基于曲率模态的薄板结构的损伤定位研究  

STUDY ON DAMAGE DETECTION OF SHEET STRUCTURE USING CURVATURE MODEL

作　　者：沈庆阳 纪国宜[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《工业建筑》2013年第S1期322-326,共5页Industrial Construction

摘　　要：对某两端固支的板结构进行有限元建模,得到结构位移模态数据。针对不同损伤程度、不同损伤位置下的单损伤和多损伤的情况,选取结构损伤前后的曲率模态差作为损伤定位的指标,对其进行损伤定位。对于弹性薄板结构提出分别考虑节点两个方向上的曲率模态的变化损伤定位准则,综合两个方向上得到的曲率模态的变化,认为两个方向上都出现突变的单元即为损伤的单元。仿真结果显示,仅利用弹性薄板结构一阶位移模态得到的各个节点的曲率模态的变化,可以准确地定位结构损伤位置。对工程实际中的薄板结构损伤定位有很好的指导意义。The finite element method is used to model a two-end-fixed plate structure,and the displacement model data are got.Changes of the curvature of the structure are selected as the indicator to locate the damage.Different damage elements with different damage degrees are simulated.A two-way damage location rule is put forward which takes the changes of curvature both in the x direction and y direction separately.The element which appeared in those two results is the damage unit.The simulation result shows that,this method can accurately locate the damage in the structure using only the first displacement mode.which can provide a significant method to locate the damage in a sheet structure in practice.

关 键 词：板结构 曲率模态 损伤定位 有限元 

分 类 号：TU312.3[建筑科学—结构工程]