结构-岩土相互作用对结构损伤识别的影响

在时间域内,采用最小二乘法,研究了结构-岩土相互作用(SSI)对损伤识别的影响.通过对结构施加强迫振动并观测结构的动力响应,辨识刚度等结构参数进行损伤识别.研究表明,当结构响应计算和辨识模型都不考虑或都考虑SSI时,辨识参数随观测噪声的降低而收敛于真值,当结构反应计算考虑SSI、辨识模型不考虑SSI时,无论是否考虑可行域约束,辨识参数不随观测噪声的降低收敛于真值,辨识结果的可信度很低,SSI的影响不容忽视.

Influence of Structure-Soil Interaction on Identification of Damage to Structure

The influence of structure-soil interaction(SSI) on identification of damage to structure was studied using time domain and least-square methods.The parameters of a structure such as rigidity can be identified by forcing the structure into vibrating and observing its dynamic response,thus identifying the damage to the structure.During the computation of structure response and model identification,no matter SSI is considered,the identified parameters converge at the true value with lowering sensor noise.When SSI is taken into account in the computation of structure response but not taken in model identification,no matter the restriction on feasible domain is considered,the identified parameters converge at the true value with no relation to sensor noise and,as result of identification,the dependability is very low.So the influence of SSI can not be ignored.