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小波包和频响函数随机-模糊统计的斜拉桥损伤识别

, PP. 18-23

Keywords: 斜拉桥,小波包,频响函数,随机模糊统计,损伤识别,虚拟激励,损伤指标

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Abstract:

针对单点损伤识别方法的缺点,提出了基于频响函数和小波包能量谱的斜拉桥多点损伤识别指标。对结构损伤前后的频响函数值进行了随机-模糊均值处理,将处理的频响函数作为基进行小波包能量谱分析,提取能量累积变异值进行损伤识别,并进行了独塔斜拉桥模型的试验研究和连续梁与简支梁的数值仿真。分析结果表明桥梁上有1处和2处损伤时都可被识别和定位;损伤指标随着损伤程度的增加而变化,损伤初期呈线性变化,损伤程度在40%~50%时,指标变化趋缓,损伤超过50%后,指标值又会急剧变化;采用锤击激励比环境激励的损伤识别结果更好,锤击激励力大小对损伤识别效果无影响。

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