柱脚固接有吊车厂房门式刚架柱的计算长度

有吊车厂房中框架柱轴力和截面都阶型变化 ,对于柱脚固接的阶型柱 ,规范只给出了顶端铰支或固支时的计算长度系数 ,没能考虑梁对柱的约束作用。通过对柱脚固接阶型的弹性屈曲分析 ,得到了框架柱平面内、平面外计算长度系数的表达式和计算表格 ,结果与有限元分析符合较好。在此基础上 ,对计算长度系数公式进行了简化

EFFECTIVE LENGTH FACTOR FOR THE BASE-FIXED COLUMN FOR PORTAL FRAMES WITH CRANE LOADS

Because of the crane loads,columns in portal frames are stepped.The effective length of the stepped columns is not available either from the specifications or from the literature,when the column base is fixed.This paper analyses the buckling of hinged portal frame with crane loads.Formulas and tables of the effective length factors for the base\|fixed column both in plane and out of plane are proposed.The results from the proposed method are in good agreement with those of FEM,based on which the formulas of the effective length factors are also simplified.