小波分析在钢筋混凝土梁损伤识别中的应用

为识别钢筋混凝土简支梁的损伤状况,对简支梁进行了逐级加载实验,每级加荷后卸荷,观测梁的裂缝,并测定梁的动力反应.将钢筋混凝土简支梁作为无限自由度体系,并对该体系的动力方程进行小波变换,得到多尺度下的结构动力响应表达式.信号经多尺度分解后,包含了信号中更多的结构损伤信息.基于此,用DASP信号处理系统对钢筋混凝土简支梁各损伤阶段的动态信号进行二进制小波分解,通过分析各频段的波形,确定了梁的损伤.

Application of wavelet analysis to damage detection of reinforced concrete beams

In order to detect the damage of simple-supported reinforced concrete (RC) beams, experiment set-up for RC beams dynamic test was designed. In the test, the beam was subjected to an increasing static load in the middle to introduce cracks, and the last load step corresponded to failure. After each load step and unloading, the beam crack width was investigated and an experimental dynamic monitoring was performed. The multipie degree-of-freedom dynamic equation of the testing beam was wavelet transformed, and the structural dynamic response expression on multi-scale was acquired. It is shown that multi-scale decomposition of signal comprises more structural damage information. By means of DASP signal processing system, binary wavelet transformation is applied to the dynamic signal of reinforced concrete beams on different damage states. Through analyzing the wave-figure of all frequency scales, the damage of reinforced concrete beams is determined.