基于附加虚拟支座的结构损伤识别方法

本文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。

Structural damage identification using additional virtual supports

Usually only some lower modes are identified in civil engineering, so it is hard to estimate the damage of large structure accurately. Aim to this problem, the method of adding virtual supports on the structure is proposed for structure damage identification. The virtual supports can be constructed by substructure isolation method using the linear combination of the responses. The structure with additional support is call virtual structure. The styles of the virtual structure are increased largely by adding virtual support on different places of the structure, and then the natural frequencies of all the virtual structures are collected and used for damage identification. A 3-D frame model is built for the verification of the proposed method additional virtual supports.