Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (6): 77-83.doi: 10.3969/j.issn.1000-565X.2013.06.013

• Architecture & Civil Engineering • Previous Articles     Next Articles

Bearing Mechanism of Doubling Plate- Reinforced Square Tubular T- Joints Under Compression

Chang Hong- fei1,2 Xia Jun- wu1,2 Chang Hong1 Yu Guang- dong1,3   

  1. 1.Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,China University of Mining andTechnology,Xuzhou 221008,Jiangsu,China; 2.Xuwei New District Hi- Tech Research Institute,China University of Mining andTechnology,Lianyungang 222065,Jiangsu,China; 3.Jiangsu Institute of Architectural Technology,Xuzhou 221116,Jiangsu,China
  • Received:2012-10-23 Revised:2013-01-21 Online:2013-06-25 Published:2013-05-03
  • Contact: 常鸿飞(1982-)，男，博士生，讲师，主要从事钢结构抗震减灾研究． E-mail:honfee@126.com
  • About author:常鸿飞(1982-)，男，博士生，讲师，主要从事钢结构抗震减灾研究．
  • Supported by:

    国家自然科学基金资助项目(51274192);江苏省研究生科研创新计划项目(CX10B-139Z);江苏省土木工程研究生科技创新基金资助项目(CEI10-09);中国矿业大学中央高校基本科研业务费专项资金资助项目(2011QNB17);江苏省优势学科建设工程资助项目

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Abstract:

In order to reveal the bearing mechanism of doubling plate- reinforced square tubular joints under axial compression,monotonic loading tests of the joints were carried out,and the failure modes as well as the load-deformation curves of the specimens were analyzed.Then,a finite element model of the joints was constructed,and the corresponding model parameters were analyzed,through which the reinforcement mechanism of doubling plate for joints was revealed.Moreover,the formulas of bearing capacity of doubling plate- reinforced joints were deduced based on the yield line method,and some design proposals were suggested for the doubling plate reinforce-ment.The results show that (1) the compression capacity of the joint significantly improves with the thickness of the doubling plate but changes a little with the plate width and length; (2) the reinforcement ratio of doubling plate increases with the decrease in brace- chord width ratio β; (3) the doubling plate improves the compression capacity by yielding together with the chord flange; (4) when β≥0.8 or when the plate thickness exceeds a certain range,the yield of doubling plate may be incomplete due to the buckling of chord web; and (5) the deduced design formulas accord well with the results of experiments and parameter analyses.

Key words: square steel tubular, doubling plate- reinforced joint, bearing mechanism, compressive capacity

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