基于分布式应变模态残差统计趋势的大跨斜拉桥损伤识别策略

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (7) : 78-81.

论文

基于分布式应变模态残差统计趋势的大跨斜拉桥损伤识别策略

曾欣1,2，徐赵东1

作者信息 +

Damage detection strategy based on strain mode residual trends for Long-span cable-stayed Bridge

Zeng Xin1,2, Xu Zhao-Dong1

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文章历史 +

摘要

近几年新兴的分布式测试技术得到了飞速发展，使得基于这类应变测试数据的损伤识别方法的研发显得尤为迫切。本文首先引入了分布式应变模态差损伤指标，并利用此指标对一大跨斜拉桥进行了损伤识别研究，分析了不同的测试环境、随机激励及损伤程度等因素对损伤识别效果的影响。然后对同种健康状态下的结构在不同测试环境条件下进行多次辨识，利用统计趋势分析和概率置信准则，提出了基于准分布式应变模态残差统计趋势的损伤识别策略。数值计算表明：所提策略很好的降低了各种随机干扰的不利影响，对斜拉桥主箱梁上发生损伤的多处单元都能准确识别出来，很好的解决了传统模态法损伤指标对结构早期轻微损伤不敏感的缺陷，避免了损伤淹没和误判现象。

Abstract

New distributed measuring technique has been developed rapidly in recent years, and the damage detection strategy based on distributed strain responses becomes a particularly urgent research issue. So a damage index based on distributed strain mode differential is proposed firstly, and numerical simulation analysis is carried to a long span cable-stayed bridge under different testing conditions, all kinds of random disturbances which appear in the process of damage identification are analysis. Then, the repeated identification method is adopt to structures in the same health status under different environments, and a damage detection strategy based on mode residual trend is developed by using statistical trend analysis and assurance criteria of probability. Finally, numerical simulation analysis results showed that the proposed strategy can reduce the impact of all the random disturbances and the minor damages occurred in the girder of the bridge can be accurately identified. It solves many shortcomings of the traditional modal differential damage index, i.e. insensitive to minor and early damage of structures, besides damage misjudged and damage submerged are avoided.

导出引用

曾欣;徐赵东. 基于分布式应变模态残差统计趋势的大跨斜拉桥损伤识别策略[J]. 振动与冲击, 2013, 32(7): 78-81

Zeng Xin;Xu Zhao-Dong. Damage detection strategy based on strain mode residual trends for Long-span cable-stayed Bridge[J]. Journal of Vibration and Shock, 2013, 32(7): 78-81