基于连续小波空间变换的工程结构损伤识别

DAMAGE INDENTIFICATION OF ENGINEERING STRUCTURE BY SPATIAL CONTINUOUS WAVELET TRANSFORM

利用连续小波空间变换技术,对工程结构损伤信号进行分析,从而识别结构的损伤位置。对不同的边界条件(如简支梁和固端梁)下不同的损伤形式(如竖直裂缝和斜裂缝)引起结构损伤的情况进行试验。结果表明,用连续小波空间变换分析识别结构损伤的结果受一定边界条件的影响,而裂缝的形式对识别效果几乎没有产生影响。但总的来说,小波空间变换都能够方便简捷、准确可靠地识别出结构的损伤位置。

A structural damage identification technique based on wavelet transform of spatial structural response measurements is discussed. The two different boundary conditions considered are simply supported and fixed end support, and the different damage forms （crack characteristics） are investigated by numerical experiments. The results of the simulation show that boundary conditions have some effect on bridge damage detection, but the damage forms have no effect on it. All in all, if a suitable wavelet is selected, the method is capable to extract damage information from the response signal in a simple and reliable way.