基于小波变换的钢结构连廊损伤识别  

Damage Identification of Steel Structure Corridor Based on Wavelet Transform

作　　者：周成杰[1] 陈清军[1] 张帅[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《力学季刊》2013年第2期302-309,共8页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(50978198)

摘　　要：以某实际钢结构连廊为背景,采用ANSYS软件建立连廊结构的三维有限元分析模型,通过现场环境振动测试验证了文中连廊结构模型的合理性。针对这一较复杂结构的损伤识别问题,文中基于小波变换理论,构建了一种"变异放大系数"。本文的数值计算算例表明,利用这种"变异放大系数"曲线的峰值可以更有效地判别损伤位置,而"变异放大系数"峰值的大小则可较方便地判别结构的损伤程度。同时,文中探讨了不同小波函数和尺度伸缩因子对连廊结构单处和两处损伤的识别效果的影响,给出了小波函数和尺度伸缩因子的取值建议。Selecting a steel structure corridor as the research object, the 3D finite element model was es- tablished by ANSYS program, and the reasonability of numerical model was verified by ambient vibration test. Aiming at the problem of complex structure damage identification, a new parameter named ＂Varia- tion Magnify Coefficient （VAMA）＂ was proposed based on wavelet transform theory. The numerical simu- lation presented that the structure damage location could be detected more effectively through the peak of VAMA curve, also the damage degree could be discriminated according to the VAMA peak value. Besides, the influence to single and double damage identification caused by different wavelet function and different scaling dilation factor was discussed, and the suggested values of wavelet function and scaling dilation factor were proposed.

关 键 词：小波变换 钢结构连廊 损伤识别 变异放大系数 

分 类 号：TU311.3[建筑科学—结构工程]