顶底角钢连接的初始刚度和极限承载力计算

Calculation of initial stiffness and ultimate bearing capacity of top-and-seat angle connections

在顶底角钢连接的三参数幂函数模型中,求解初始刚度的传统方法是将顶角钢假定为悬臂梁模型,但这一假定与试验及有限元分析结果有出入。根据顶底角钢连接破坏时的塑性铰分布规律,提出了符合顶角钢实际受力状态和变形特征的刚架模型,并推导了顶底角钢连接初始刚度和极限承载力的解析表达式。

In three parameter power models of top-and-seat angle connections, the cantilever beam assumption model for top angle is made in the traditional method to determine the initial stiffness of the semi-rigid connection. However, the assumption is discrepancy with experiment and finite element method analysis. A frame model is raised, based on the distributing orderliness of plastic hinges which is consistent with the actural load carrying state and distortion character of the top angle, and the analytic expressions of initial stiffness and ultimate bearing capacity are derived.