Damage detection and tests for a RC simply supported girder bridge based on its damping characteristics

被引：0
|
作者：
Chen Y. [1 ]
Qian Y. [1 ]
Li H. [1 ]
He H. [1 ,2 ]
Yan W. [1 ,2 ]
机构：
[1] Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing
[2] Beijing Collaborative Innovation Center for Metropolitan Transportation, Beijing
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2017年 / 36卷 / 13期
关键词：
Crack; Damage detection; Damping ratio; Free vibration; Reinforced concrete (RC) bridge;
D O I：
10.13465/j.cnki.jvs.2017.13.033
中图分类号：
学科分类号：
摘要：
Damage detection methods based on natural frequencies, vibration modal shapes and other basic dynamic parameters are deficient, their accuracy and applicability should be improved. Here, damping ratio was proposed as an indicator for damage detection to explore the relationship between damping and structural damage. The relationships among damping, number and width of structural cracks and damage evolution were described theoretically. Through a simply supported T beam bridge test, the free vibration method was used to calculate the bridge system's damping ratios. The system's damping ratios under different damage levels were obtained. The results showed that the system's damping ratios firstly increase and then decrease with increase in damage levels; the difference between damping ratios corresponding to positive displacement and negative one, respectively has the same evolution law; the location with a larger changing rate of damping ratio may have a more serious damage, so the changing rate of damping ratio can be used to realize locating basic damages; compared with natural frequencies and vibration modal shapes of bridges, damping ratios are more sensitive and vivid, so they can be taken as indicators of damage detection for RC bridges, and their changing inflection points can be taken as early warning thresholds of structural reinforcement and maintenance. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：208 / 213and257
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