基于应变模态的桁架结构损伤指标研究

英文篇名：Study on Damage Index of Truss Structure Based on Strain Modal
中文刊名：甘肃科学学报
英文刊名：Journal of Gansu Sciences
作者：杜永峰 ; 邵云飞
英文作者：DU Yong-feng ; SHAO Yun-fei(Institute of Earthquake Protection and Disaster Mitigation ; Lanzhou University of Science andTechnology ; Lanzhou 730050 ; China)
中文关键词：桁架结构 ; 应变模态改变率 ; 损伤识别
英文关键词：truss structure ; ration of the changes of strain modal ; damage identification
出版日期：2007-09-25
机构：兰州理工大学防震减灾研究所,兰州理工大学防震减灾研究所甘肃兰州730050,甘肃兰州730050
年：2007
期：03
出版单位：甘肃科学学报

摘要

基于应变模态的损伤识别方法,根据桁架结构的杆单元应变特点,利用结点的振型位移引起的杆单元长度变化从而计算得出结构的应变模态,并通过数值仿真验证了仅一阶应变模态改变率对损伤的准确识别,同时以该参数作为输入特征参数构造神经网络对杆单元损伤进行了识别,均取得了较为理想的结果.
Based on the method of damage identification of strain modal,due to the displacement of the joint which causes the unit length change of the pole in the truss structure,we can calculate the strain modal according to the strain characteristics and validate that the ration of the changes of strain modal of the only first mode can accurately identify the structural damage through the numerical simulation.We also use the parameter as the input feature to build the artificial neural network and to identify the structural damage.Good results have been achieved in both fields.

引文

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