基于局部刚度识别和曲率模态的梁结构状态预警方法  

Beam Early Warning Method based on local stiffness detection and mode shape curvature

作　　者：谈志成[1] 马中军[2,3] 张铟[1] 

机构地区：[1]南阳理工学院建筑设计院,河南南阳473004 [2]武汉理工大学土木工程与建筑学院,湖北武汉430070 [3]南阳理工学院土木工程学院,河南南阳473004

出　　处：《西安建筑科技大学学报（自然科学版）》2013年第6期847-852,863,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50978151);河南省科技攻关项目(122102210165)

摘　　要：为了对局部抗弯刚度具有不确定性的梁结构进行损伤识别和状态预警,基于虚拟分割的概念,对服役前的梁按简支工况进行静力加载,按照一种新的加载制度和跨中挠度数据处理方法可通过求解线性方程组来得到各区间的真实局部抗弯刚度值,利用得到的刚度数据可以建立有限元模型.进而对服役中的梁进行模态识别,采用曲率模态指标来进行损伤定位.研究结果表明:新方法可以有效地区分损伤和初始不确定的局部抗弯刚度,实现对真实损伤的识别,而且可以不影响梁的正常使用.Highlighted in this paper is the damage detection and status early warning of beam structures with uncertain lo- cal flexural stiffness. Based on the concept of Suppositional Partition, static load is applied to the beam before serving and the beam should be simply supported. By using a novel loading system and mid-span deflection data processing meth- od, actual local flexurat stiffness value of each interval can be obtained by solving a set of linear equations. The obtained local stiffness data can be used to establish the finite element model of beams. Subsequently, mode identification is carried out for the beam in service and mode shape curvature index has been employed to detect the position of damage. Research results show that damage and original uncertainty of local flexural stiffness can be differentiated by this new method effec- tively and then the actual damage can be detected. Moreover, serviceability of the beam will not be affected.

关 键 词：梁 预警 刚度 局部 曲率 

分 类 号：TU317[建筑科学—结构工程]