Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (3): 128-133.

• Architecture & Civil Engineering • Previous Articles     Next Articles

Experimental Study on Long-Span Concrete-Filled Rectangular Steel Tubular Truss with Cantilevers

Yang Chun1  Cai Jian1  Chen Guo-dong1  Luo Qi-zhi2  Zuo Zhi-liang1   

  1. 1.School of Architecture and Civil Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Foshan University, Foshan 528000, Guangdong, China
  • Received:2007-06-26 Revised:2007-09-30 Online:2008-03-25 Published:2008-03-25
  • Contact: 杨春（1973-），男，博士，讲师，主要从事钢-混凝土组合结构研究． E-mail:chyang@scut．edu．cn
  • About author:杨春（1973-），男，博士，讲师，主要从事钢-混凝土组合结构研究．

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Abstract:

Concrete-filled rectangular steel tubular （CFRST） truss is suitable for long-span structures because it possesses excellent mechanical properties due to the concrete-filled steel tube. In this paper, the experiments of two large specimens were performed to make a comparison between the CFRST truss with cantilever and the rectangular steel tubular （RST） truss. The destruction mode, deformation and ultimate strength of the CFRST truss were then investigated. Experimental results show that, as compared with the RST truss, the CFRST truss is of higher stiffness, ultimate strength and smaller deformation. The filled concrete can effectively prevent the steel tube from locally buckling, and the destruction mode of the specimens is controlled by material strength. The moments of the chord members and the web members at the joints where the members are connected by direct welding are quite large, so that the effect of the moments on the ultimate strength of the joints cannot be ignored in engineering design.

Key words: concrete-filled rectangular steel tube, truss, long span, mechanical property