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针对单一方法损伤识别的缺点,提出了基于频响函数和小波包能量谱的斜拉桥损伤识别指标,结构损伤前后的频响函数作为信号,进行小波包能量谱分析。由于试验中的频响函数存在一定的随机模糊性,对完好状态下的10次频响函数值进行了随机模糊均值处理,得到的频响函数作为基准。独塔斜拉桥模型实验表明,斜拉桥的一处和两处的损伤都可以识别,损伤位置也能确定,锤击实验效果好于敲击桥墩激励的识别效果,通过仿真证明了连续梁桥跨中和支座附近的损伤也可以识别,并且外界激励对损伤指标的识别没有影响,为大型桥梁结构在线监测提供了一种方法。
Aimed at the disadvantage of single method of damage identification, the damage identification index of cable-stayed bridge based on frequency response function and wavelet packet energy spectrum is proposed, and the frequency response function before and after structural damage is taken as signal to analyze wavelet packet energy spectrum. Due to the existence of certain random ambiguity in the frequency response function of the experiment, the random fuzzy mean value of the 10 th frequency response function under the intact condition is processed. The frequency response function obtained is taken as the reference. Single-pylon cable-stayed bridge model experiments show that one or two damage of cable-stayed bridge can be identified, the location of damage can also be determined, the hammering effect is better than that of percussion piers, and the simulation results show that the continuous beam The damage near the bridge mid-span and the support can also be identified, and the external stimulus has no influence on the identification of the damage index, which provides a method for on-line monitoring of the large-scale bridge structure.