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由于混凝土材料的离散性、测量噪声等因素的存在,在进行损伤识别的过程中需考虑不确定性因素的影响。该文着重研究考虑结构参数不确定下的损伤识别,该文考虑了不确定量为给定均值和方差的正态高斯分布随机变量,基于参考有限元模型和观测的位移响应,利用统计矩的方法,经过两步模型修正,分别得到了无损结构和有损结构的概率模型,进而通过定义的PDE(The probability of damage existence)确定结构各离散单元的损伤存在概率。以白噪声作用下的悬臂梁及非平稳KT谱作用下的十层剪切框架为例,验证该方法的可行性。
Due to the dispersion of concrete material and the existence of measurement noise, the influence of uncertain factors must be considered in the process of damage identification. This paper focuses on the damage identification under the uncertainty of structural parameters. This paper considers the normal Gaussian distribution random variables with uncertainties as a given mean and variance. Based on the reference finite element model and the observed displacement response, Method, a two-step model is modified to obtain the probability model of the lossless structure and the lossy structure respectively, and then the probability of damage of each discrete element in the structure is determined by the defined PDE (The probability of damage existence). The feasibility of this method is verified by using the ten-story shear frame under the action of white noise and non-stationary KT spectrum.