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浙江大学学报(工学版)
土木工程     
基于小波总能量相对变化的拱桥吊杆损伤识别
项贻强, 郏亚坤
1. 浙江大学 建筑工程学院,浙江 杭州 310058; 
2. 浙江大学 唐仲英传感材料及应用研究中心,浙江 杭州 310058
Damage detection of hangers in arch bridges based on relative variation of wavelet total energy
XIANG Yi-qiang, JIA Ya-kun
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 2. Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310058, China
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摘要:

为了识别拱桥吊杆损伤,提出基于小波总能量相对变化的损伤识别方法.以一典型钢管中承式拱桥为研究对象,通过对测点处的加速度动态响应信号进行离散小波变换,计算出测点处的小波总能量.以结构未损伤状态为基准,构造基于小波总能量相对变化的损伤指标.用提出的识别方法研究冲击类型、加载位置、噪音信号及损伤程度等参数对识别结果的影响.结果表明:提出的损伤指标可识别出不同位置设定下吊杆损伤,并对损伤程度具有较强的敏感性;对于不同的冲击类型及加载位置均能识别出拱桥吊杆损伤,且在不同信噪比(0,5,10和20)下鲁棒性好.

Abstract: A damage detection method for hangers was proposed based on the relative variation of wavelet total energy in order to identify the damage of hangers in arch bridges. Taking a typical half-through steel tube arch bridge as the research object, the wavelet total energy of the measured points could be calculated after dealing with the dynamic acceleration response signals at every measured point of structure by using the discrete wavelet transform. Setting the intact structure as the baseline state, the damage index could be proposed based on relative variation of wavelet total energy. The influence of the impact type, loading location, noise and sensitivity of damage level on detection results were analyzed according to the proposed method. Results show that the proposed damage index can be used to locate place of the damaged hangers, and be sensitive to damage level. The index can detect the damage of hangers in arch bridges accurately for different impact types and load positions. It has excellent robustness to different signal noise ratio (0, 5, 10 and 20).
出版日期: 2017-05-01
CLC:  U 446.3  
基金资助:

国家自然科学基金项目(51541810);唐仲英基金会资助项目.

作者简介: 项贻强(1959—),男,教授,从事桥梁健康监测及全寿命设计理论、悬浮隧道等研究. ORICD: 0000-0002-4363-9926. E-mail: xiangyiq@zju.edu.cn
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引用本文:

项贻强, 郏亚坤. 基于小波总能量相对变化的拱桥吊杆损伤识别[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2017.05.005.

XIANG Yi-qiang, JIA Ya-kun. Damage detection of hangers in arch bridges based on relative variation of wavelet total energy. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2017.05.005.

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