Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (6): 10-16,46.

• Architecture & Civil Engineering • Previous Articles     Next Articles

Experimental Investigation into a New Type of Concrete-Filled Steel Tubular Column-Beam Joint with the Discontinuous Column Tube in Joint Zone Under Compression

Chen Qing-jun 1.2  CaiJian1  Xu Gang3  Wu Yi4   

  1. 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Key Laboratory of Subtropical Architecture of the Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China; 3. The Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, Guangdong, China; 4. School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, China
  • Received:2007-05-23 Revised:2007-10-24 Online:2008-06-25 Published:2008-06-25
  • Contact: 陈庆军（1975-），男，博士生，讲师，主要从事钢-混凝土组合结构、结构仿真分析等研究． E-mail:qjchen@scut．edu．cn
  • About author:陈庆军（1975-），男，博士生，讲师，主要从事钢-混凝土组合结构、结构仿真分析等研究．
  • Supported by:

    广东省自然科学基金资助项目（020965）;广州市教育局科技项目（62063）;华南理工大学青年自然科学基金资助项目（304-E5040510）

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Abstract:

In this paper, the experiments of the concrete-filled steel tubular （CFST） column-beam joints with discontinuous column tube in the joint zone were carried out with 7 axial and 2 eccentric compressive specimens. The mechanical performances of two types of joints, including the failure mode, the crack load, the ultimate bearing capacity, the structural deformation and the strains of ring bars, steel tubes and longitudinal bars, were then investigated. In the joint of Type 1, the columns were separated on each floor, while in Type 2, the openings were cut on the column tube at the corresponding beam place. The results show that （ 1 ） under the constraint of concrete ringbeams and ring bars, the joints are of good ductility and high bearing capacity ; （2） the two types of joints have the same failure mode and similar mechanical performances; （3） both the ultimate bearing capacity and the strain of eccentric compressive specimens decrease with the increase of the eccentricity ; （4） the strains of the ring bars of eccentric compressive specimens tend to decrease from the tension side to the compression side, thus resulting inasymmetric constraints ; and （5） the strains of longitudinal column bars tend to decrease from the joint zone to the ends of the column.

Key words: concrete-filled steel tubular column, column-beam joint, discontinuous steel tube, mechanical performance