基底输入未知条件下质量不确定结构损伤识别

针对结构各层有效质量和地震动输入均未知情况下的损伤识别问题,构造了不需要已知周围土壤、邻近结构和非结构构件影响的层间规格化刚度参数和阻尼参数,提出了一种新的逐层递推时域识别方法,给出了用规格化参数进行损伤识别的公式.为避免结构质量的影响,引入暂态影响参数和相关参数,并分析了质量误差对参数识别的影响.该方法利用测试数据时程直接进行结构损伤识别,并可反演出地震动时程.算例表明本方法切实可行.

Damage identification for structures with mass uncertainty under unknown seismic input

A new time domain transferring method for damage identification of structures with mass uncertainty under unknown seismic input is developed, which can be applied to the damage identification of structures with unknown effects of surrounding soils, adjoining structures and unstructured components. The regularized stiffness and damping parameters are constructed and the corresponding damage identification formulae are derived in terms of regularized parameters. The temporary influence parameters and correlate parameters are introduced to avoid the effects of structural mass. The effects of mass uncertainty on damage identification are studied. Based on the proposed method, the structural damage can be directly identified from structure response and the seismic history can be obtained simultaneously. Numerical example indicates the accuracy and the effectiveness of the proposed method.