基于小波包能量谱的空间钢框架结构两阶段损伤识别与定位研究  

Study for steel frame structures damage identification based on wavelet packet energy spectrum

作　　者：胡卫兵[1] 刘凌宇[1] 乔冠东[1] 文自刚 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2015年第4期492-497,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省科学技术研究发展计划项目(2013K13-02-08);国家自然科学基金项目(51378245)

摘　　要：结构损伤的发生会改变结构的动力响应,因此可以用结构动力响应的变化来识别结构损伤.在将结构的动力响应与小波包能量谱相结合的基础上,提出新的结构损伤识别指标能量谱均值偏差ESAD(Energy Spectrum Average Deviation)和节点层间位移总能量差变化率EDRV(Energy difference rate ofvariation),并通过数值模拟,将其应用于一座四层两跨钢框架结构的损伤识别上,进行有效性的验证.分析表明:第一阶段,在较少的动力响应提取点的情况下,指标ESAD能很好地识别出结构不同工况的损伤及初步判断损伤发生在结构的哪一侧位置,并且该指标与损伤的严重程度成正比;第二阶段,根据损伤发生所在侧位的各层节点位移响应,指标EDRV可以定位到损伤发生所在的层数.Structural damage occurrence will change the structural dynamic response,so the change of structure dynamic response can be used to identify the structural damage.On the basis of combining dynamic response of the structure with the wavelet packet energy spectrum,a new structure damage identification indexes i.e.energy spectrum average deviation and the variation rate of total energy difference for node storey drift were presented,and verifying the validity of damage identification index was verified by finite element simulation of a four-layer and two cross steel frame structure.Analysis shows that：In the first stage,the index ESAD can help identify structural damage and determine the location to the different working conditions well,under the condition of a less dynamic response extraction point,and the index is positively correlated with the damage degree.In the second stage,according to the displacement response of each layer node in the side of damage occurred,the index EDRV can help locate layer which the damage occurred.

关 键 词：结构动力响应 小波包能量谱 钢框架结构 损伤识别与定位 

分 类 号：TU02[建筑科学]