摘要
基于地下框架结构损伤前后动力特性的分析,证明了模态应变能变化对单元损伤的敏感性。选择单元模态应变能变化率作为人防结构损伤诊断的标识量,证明了多位置损伤状态下产生的单元模态应变能变化率是单位置损伤状态的叠加,并提出了应用组合优化求解结构多位置损伤诊断的方法。以一典型的人防工程为算例,通过对其在不同损伤情况下计算结果的分析和讨论,说明所提出方法是有效可行的,它不仅可以准确完成人防结构的损伤诊断,并且简化了损伤诊断过程。
Based on the analysis of the dynamic properties of underground frame structure before and after damage,it was found that modal strain energy is sensitive to the damage of element.The variation rate of element modal strain energy was taken as the index for damage detection,and it was proved that the variation of element modal strain energy caused by multiple damage state was superposition of that by single damage state.An integrated optimization method was proposed to detect damages of a typical civil air defense structure.Calculation results under different damage situations were analyzed and discussed.The results show that the proposed method can identify the damages in the structure accurately and simply.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2010年第6期642-645,共4页
Journal of Vibration,Measurement & Diagnosis
基金
陕西省自然科学基金资助项目(编号:SJ08E10)
关键词
单元模态应变能
地下框架结构
损伤诊断
组合优化
element modal strain energy underground frame structure damage diagnosis combined optimization
