一种框架结构损伤诊断两步法

提出了一种仅用限模态信息的结构损伤诊断两步法。第一步,利用测量自由度正则化损伤指标向量得到损伤构件的大致区域。第二步,在第一步选定的区域内,利用设计灵敏度技术对可能的损伤构件进行定位、定量分析。利用四层平面框架进行了数值模拟,建立四层平面框架的有限元模型,用不同单元弹性模量的降低来模拟各种不同的损伤工况,并对每种损伤工况进行了损伤位置和损伤程度的诊断,数值模拟结果表明,本文所提出的结构损伤诊断的两步法是可行的。

A TWO- STEP DAMAGE DETECTION APPROACH FOR FRAME STRUCTURE

This paper described a two-step structural damage detection approach with limited modal information.Firstly,the damaged areas were approximately localized by the damage indicator of the measured degree of freedom.Secondly,the damaged elements were located and quantitatively analyzed by the technique of design sensitivity in the selected areas.The method was simulated with a 4 floor plane frame,the finite element model of the 4 floor plane frame were created,the different damage scenarios were simulated by decreasing the elastic modulus of different elements of the frame,every damage scenarios were detected.According to the simulation results,the two-step damage detection approach was effective.