基于初始抗弯刚度识别的梁结构损伤定位  

LOCATING BEAM DAMAGE BASED ON INITIAL FLEXURAL STIFFNESS DETECTION

作　　者：马中军[1,2] 钟珞[1] 张铟[2] 

机构地区：[1]武汉理工大学,武汉430070 [2]南阳理工学院,河南南阳473004

出　　处：《力学与实践》2014年第4期437-441,446,共6页Mechanics in Engineering

基　　金：国家自然科学基金资助项目(50978151)

摘　　要：应变模态变化率指标在服役梁结构的损伤定位方面已有应用,但现有研究大多忽视了梁上的初始局部抗弯刚度具有离散性的情况,因此难以区分真实损伤和初始离散性造成的局部刚度变化,对于实际梁结构的应用效果不佳.先提出了一种通过求解线性方程组来得到梁上各区间真实初始抗弯刚度的方法,然后采用应变模态变化率指标来进行损伤定位.研究结果表明,该方法可以处理梁上初始局部抗弯刚度具有离散性的情况,实现准确的损伤定位.The strain mode variation rate used to be applied for locating the damage of in-service beam structures. However, the uncertain initial local flexural stiffness of the beam structures is not well considered in most present studies. Therefore, the actual damage and the original uncertainty of the local fiexural stiffness cannot be differentiated effectively. Therefore, the application of this index to real beam structures does not give satisfactory results. A local flexural stiffness detection method is proposed in this paper. In this method, the actual local flexural stiffness value of each segment of the beam can be obtained by solving a set of linear equations. Subsequently, the strain mode variation rate can be employed to locate the damage. It is shown that the damage can be located exactly based on the actual initial flexural stiffness parameters of the beam structures.

关 键 词：梁 损伤定位 离散性 应变模态 变化率 

分 类 号：TU317[建筑科学—结构工程]