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An improved method of damage identification of random beam structures[J].计算力学学报,2018,35(4):451~457

An improved method of damage identification of random beam structures
An improved method of damage identification of random beam structures

DOI：10.7511/jslx20170311001

 作者 单位 E-mail 黄斌 武汉理工大学 土木工程与建筑学院, 武汉 430070 binhuang@whut.edu.cn 郭文豪 武汉理工大学 土木工程与建筑学院, 武汉 430070 鲁溢 武汉理工大学 土木工程与建筑学院, 武汉 430070 朱芙蓉 南昌工学院 建筑工程学院, 南昌 330108

针对已有的损伤识别方法会出现损伤误识别的问题，本文在已有方法的基础上发展了一种随机梁式结构静力损伤识别的改进方法。假定静力荷载下梁式结构初始模型参数（如弹性模量和几何尺寸等）及测量误差为随机量，给出已有的基于随机有限元模型的梁式结构静力损伤识别方法，并进一步提出了一种改进方法。该方法通过设定损伤概率指标的阈值和反复迭代对结构损伤识别进行改进。数值算例和简支梁静力试验表明，考虑初始模型的不确定性以及静力响应测量误差，本文方法相较已有方法可以更有效地识别梁式结构的损伤。

Considering that the existing damage identification methods may lead to false prediction of damage,this paper presents an improved method of damage identification of random beam structures under static loads on the basis of existing methods.At first,assuming that the initial model parameters,such as elastic modulus,geometric dimension and so on,of a beam structure and the measurement error are random,the static damage identification method of the beam structure reported in the literature is reviewed based on the stochastic finite element model.On this basis,an improved method is put forward by setting the threshold of damage probability index and a series of iterations.Two numerical examples and an experiment of beam structures show that considering the uncertainty of the initial model and the static measurement error,the improved method proposed in this paper can more effectively identify the damage of beam structures than existing methods.