁承载状况的可行性; 首先建立桥梁有限元模型,设计满足加载效率要求的桥梁静载试验方案,然后基于环境激励对简支T梁桥进行模态测试试验; 采用随机子空间方法识别获取桥梁结构模态参数,应用Kriging插值法对桥梁实测振型进行模态扩展,预测简支梁桥在静载试验车辆荷载作用下跨中截面的模态挠度,并将模态挠度与实测静挠度进行对比分析。结果表明:利用Kriging插值法获得的模态扩展振型可较为精确地预测桥梁的模态挠度,与实测静挠度相比,大效应主梁跨中截面的相对误差不超过10%,基本满足工程精度的要求; 基于环境激励模态参数识别预测的模态挠度可代替静载试验的实测静挠度,结合规范可评估桥梁的实际刚度状态; 仅利用简支梁桥前3阶模态参数即可获得较为精确的跨中截面模态挠度; 结合了静载试验和动载试验的优点,模态测试获得的桥梁模态挠度可用于宽简支梁桥刚度的快速评估,具有较好的准确性和工程可行性。

Abstract:

Taking a 30 m span prefabricated simply supported T-beam bridge as the research object, the accuracy of predicting bridge modal deflection under environmental excitation and the feasibility of evaluating bridge bearing capacity using modal testing method were studied. Firstly, the finite element model of the bridge was established, a static load test plan that met the loading efficiency requirements was designed, and then the modal testing tests on a simply supported T-beam bridge based on environmental excitation was conduced. The random subspace method was used to identify and obtain the modal parameters of the bridge structure, and the Kriging interpolation method was applied to expand the modal of the measured vibration modes of the bridge.The modal deflection of the mid-span section of a simply supported girder bridge under static test vehicle load was predicted, and the modal deflection was compared and analyzed with the measured static deflection. The results show that the modal expansion mode obtained by Kriging interpolation method can accurately predict the modal deflection of bridges. Compared with the measured static deflection, the relative error of the mid-span section of the large effect main beam does not exceed 10%, which basically meets the requirements of engineering accuracy. The modal deflection predicted based on environmental excitation modal parameter identification can replace the measured static deflection in static load tests, and then evaluate the actual stiffness state of bridges in combination with specifications. Accurate mid-span modal deflection can be obtained by only using the first three modal parameters of a simply supported girder bridge. Combining the advantages of static and dynamic load tests, the modal deflection obtained from modal testing can be used for rapid evaluation of the stiffness of wide simply supported girder bridges, with good accuracy and engineering feasibility.

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相似文献/References:

[1]李加武,周 琴,黄森华.简支梁桥铅芯橡胶支座减震特性研究[J].建筑科学与工程学报,2014,31(03):124.
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[2]董桔灿,陈宝春,BRISEGHELLA Bruno,等.多跨空心板简支梁桥整体化改造设计[J].建筑科学与工程学报,2015,32(05):73.
　DONG Ju-can,CHEN Bao-chun,BRISEGHELLA Bruno,et al.Integral Transformation Design of Multi-span Hollow Slab Simply-supported Bridge[J].Journal of Architecture and Civil Engineering,2015,32(05):73.
[3]亓兴军,孙绪法,赵 越,等.基于环境激励的连续梁桥挠度评定方法研究[J].建筑科学与工程学报,2021,38(04):73.[doi:10.19815/j.jace.2020.08013]
　QI Xing-jun,SUN Xu-fa,ZHAO Yue,et al.Research on Deflection Evaluation Method of Continuous Girder Bridge Based on Environmental Excitation[J].Journal of Architecture and Civil Engineering,2021,38(05):73.[doi:10.19815/j.jace.2020.08013]
[4]亓兴军,亓 圣,孙绪法,等.基于模态测试和等效荷载的装配式简支梁桥刚度快速评估[J].建筑科学与工程学报,2023,40(04):117.[doi:10.19815/j.jace.2021.08034]
　QI Xingjun,QI Sheng,SUN Xufa,et al.Rapid stiffness evaluation of prefabricated simply supported beam bridge based on modal test and equivalent load[J].Journal of Architecture and Civil Engineering,2023,40(05):117.[doi:10.19815/j.jace.2021.08034]

备注/Memo

备注/Memo:

收稿日期:2021-12-10
基金项目:山东省交通运输厅科技计划项目(2020B69); 山东省高等学校土木结构防灾减灾协同创新中心项目(XTM201904)
作者简介:亓兴军(1974-),男,工学博士,教授,硕士生导师,E-mail:qxj123@163.com。

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更新日期/Last Update: 2023-09-01