敬登虎，  刘旭东，  曹双寅
   （东南大学土木工程学院，南京 2100960

[摘要] 对于钢筋混凝土( RC)框架结构，在地震发生时框架底层RC柱易发生纵向受力钢筋局部屈曲与受压区混凝土压碎。为了改善RC柱的抗震性能，提出一种端部成束筒约束的新型RC柱设计理念。通过4根成束筒约束方形截面RC柱的轴心受压试验研究，结果表明成束筒约束RC柱的残余承载力与变形能力均得到有效提高，但是其峰值承载力下降了近30%。
[关键词] 成束筒约束；RC柱；强度；延性
中图分类号：TU375.3    文献标识码：A  文章编号：1002-848X(2012) Sl-0762-04

RC column with bundle confinement tube at ends
Jing Denghu, Liu Xudong, Cao Shuangyin
( School of Civil Engineering, Southeast University, Nanjing 210096, China)

Abstract:  For reinforced concrete frames subjected to seismic action, the base reinforced columns are prone to occur local buckling of steel bars and crushed concrete. In order to improve the mechanical behavior of seisnuc performance of RC column, a new design concept conceming RC column with bundle confinement tube at its ends was put forward. Four RC columns with bundle confinement tube at ends were investigated under axial compression. The results show residua lload carrying capacity and deformation capacity of this kind of RC column with bundle confinement tube, compared to the RC column without that, are effectively improved, but the peak load decreases by about 30 percent.
Keywords: bundle confinement tube; RC column; strength; ductility