自由度匹配技术在框架结构损伤识别中的应用研究  

The study of model match techniques used in damage identification on frame structure

作　　者：肖烨[1] 陈剑毅[1] 易萍华[1] 

机构地区：[1]东华理工大学土木与环境工程学院,江西抚州344000

出　　处：《四川建筑科学研究》2011年第2期80-82,94,共4页Sichuan Building Science

基　　金：东华理工大学校长基金(DHXK1008)

摘　　要：实测自由度与理论自由度不匹配是结构损伤识别技术应用于实际工程中的一大难题,模型缩聚和模态扩阶技术是解决这一问题的主要方法。通过单层框架结构有限元模型的数值模拟,利用振型转角差损伤识别方法,较好地实现了测试信息不完备情况下的框架结构损伤识别。结果表明,利用Guyan减缩法与模态扩阶法进行自由度匹配后再进行损伤识别,其结果非常准确,可以应用于框架结构的损伤识别。Mismatching between the degrees of freedoms（DOFS） of the measurement model and those of the finite element model is a difficult problem when damage detection technique is used to the actual project.Model reduction algorithms and modal expansion algorithms are the main methods to solve the problem.Through a numerical simulation of the single-layer frame structure finite element model,the damage identification of frame structure under the incomplete measurement information is realized by using mode shape rotation difference.The results show that by using Guyan reduction and modal expansion algorithms to match the DOFS are of high accuracy,which indicates that model reduction and modal expansion algorithms can apply to the damage identification of frame structure.

关 键 词：模型缩聚 模态扩阶 振型转角差 框架结构 损伤识别 

分 类 号：TU313.3[建筑科学—结构工程]