初始模型的不确定性对梁式结构静力损伤识别的影响

结合初始模型和结构损伤的概率定义,给出了一个具有统计意义的梁式结构静力损伤识别方法.在此基础上,重点研究了初始模型的不确定性对损伤识别的影响.经数值分析,发现当初始模型的不确定程度低于或基本相当于损伤程度时,本文的方法依然具有较好的损伤识别效果.而当初始模型的不确定程度超过结构损伤程度时,已无法识别出结构损伤.因此,为了获得较好的损伤识别结果,必须保证初始模型具有足够的精度.

Impaction of Uncertain Initial Model on Damage Identification of Beam Structures Subjected to Static Load

Based on the probabilistic definitions of initial undamaged model and structural damage,a statistic identification method is proposed to detect the damage of beam structures under static loads in this paper.Furthermore,the highlight is given to the affection of uncertainty of initial undamaged model on damage identification.Numerical investigation of a simply supported beam shows that the identification effectiveness of the proposed method is acceptable until the uncertain degree of initial undamaged model is large than that of structural damage.Therefore,it is necessary to make the initial undamaged model to be accurate enough for obtaining good identification results.