基于局部抗弯刚度识别的梁结构状态预警  

Early warning of beam structure status based on local flexural stiffness detection

作　　者：马中军[1,2] 张铟[2] 

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

出　　处：《广西大学学报（自然科学版）》2013年第4期845-850,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：河南省科技攻关项目(122102210165)

摘　　要：实际的梁结构大多因具有不一致的局部抗弯刚度而影响到对其真实损伤的识别。为了准确地发现损伤,进而实现梁结构的状态预警,需要区分出真实损伤和初始抗弯刚度的不一致性。为此,首先将完好的梁划分成n个区间,以各区间的抗弯刚度作为未知量,然后考察梁在n次加载下的跨中位移响应,得到一组线性方程,求解后可得到真实的局部抗弯刚度值。当梁发生损伤后,重复进行一次同样的过程,可以得到一组新的局部抗弯刚度值。通过对比这两组局部刚度数据即可获得真实的损伤信息。研究结果表明:新方法可以有效地区分真实损伤和局部刚度的初始不一致,从而提高状态预警的准确性。Most real world beam structures have the detection of actual damage difficult. In order inconsistent to detect the local flexural stiffness, which makes damage precisely and to achieve early warning of beam structures status, it is necessary to distinguish the actual damage from the uncer- tainty of initial local flexural stiffness. For this purpose, an intact beam was divided into n partitions firstly in this study. Local flexural stiffness values of each partition were seen as unknown parame- ters. Subsequently, the mid-span displacement reactions of the beam under n kinds of load were studied, and then a group of linear equations were established. By solving these equations, values of flexural stiffness parameters can be obtained. When the beam is damaged, the same process should be carried out once again, and a new group of flexural stiffness parameters can be obtained. By com- paring these two groups of stiffness parameters, real damage information can be discovered. Re- search results show that actual damage and uncertainty of initial local flexural stiffness can be differ- entiated by this new method effectively. The effect of early warning system can be improved accord- ingly.

关 键 词：损伤 局部 离散 识别 预警 

分 类 号：TB121[理学—工程力学] TU3[理学—力学]