轻型门式刚架的平面内稳定系数计算

针对现行规范或规程对轻型门式刚架设计中有关稳定系数取值的局限,用有限单元法对门式刚架进行平面内弹性稳定的整体分析,所得变截面柱在刚架平面内的计算长度系数,不受传统设计中刚架结构形式和荷载作用条件的限制;利用等效转动刚度的概念,对楔形梁在刚架平面内的换算长度系数进行了讨论,在大量算例分析的基础上,指出换算长度系数与变截面构件几何尺寸及内力之间的变化关系,以供结构设计人员参考.

In-plane Stability Factors Calculating of Light-weight Portal Frame

This paper aims at the limitation of concerned stability factors of light-weight portal frame specified by the current code, carries out the global analysis of in-plane elastic stability of portal frame with the help of finite element method, the resultant calculating length factor of tapered column may be free from the restriction of structure shape and loading condition of traditional frame design. Then by using the concept of equivalent rotation-stiffness, the in-plane equated length factor of tapered beam is discussed here, a lot of numerical studies are carried out to indicate the variable relationship between the above factor and the geometrical dimension as well as the internal force of tapered member, the analysis results can be useful for those who make structural designs.