平面杆系结构的失效包络图及失效评估  

FAILURE ENVELOPE AND FAILURE ASSESSSMENT OF PLANE FRAME STRUCTURES

作　　者：赵军[1] 

机构地区：[1]河南大学土木建筑学院材料与结构研究所,河南开封475004

出　　处：《工程力学》2008年第9期39-45,共7页Engineering Mechanics

基　　金：河南大学校级自然科学基金项目(06YBZR036)

摘　　要：定义了平面杆系中的失效评估杆元、以及该杆元的正则杆端弯矩和正则杆端曲率,据此引入了杆件失效包络图、工作状态图、以及杆件失效指标,进而定义了平面杆系结构失效包络图、结构工作状态图。又据该图中反映杆元状态的点群的分布情况,分别从概率分布、加权平均和取最大值的角度定义了三种结构整体失效指标。利用杆元和结构失效指标可简明直观地进行结构失效评估,成为与通常基于结构物理性能改变的结构损伤评估不同的另一种几何评估模式。利用本方法分析了一个三跨六层框架,计算了该框架在多种荷载、梁柱线刚度比、以及失效评估杆元划分密度下的各种失效指标。The bar element of failure assessment for the plane frame structure is defined. The normalized end moment and normalized end curvature of the element are introduced. The failure envelope, the state diagram, and the failure index of the failure-assessment bar element are presented. Then the failure envelope, the state diagram, and the failure index of the plane frame structure are initiated. Three structure failure indexes are constructed considering the probability distribution. The weighted average and maximum value are obtained form the distribution of the points in the diagram representing the elements, respectively. As a geometrical scheme, the structure failure assessment which differs from the common damage assessment depending on the physical property variation of the structure is implemented concisely and graphically with these failure indexes. A frame of 3 spans and 6 storeys is analyzed. The failure indexes of the frame are solved for various loads, ratios between stiffness factors of the beams and columns, and division density of the failure-assessment bar element.

关 键 词：杆系结构 失效评估杆元 失效包络图 工作状态图 失效指标 失效评估 

分 类 号：O312.3[理学—一般力学与力学基础] O346.5[理学—力学]