钢筋混凝土分体柱在侧向荷载作用下的弹塑性分析

Elastic-plastic analyse of reinforced concrete split columns under lateral force

高层结构由于竖向荷载大,底层柱截面往往很大,容易形成短柱。分体柱就是将一根截面较大的柱剖分为若干截面较小的柱,以增加柱的长细比,从而避免出现短柱,但由于对分体柱的力学性能了解不多,工程中鲜有应用。本文应用有限元法对某高层结构的底层角柱进行了弹塑性分析,分别讨论了分体柱在竖向和侧向荷载作用下的力学性能。结果表明,在竖向力的作用下,整体柱与分体柱的轴向变形相差不大,分体柱的侧向承载能力比整体柱略有降低,但延性却大幅度提高。可见,采用分体柱可以在保证柱承载力满足要求的前提下,大大提高柱的延性。

Because of big vertical load,the bottom column of high rising building is often has a huge cross-section and easy to form short column.Split column is to divide a large cross-section column into a number of smaller cross-section columns,so as to increase the slenderness ratio and avoid forming short column,however,because of lacking of research about its mechanics properties,split column has not been used in practical until now.This paper analyses the elastic-plastic properties of split column using finite element and compares their mechanics capabilities under vertical load and horizontal load.The results show that under vertical load,the axial deformation difference is small,split column lateral load capacity slightly lower than the overall column,however,its ductility is substantially increases.Thus using split column can greatly enhance the ductility under the premise of carrying capacity meets the requirements.