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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04期

页码:

117-124

栏目:

桥梁工程

出版日期:

2023-07-10

文章信息/Info

Title:

Rapid stiffness evaluation of prefabricated simply supported beam bridge based on modal test and equivalent load

文章编号:

1673-2049(2023)04-0117-08

作者:

亓兴军¹,亓 圣¹,孙绪法¹,王珊珊²

(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, QI Sheng¹, SUN Xufa¹, WANG Shanshan²

(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;  刚度;  快速评估;  等效荷载;  模态挠度

Keywords:

simply supported beam bridge;  stiffness;  rapid evaluation;  equivalent load;  modal deflection

分类号:

TU311

DOI:

10.19815/j.jace.2021.08034

文献标志码:

A

摘要:

把不中断交通的模态测试方法和传统可靠的静力荷载试验方法相结合,提出了装配式简支梁桥刚度快速评估的等效荷载模态挠度测试方法; 以装配式简支空心板桥梁为研究对象,建立无损伤和有损伤状态的有限元模型,提取冲击激励下主梁指定测点的竖向加速度,识别桥梁结构的模态参数,预测主梁位移柔度矩阵; 根据《公路桥梁荷载试验规程》设计静力荷载试验的等效荷载,确定等效荷载作用下有损伤桥梁跨中的实测模态挠度; 根据有限元无损状态的理论挠度计算挠度校验系数,结合规范快速评估损伤桥梁的刚度状况,并通过对桥梁跨中模态挠度和理论挠度的偏差分析,探究了不同测点布置以及不同模态阶次对预测模态挠度的影响。结果表明:在冲击激励下,无论是采用跨中及四分之一跨共18个测点方案,还是仅跨中9个测点方案,都能够准确识别到桥梁前3阶模态参数且预测的模态挠度偏差均低于5%,满足工程精度的要求; 采用前3阶模态参数与采用前4阶模态参数预测的跨中模态挠度相同,即简支梁第2个纵向竖弯振型对跨中模态挠度的预测没有贡献; 从振动理论和测试方法上验证了基于模态测试和等效荷载可以实现简支梁刚度的快速评估,具有较好的实际工程应用价值。

Abstract:

Combining the modal test method without interrupting traffic with traditional reliable static load test methods, an equivalent load modal deflection test method for rapid stiffness evaluation of prefabricated simply supported beam bridges was proposed. Taking prefabricated simply supported hollow slab bridges as the research object, finite element models for undamaged and damaged states were established. The vertical acceleration of the designated measurement point of the main beam under impact excitation was extracted, the modal parameters of the bridge structure was identified and the displacement flexibility matrix of the main beam was predicted. According to Load Test Methods for Highway Bridge, the equivalent load for static load test was designed, and the measured modal deflection of the damaged bridge midspan under the equivalent load was determined. The deflection calibration coefficient was calculated based on the theoretical deflection of the finite element undamaged state, and the stiffness of the damaged bridge was quickly evaluated in combination with the specifications. Through the error analysis of the mid-span modal deflection and theoretical deflection of the bridge, the influence of different measurement point arrangements and different modal orders on the predicted modal deflection was explored. The results show that under impact excitation, whether using a total of 18 measurement points in the midspan and quarter span scheme or only 9 measurement points in the midspan scheme, the first three modal parameters of the bridge can be accurately identified and the predicted modal deflection error is less than 5%, meeting the requirements of engineering accuracy. Using the first three modal parameters is the same as using the first four modal parameters to predict the midspan modal deflection, that is, the second longitudinal vertical bending mode of a simply supported beam does not contribute to the prediction of midspan modal deflection. From the perspective of vibration theory and testing methods, it is demonstrated that rapid stiffness evaluation of simply supported beams can be achieved based on modal testing and equivalent loads, which has good practical engineering application value.

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备注/Memo

备注/Memo:

收稿日期:2021-08-11
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: 2023-07-01