网壳结构损伤识别理论及仿真研究  

Theory and simulation of damage detection in reticulated shell

作　　者：刘伟[1] 高维成[1] 

机构地区：[1]哈尔滨工业大学航天科学与力学系,黑龙江哈尔滨150001

出　　处：《哈尔滨工业大学学报》2006年第2期156-159,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50478030);黑龙江省科技攻关计划项目(GC04C101)

摘　　要：针对网壳结构特点,引入敏感模态的概念,提出利用模态置信准则确定局部损伤所对应敏感模态的算法,推导了剩余模态力的表达式,利用敏感模态进行损伤位置识别.采用最小秩摄动理论定量评估结构的损伤程度,与Baruch方法及Berm an方法进行比较分析.实际网壳工程的数值模拟结果表明,本文方法不仅可以识别单位置损伤还可以识别多位置损伤,不仅可以评估刚度变化还可以评估质量变化,对网壳结构的健康诊断是可行的.Based upon the characteristic of reticulated shell, the concept of sensitive mode shape is intro- duced. An algorithm for determining it corresponding to the local damage based on the MAC matrix is presented. The representation of residual modal force is derived. The sensitive mode shape is used to determine damage location and the minimum rank perturbation theory is used to assess damage extent. The extent evaluation results are compared with those gained using Baruch＇s method and Berman＇s method. The simulative results on one typical reticulated shell structure show that the two step damage multiple damages, and can evaluate the damage extent in stiffness detection method can determine single and and mass. It is feasible for healthy diagnoses in reticulated shells.

关 键 词：网壳结构 损伤识别 敏感模态 剩余模态力 最小秩摄动 

分 类 号：TU33[建筑科学—结构工程] O327[理学—一般力学与力学基础]