基于分布式应变监测的大跨度斜拉桥结构损伤探测

发布时间：2018-04-27 06:15

本文选题：小波变换 + 分布式光纤　；参考：《防灾减灾工程学报》2014年01期

【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 has typical local properties, which usually show abnormal local strain. The distributed monitoring of structural strain and the analysis of damage sensitive characteristics are one of the ideal ways to detect and locate the damage of long-span bridges. However, due to the influence of environmental noise, the monitoring of distributed strain signals often can not accurately reflect the damage of the structure. Therefore, a multi-scale analysis method for the strain distribution of cable-stayed bridge deck measured by distributed optical fiber is proposed by wavelet transform. This method can overcome the adverse effects of the observed noise and spatial resolution average effect on the distributed fiber strain monitoring signal and accurately determine the location of the singularity point of the spatial signal on the bridge deck. At the same time, a model cable-stayed bridge with a scale of 1: 150 was built in the laboratory. The effectiveness of the proposed method is verified by analyzing and comparing the experimental results of the numerical model and the physical model of cable-stayed bridge.
【作者单位】：大连理工大学海岸与近海工程国家重点实验室;
【基金】：国家自然科学基金委创新研究群体基金项目(51121005)资助
【分类号】：U448.27;U441.4

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