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

卷:

38卷

期数:

2021年04期

页码:

73-79

栏目:

出版日期:

2021-07-15

文章信息/Info

Title:

Research on Deflection Evaluation Method of Continuous Girder Bridge Based on Environmental Excitation

文章编号:

1673-2049(2021)04-0073-07

作者:

亓兴军^1,2,孙绪法^1,2,赵 越^1,2,李洪印³,王珊珊³

(1. 山东建筑大学 交通工程学院,山东 济南 250101; 2. 山东建筑大学 山东省高校土木结构防灾减灾协同创新中心,山东 济南 250101; 3. 齐鲁交通发展集团有限公司,山东 济南 250101; )

Author(s):

QI Xing-jun^1,2, SUN Xu-fa^1,2, ZHAO Yue^1,2, LI Hong-yin³, WANG Shan-shan³

(1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Shandong Co-innovation Center for Disaster Prevention and Mitigation of Civil Structures, Jinan 250101, Shandong, China; 3. Qilu Transportation Development Group, Jinan 250101, Shandong, China)

关键词:

静载试验;  模态挠度;  柔度矩阵;  质量归一化振型;  随机子空间法

Keywords:

static load test;  modal deflection;  flexibility matrix;  mass-normalized modal shape;  SSI

分类号:

U447

DOI:

10.19815/j.jace.2020.08013

文献标志码:

A

摘要:

为研究基于环境激励的在役连续梁桥承载能力评定方法的可行性,根据《公路桥梁荷载试验规程》设计桥梁静载试验方案,利用随机子空间法测量识别桥梁在环境激励下的模态参数,结合桥梁有限元模型提取集中质量矩阵,对桥梁实测模态振型进行质量归一化,识别桥梁的实测位移柔度矩阵,预测桥梁在静力荷载作用下的实测模态挠度,最后结合规范对桥梁承载能力进行评定。以4跨连续梁桥为实例建立损伤桥梁有限元模型,基于有限元数值模拟环境激励,预测了该连续梁桥的柔度矩阵和试验荷载下的模态挠度,并与初始无损桥梁的理论设计挠度进行对比,计算了静载试验校验系数。结果表明:各测点挠度的最大相对误差不超过6%,基本满足工程精度要求,根据规范判断该损伤桥梁承载能力不满足设计要求; 该方法能够准确评估既有桥梁的承载能力,基于环境激励的连续梁桥承载能力评定方法具有较强的有效性和可行性。

Abstract:

In order to study the feasibility of deflection evaluation method of continuous beam bridge in service based on environmental excitation, the bridge static load test scheme was designed according to the Load Test Methods for Highway Bridge. The stochastic subspace identification(SSI)method was used to measure and identify the modal parameters of the bridge under environmental excitation. Combined with the bridge finite element model, the mass matrix was extracted, the measured modal shapes of the bridge were mass normalized.Then,the measured displacement compliance matrix of the bridge was identified, and the measured modal deflection of the bridge under static load was calculated.Finally, the bearing capacity of the bridge was evaluated according to the code. Taking a 4-span continuous beam bridge as an example, the finite element model of damaged bridge was established. Based on the environmental excitation of finite element numerical simulation, the flexibility matrix and modal deflection of the bridge under test load were predicted, and the calibration coefficient of static load test was calculated by comparing with the theoretical design deflection of the initial nondestructive bridge. The results show that the maximum deflection relative error of each measuring point is less than 6%, which basically meets the engineering precision requirements. According to the code, the bearing capacity of the damaged bridge beam does not meet the design requirements. The method can accurately evaluate the bearing capacity of existing bridges, and the evaluation method of bearing capacity of continuous beam bridges based on environmental excitation is effective and feasible.

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备注/Memo

备注/Memo:

收稿日期:2020-08-09
基金项目:山东省高等学校土木结构防灾减灾协同创新中心项目(XTM201904); 山东省交通运输厅科技计划项目(2020B69)
作者简介:亓兴军(1974-),男,山东济南人,教授,工学博士,E-mail:qxj123@163.com。

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更新日期/Last Update: 2021-07-10