基于复合反演算法的结构损伤识别及地震动反演研究

Structural damage identification and ground motion inversion based on hybrid inversion algorithm

针对输入激励信息未知、输出响应信息非完备的情况,进行了结构损伤识别算法研究。基于物理参数时域识别的复合反演算法,定义单元刚度参数变化率为损伤因子,并引入矩形窗方法剔除噪声异常数据,给出了时域内结构损伤识别复合反演算法(损伤识别和地震动反演)。以一个5层框架结构为例进行了数值仿真识别损伤,针对矩形窗长度、噪声水平不同等情况对比了识别结果(损伤识别精度、损伤位置确定)和收敛速度,并比较了反演的地震动与真实地震动时程曲线。研究表明,所提基于复合反演算法建立的结构损伤识别复合反演算法是非常有效的。

In this paper, structural damage identification algorithm was studied for the case with unknown input and incomplete output dynamic response information. Based on the hybrid inversion method for physical parameter iden- tification in time domain, the change rate of element stiffness being defined as the damage factor, lar window method being introduced for removing the abnormal noise data, a hybrid inversion and ground motion inversion） of structural damage indentification in time domain was proposed. and the rectangu- （ damage detection A numerical simu- lation of 5 - stories frame model was conducted. Considering the different lengths of rectangular window and the dif- ferent noise levels, the identification result （damage identification accuracy and damage location） and convergence rate were compared. Simultaneously, the time - histories of ground motion inversion are compared with those of the real ground motion. The results show that the hybrid inversion algorithm established in the paper for structural dam- age identification and ground motion inversion is very effective.