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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。
Based on the definition of probability of the initial model and structural damage, a statistically significant method for static damage identification of beam structures is given. On this basis, the influence of the uncertainty of the initial model on the damage identification is studied. After numerical analysis, it is found that when the uncertainty of the initial model is lower than or almost equal to the degree of damage, the method of this paper still has better damage recognition effect. When the degree of uncertainty of the initial model exceeds the degree of structural damage, structural damage cannot be identified. Therefore, in order to obtain better damage identification results, it must be ensured that the initial model has sufficient accuracy.