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   敬登虎，  劉旭東，  曹雙寅
   （東南大學(xué)土木工程學(xué)院，南京 2100960

[摘要] 對(duì)于鋼筋混凝土( RC)框架結(jié)構(gòu)，在地震發(fā)生時(shí)框架底層RC柱易發(fā)生縱向受力鋼筋局部屈曲與受壓區(qū)混凝土壓碎。為了改善RC柱的抗震性能，提出一種端部成束筒約束的新型RC柱設(shè)計(jì)理念。通過(guò)4根成束筒約束方形截面RC柱的軸心受壓試驗(yàn)研究，結(jié)果表明成束筒約束RC柱的殘余承載力與變形能力均得到有效提高，但是其峰值承載力下降了近30%。
[關(guān)鍵詞] 成束筒約束；RC柱；強(qiáng)度；延性
中圖分類號(hào)：TU375.3    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：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