节点板在支撑轴压力作用下的稳定分析

为研究支撑框架结构中与梁柱连接的支撑节点板受压稳定性和影响因素,并给出节点板稳定验算的合理方法,对不同规格的节点板进行特征值分析和全过程双重非线性分析.通过按特征值分析得到的节点板弹性稳定承载力,反推出节点板板柱模型的计算长度系数,得到关键参数对板柱计算长度系数的影响规律,给出简单实用的计算长度系数双线性表达式.通过支撑板式连接节点的非线性分析,得到不同参数下节点板稳定承载力的精确值,在分析其变化规律的同时,验证了按所提计算长度系数表达式确定节点板稳定承载力的合理性.

Gusset plate buckling under compression caused by bracing members

To explore the gusset plate buckling and its influence factors under compression caused by bracing members in braced frames,and to obtain an appropriate buckling design method,the buckling behaviors of gusset plates with varied parameters are computed by eigenvalue analysis and nonlinear analysis.With the capacity eigenvalue of elastic buckling,the effective length factor of assumed plate-column of gusset plate is derived from Euler’s formula.The influences of some key parameters on the effective length factor are studied,and a simplified bilinear formula used to calculate the effective length factor is proposed.The exact solutions of buckling capacities taking into account of the material and geometrical nonlinearities are attained by nonlinear analysis program,the buckling influence factors of the gusset plates are evaluated,and the rationality of the designed buckling capacities with the proposed effective length factors is verified.