混凝土桥梁健康监测信息的活载效应多尺度提取方法.docVIP

混凝土桥梁健康监测活载效应的多尺度提取方法( 唐朝霞1 梁宗保2 (1.重庆交通大学信息中心，重庆 400074；2.重庆交通大学信息科学与工程学院，重庆 400074) 摘要：作为一种可能完全替代传统荷载试验的极有潜力的方法，桥梁健康监测近年来得到了广泛重视和很多应用。桥梁健康监测系统采集到的海量数据无疑会包含结构安全的特征信息，其中活载效应是评价结构安全的最为直接的重要信息之一。但由于结构的激励因素众多，活载效应混淆于其它效应信息中，用常规的方法难以提取。根据混凝土桥梁结构监测信息的多尺度特点，在详细阐述小波分析理论的基础上，针对马桑溪长江大桥的跨中部分测点的挠度和应变实测信息，通过小波变换的方法对缓变信息和瞬变信息进行了分离，提取其中的活载效应，并通过对比相关测点的荷载试验数据来进行了验证。结果表明，所提的挠度和应变的活载效应信息的变化幅度与荷载试验中获取的动态挠度和应变变化一致, 完全能够作为桥梁结构安全评价的直接支持数据。 关 键 词：桥梁健康监测；活载效应；提取；小波变换 中图分类号： 文献标志码：A 文章编号： Extracting Live Load Effect in Health Monitoring of Bridges by Multi-scale Method Tang Zhaoxia 1, Liang Zongbao 2 (1. Information Center of Chongqing JIaotong University, Chongqing, 400074, China; 2. Dept. of Information Science and Engineering of Chongqing Jiaotong University, Chongqing, 400074, China.) Abstract: As a promising way to substitute the traditional load test, structural health monitoring of bridge has received wide concern and has been put in many applications. The huge amount of data collected from structural health monitoring system contain the safety feature information of the bridge, in which the live load effect is one of the most important supporting information for safety assessment of the bridge. However, the stimulating factors of the bridge are too many, and so the live load effect is hidden into the other effect information. It is very difficult to extract the live load effect from the total monitoring information with traditional methods. According to the multi-scale characteristic of the monitoring information, on the basis of the detail analysis of the wavelet theory, the live load effects were separated and extracted from the total information of the deflection and strain collected from Masangxi Bridge of Yangtze River. And then the effectiveness was proved by the contrast of the relative data form load test of the bridge. The results show that the varying amplitudes of the live load effects of the deflection and strain are accordant