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针对土木工程中实测模态相对较少,很难进行大型结构的损伤识别的困难,提出附加虚拟支座的损伤识别方法。该方法利用约束子结构方法在结构上附加虚拟支座来增加结构形式的方法,增加识别模态的数量,从而实现结构的准确损伤识别。约束子结构方法的基本思想是通过响应的卷积组合为零将传感器转化为虚拟支座。将附加虚拟支座后的结构定义为虚拟结构,每个虚拟支座对应一个虚拟结构,那么在结构上不同位置附加虚拟支座,则可以获得多个虚拟结构的模态;联合所有虚拟结构和对应的频率即可准确快速的识别出整体结构的损伤。最后通过三层空间框架模型验证方法的有效性。
Aiming at the difficulty of recognizing the damage of large-scale structures in the relatively small measured modes in civil engineering, the damage identification method of additional virtual bearings is proposed. The method uses the constraint substructure method to attach a virtual support to the structure to increase the method of the structure form and increase the number of recognition modalities so as to realize the accurate damage identification of the structure. The basic idea behind the Constraint substructure approach is to transform the sensor into a virtual support with a convolution combination of responses of zero. The structure after the additional virtual support is defined as a virtual structure, and each virtual support corresponds to a virtual structure, and then the virtual support is attached at different positions in the structure to obtain the modalities of multiple virtual structures. Combining all the virtual structures and Corresponding to the frequency can be accurately and quickly identify the overall structure of the injury. Finally, the validity of the method is verified by the three-layer space frame model.