多层框架单向无梁柱稳定性研究

Stability research of column without beam in one direction in multistory frames

为解决多层框架中单向无梁柱在无梁方向计算长度过大所造成的设计困难,用有限元方法研究了影响单向无梁柱无梁方向稳定性的诸多因素,指出层数、梁(另一方向)柱线刚度比值是其中最重要的影响因素;在设计多层框架单向无梁柱时,可利用另一方向增大了平面外线刚度的框架梁作为柱无梁方向的弹性支撑来增强其稳定承载力,减小计算长度;最后,给出了可用于此类柱设计的计算长度系数及采用此系数必须满足的梁柱线刚度比值。

In order to solve the difficulty in design that the column without beam in one direction in multistory frame has too long effective length in the direction without beam,the factors which influence the stability of the column without beam in one direction are studied by FEA and a conclusion is drawn that the number of storey and the ratio of line stiffness of beam in another direction to that of column are the most important factors,and designers can take the beams in another direction as the elastic supports of the column in the direction without beam to enhance the stability and decrease the effective length of the column,at the same time the stiffness out of plane of the beams connected with the column should be enlarged so that the ratio of line stiffness of beams to that of column meet the conditions given at the end of the paper.