Damage identification of small radius curved bridge based on curvature of displacement influence line

doi:10.3785/j.issn.1008-973X.2016.04.018

JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)

Civil Engineering

Damage identification of small radius curved bridge based on curvature of displacement influence line

SUN Ke, ZHANG Yan qing

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

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Abstract

The vertical displacement influence line (DIL) of curved bridge at measuring point was measured in pseudo static state in order to obtain as much as possible comprehensive data and reduce the demand of initial data. Curvature was calculated by the second order difference of DIL. Then a damage index was defined based on the gapped smoothing method. The validity of the method was verified by the relevant numerical model with a three span small radius curved bridge as the background. The effects of the slow loading, bearing eccentricity, torsional bearing spacing and other factors on the damage identification were analyzed. Results show that for the small radius curved bridge, the method with less measuring points is suitable for multi damage identification that does not depend on the initial data. The damage location can be realized under a certain range of the loading speed. The measures such as bearing eccentricity, torsional bearing have no effect on the damage location, but the values of damage index are smaller.

Published: 01 April 2016

CLC:

U 441

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孙珂(1987—),男,博士生,从事位移影响线的应用及弯桥损伤识别等研究. ORCID: 0000 0001 5438 3084. E-mail：sk.zll@163.com

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Cite this article:

SUN Ke, ZHANG Yan qing. Damage identification of small radius curved bridge based on curvature of displacement influence line. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(4): 727-734.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.04.018 OR http://www.zjujournals.com/eng/Y2016/V50/I4/727

基于位移影响线曲率的小半径弯桥损伤识别

为了获取尽量全面的数据和减少对初始数据的依赖,在拟静力状态下测得弯梁桥竖向位移影响线（DIL）,通过二次差分获得影响线的曲率.结合缺口平滑技术构造损伤指标,来实现对该类结构的损伤识别.以某三跨小半径弯梁桥为研究对象,建立相关数值模型来验证该方法的正确性及特点；对低速加载、支座预偏心及抗扭支座布置等对识别结果的影响进行分析.结果表明：对于小半径弯梁桥,该方法利用较少的测点,不依赖损伤前的数据,适用于多损伤识别；控制加载速度在一定范围内可以满足对损伤定位的需求；支点预偏心、设立抗扭支承等构造措施对损伤定位没有影响,损伤指标数值相对变小.

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