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网架是以杆单元作为主要构件的结构,节点损伤信息无法反映损伤杆单元的真实位置。采用单元损伤信息作为杆单元损伤位置判定的参数,结合杆单元损伤前后的应变模态差,建立了杆单元应变模态损伤识别方法。损伤表现为信号局部特征的改变,而小波分析在时域和频域上都具有表征信号局部特征的能力,故将杆单元损伤前后应变模态差作为结构损伤指标,应用小波变换对网架损伤杆单元进行定位。将该方法应用于一个正放四角锥网架结构的杆单元损伤识别,结果表明,该方法在低阶模态下就能较准确地定位网架结构中单一或多个损伤的位置。
The grid structure is based on the pole unit as the main component. The damage information of the node can not reflect the real position of the damaged pole unit. Using the damage information of the cell as the parameter to determine the damage location of the rod element, the damage modal identification method of the rod element was established based on the difference of strain modes before and after the rod element damage. The damage manifests itself as a change in the local characteristics of the signal. However, the wavelet analysis has the ability to characterize the signal in both the time and frequency domains. Therefore, the strain modal difference before and after the rod element damage is taken as the structural damage indicator. Pole unit for positioning. The proposed method is applied to the identification of damage of a rod element of a quadrangular pyramid with positive grid structure. The results show that the method can accurately locate the single or multiple damage in the grid structure under the low order mode.