Damage Detection of Long-span Cable-stayed Bridge Based on the Distributed Strain Monitoring

范哲; 冯新; 周晶

doi:10.13409/j.cnki.jdpme.2014.01.007

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Damage Detection of Long-span Cable-stayed Bridge Based on the Distributed Strain Monitoring

更新时间：2025-12-11

- Damage Detection of Long-span Cable-stayed Bridge Based on the Distributed Strain Monitoring
- Vol. 34, Issue 1, Pages: 46-50+72(2014)
- 作者机构：
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- DOI：10.13409/j.cnki.jdpme.2014.01.007
  CLC： 448.27;U441.4
- Published：2014
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[1]范哲,冯新,周晶.基于分布式应变监测的大跨度斜拉桥结构损伤探测[J].防灾减灾工程学报,2014,34(01):46-50+72.

范哲, 冯新, 周晶. Damage Detection of Long-span Cable-stayed Bridge Based on the Distributed Strain Monitoring[J]. 2014, 34(1): 46-50+72.
[1]范哲,冯新,周晶.基于分布式应变监测的大跨度斜拉桥结构损伤探测[J].防灾减灾工程学报,2014,34(01):46-50+72. DOI： 10.13409/j.cnki.jdpme.2014.01.007.

范哲, 冯新, 周晶. Damage Detection of Long-span Cable-stayed Bridge Based on the Distributed Strain Monitoring[J]. 2014, 34(1): 46-50+72. DOI： 10.13409/j.cnki.jdpme.2014.01.007.

摘要

结构损伤具有典型的局部性质

通常表现为局部应变的异常。结构应变的分布式监测与损伤敏感特征分析

是实现大跨桥梁损伤探测与定位的理想途径之一。但是

由于环境噪声的影响

对分布式应变信号的监测往往不能准确反映结构出现的损伤状况。因此

提出了通过小波变换对分布式光纤测试的斜拉桥桥面应变分布进行多尺度分析的方法。这种方法可以克服分布式光纤应变监测信号受观测噪声和空间分辨率平均效应的不利影响

准确地确定空间域信号奇异点在桥面的位置。同时

在实验室建立了比尺为1∶150的模型斜拉桥。通过对斜拉桥数值模型与物理模型试验结果的分析和比较

验证了所提出方法的有效性。

Abstract

Structural damage is a typical local phenomenon

which commonly leads to the abnormality in the local strain.Monitoring the structural damage in a distributed manner

as well as extracting the damage-sensitive feature

is an effective way to detect and position the damages in the long-span bridges.However

monitoring the distributed strain may not truly reflect the damage state of the structure due to the effect of environmental noise.Therefore

a multi-scale analysis for the distributed strain signal is proposed by wavelet transform.The proposed method alleviates the noise effects on the strain signals and averaging effect

thus determines the exact location of the singular point of the spatial signal accurately and conveniently.Meanwhile

a cablestayed bridge model with scale ratio 1:150was built in the laboratory.Both of the numerical simulation and model tests were carried out on a cable-stayed bridge model to testify the effectiveness of the proposed method.

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references

斜拉桥桥面结构损伤位置识别的指标比较 [J]. 孙宗光,高赞明,倪一清,丁皓江. 工程力学 . 2003(01)

Wavelet‐Based Detection of Beam Cracks Using Modal Shape and Frequency Measurements [J] . Jiawei Xiang,Ming Liang. Computer‐Aided Civil and Infrastructure Engineering . 2012 (6)

Brillouin power spectrum analysis for partially uniformly strained optical fiber [J] . Dan Zhang,Hongzhong Xu,Bin Shi,Haibo Sui,Guangqing Wei. Optics and Lasers in Engineering . 2009 (9)

Structural health monitoring for flexible bridge structures using correlation and sensitivity of modal data [J] . B.H. Koh,S.J. Dyke. Computers and Structures . 2006 (3)

Application of Wavelet Theory for Crack Identification in Structures [J] . K. M. Liew,Q. Wang. Journal of Engineering Mechanics . 1998 (2)

Bridge-condition assessment by modal flexibility [J] . T. Toksoy,A. E. Aktan. Experimental Mechanics . 1994 (3)

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