Identification Method of Bearing Separation of Curved Girder Bridge Based on Statistics Indicator

被引：0
|
作者：
Zhu J. [1 ,2 ]
Lu J. [1 ]
Yang X. [3 ]
机构：
[1] State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin
[2] Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin
[3] Hebei Xiong'an Rongwu Expressway Co., Ltd., Baoding
来源：
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | 2024年 / 44卷 / 02期
关键词：
bearing separation; damage identification; time history statistics indicator; vehicle-bridge coupling model;
D O I：
10.16450/j.cnki.issn.1004-6801.2024.02.003
中图分类号：
学科分类号：
摘要：
In order to quickly assess the health status of curved continuous girder bridge bearings, a method for identifying bridge bearing separation is proposed based on time-history statistical indicators. Firstly, the 20 time-history statistical indicators of the acceleration signal of the bridge deck measurement point under driving excitation are extracted. Using probability statistics, the confidence interval for each statistical indicator is obtained. Then, the entropy method is used to determine the weight distribution value of each statistical index, according to the different sensitivity of each time-history statistical index to the bearing separation. Finally, the damage index is calculated based on the number of abnormal indicators at each measuring point, and it is comprehensively judged whether the bearing separation near the measuring point. To verify the effectiveness of the method, a vehicle-bridge coupling dynamics model is established for analysis and verification using a 3×25 m curved continuous girder bridge as the engineering background. The results show that this method can accurately identify the location of the damaged bearing, and can effectively identify minor damage. Compared with the middle bearing damage, the time-history statistical indicators is more sensitive to the end bearing damage. © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.
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页码：225 / 231
页数：6
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