Research on Health Monitoring of Frame Shear Wall Structures Based on Wavelet Packet Transform
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摘要: 为了及时发现住宅楼房中业主私自改造楼房所造成的承重墙结构损伤,提出了一种使用基于小波包变换对楼房结构进行健康监测的方法。使用ANSYS有限元软件建立框架剪力墙结构的计算模型,模拟多种损伤工况,计算结构上测点的加速度响应,使用MATLAB软件对测点响应信号进行小波包变换和小波包能量计算,最后通过损伤指标DDE(小波包曲率能量标准偏差)进行损伤识别。结果表明:使用小波包能量变换结合损伤指标DDE的损伤识别方法能够有效监测框架剪力墙的结构损伤,该方法能够在承重墙结构被破坏时及时获得损伤监测结果,配合预警和报警设备使用将有更好的防治效果。Abstract: To discover the damages to load-bearing wall structures caused by property owners' unauthorized reconstruction in residential buildings in a timely manner, this paper proposed a health monitoring method based on wavelet packet transform for building structures. The finite-element software ANSYS was used to build a calculation model for frame shear wall structures. Various damage conditions were simulated, and the acceleration responses at the measuring points on the structure were calculated. Furthermore, the software MATLAB was employed for the wavelet packet transform of the response signals at the measuring points and the calculation of the wavelet packet energy. Finally, the damage index DDE (curvature of the standard deviation of wavelet packet energy) was used for damage identification. The results show that the damage identification method combining wavelet packet energy and transform with damage index DDE can effectively monitor the damages to frame shear wall structures. The method can obtain damage monitoring results timely when a load-bearing wall structure is damaged, and better prevention and control effects can be achieved when the method is supported by early warning and alarm equipment.
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Key words:
- shear wall /
- health monitoring /
- wavelet packet /
- wavelet packet energy /
- finite element
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