方治华¹，  岳鹏飞¹，  贾宏玉^1,2
    （1 内蒙古科技大学建筑与土木工程学院，包头014010；2 南京航空航天大学宇航学院，南京210016）

[摘要] 应用ANSYS建立了空间刚架结构无损伤和有损伤的有限元模型，根据结构动态特性参数对损伤位置和损伤程度的敏感性分析，选取单元模态应变能变化率作为标示量应用于结构损伤识别。对空间刚架单元模态应变能变化率进行计算。结果表明，一阶应变能变化率能够很好地对单一或多个损伤的损伤位置进行识别，也能根据一阶应变能变化率对损伤程度进行初步判断，为探索通过应变能变化率识别空间刚架的结构损伤提供了一种可行的方法。
[关键词] 空间刚架；结构损伤；应变能；损伤识别
中图分类号：TU328    文献标识码：A    文章编号：1002-848X(2011) S2-0266-04

Research on damage of space rigid frame based on change rate of strain energy identification method
Fang Zhihua¹, Yue Pengtei¹, Jia Hongyu^1,2
(1 Architecture and Civil Engineering School, UST Inner Mongolia, Baotou 014010, China; 2 College of Aerospace Engineering, NUAA, Nanjing 210016, China)

Abstract: Finite element models of space frame structure with or without damage were established by ANSYS software. Sensitivity analysis of the damage location and damage degree were carried out according to the structure dynamic characteristics parameters. The change rate of element modal strain energy as the labeled amount was selected and applied to structural damage identification. The element modal strain energy change ratio of space frame was calculated. The results show that the change rate of the first-order strain energy change rate not only identify against single or multiple damage location, but also detemune the initial degree of injury.Afeasible method was provided by identifying the space frame structural damage of the strain energy change rate.
Keywords: space rigid frame; structural damage; strain energy; damage identification