等面积异形柱与矩形柱多层框架的结构性能对比分析

Contrast analysis on structure performance of multi-story frames with equal-area special shaped columns or rectangular columns

为研究当框架柱截面面积相等时,采用异形柱和矩形柱对结构性能的影响,结合某6层框架住宅建筑,在保证同一位置处的异形柱与矩形柱截面面积相等的条件下,运用结构设计软件SATWE分别进行矩形柱框架和异形柱框架的结构设计,对这2种结构进行了地震作用下的层间位移角、楼层最大位移、楼层剪力、剪重比以及结构自振周期、振型等抗震性能的对比分析;根据规范选取了3条地震波,分别运用SATWE和EPDA软件对这2种结构进行弹性和弹塑性时程分析;从钢筋用量的角度进行了经济性的对比分析。结果表明,当框架柱截面面积相等时,和矩形柱框架相比,异形柱框架的抗震性能较好,但经济性稍差一些。研究结果为不同条件下异形柱与矩形柱的选用提供了理论参考。

In order to study the effect of using special-shaped column and rectangular column on the structure performance under the condition of equal cross section area of columns,combined with a six layer frame residential buildings,the structure design software SATWE is used for the structure design of special-shaped column frame structure and rectangular columns frame structure. In the two kinds of structure,section area of both special-shaped column and rectangular column in the same location is equal. The seismic performances of the two kinds of structures under seismic load are analyzed,such as interlayer displacement angle,floor maximum displacement,floor shear,shear-weight ratio,natural vibration period,vibration mode,etc. According to the specification,three seismic waves are chosen for elastic and elastic-plastic time history analysis of the two kinds of structure respectively using software SATWE and EPDA. The economy is also analyzed from the perspective of the amount of reinforcement steel bar. Analysis results show that when section area of frame column is equal,special-shaped column frame structure has better seismic performance than rectangular columns frame structure,but the economy is a bit poor. The study results provide theoretical reference for the special-shaped column and rectangular column selection under different conditions.