[1] Zheng Wenzhong, Zhang Geming, Liu Xudong, Zhang Boyi, et al. Experimental research on ultimate bearing capacityof N-joints of grouted square steel tube trusses [J]. Journal of Southeast University (English Edition), 2007, 23 (4): 566-570. [doi:10.3969/j.issn.1003-7985.2007.04.018]

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Experimental research on ultimate bearing capacityof N-joints of grouted square steel tube trusses()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

23

Issue:

2007 4

Page:

566-570

Research Field:

Civil Engineering

Publishing date:

2007-12-30

Info

Title:

Experimental research on ultimate bearing capacityof N-joints of grouted square steel tube trusses

Author(s):

Zheng Wenzhong;  Zhang Geming;  Liu Xudong;  Zhang Boyi

School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China

Keywords:

N-joint;  truss made of grout-filled square steel tube;  ultimate cave-in bearing capacity;  simulation analysis

PACS:

TU393.3;TU317.1

DOI:

10.3969/j.issn.1003-7985.2007.04.018

Abstract:

Cave-in failure is apt to occur in joints of trusses made of square hollow sections. In order to turn the failure mode into a strength failure mode of joint members, the idea is proposed that the chord of the truss is grouted to increase the cave-in bearing capacity of a hollow tube chord.An experiment of eight specimens of N-joints made of grout-filled square steel tubes is performed.Based on the experimental study, the geometrical parameters of specimens are analyzed, and the effects of the confinement index ξ, the spacing between the two web members g and the ratio of side length of the vertical web member to that of the chord β on the behavior of specimens are investigated through simulation analysis by an ANSYS program.Based on the test results and simulation analyses, the mechanical properties and the failure modes of this kind of joints are analyzed and the formulae to predict the ultimate bearing capacities corresponding to different failure modes are developed. The ultimate bearing capacity of compressive N-joints is calculated in accordance with the cave-in failure mode of a chord member;the ultimate bearing capacity of tension N-joints is calculated in accordance with the punching-shear failure mode;the ultimate bearing capacity of a chord member is calculated in accordance with the shear failure mode in normal sections.

References:

[1] Zheng Wenzhong, Wang Ying, Liu Tie, et al.Thoughts and understanding of remodeling of adding storeys around existing building[J].Industrial Construction, 2005, 35(4):1-5.(in Chinese)
[2] Chen Yiyi, Li Wanqi, Zhao Xianzhong.Experimental research on single K-joint in roof truss with welded box section members used in the National Stadium[J].Journal of Building Structures, 2007, 28(2):54-58.(in Chinese)
[3] Chen Baochun, Huang Wenjin.Experimental research on ultimate load carrying capacity of truss girders made with circular tubes[J].Journal of Building Structures, 2007, 28(3):31-36.(in Chinese)
[4] Liu Yongjian, Zhou Xuhong, Zou Yinsheng.Experimental research on local bearing strength of concrete filled rectangular steel tube under transverse load[J].Journal of Building Structures, 2003, 24(2):26-31.(in Chinese)
[5] Packer J A, Henderson J E.Hollow structural section connections and trusses—a design guide[M].Toronto:Canadian Institute of Steel Construction, 1997:35-38;125-127.
[6] He Dongzhe, Wang Yuanqing, Li Shaofu.Nonlinear finite element analysis for the ultimate strength of multiplanar tubular joint[J].Engineering Mechanics, 2000, 17(4):50-55.(in Chinese)
[7] Wardenier J.Hollow sections in structural applications[M].Bouwenmet Staal, 2002:78-83.
[8] Zheng Wenzhong, Zhang Geming.Experimental research on cave-in ultimate bearing capacity of grouted-square-steel tube[J].Journal of Jinlin University:Engineering and Technology Edition, 2007, 37(4):794-798.(in Chinese)

Memo

Memo:

Biography: Zheng Wenzhong(1965—), male, doctor, professor, zhengwenzhong@hit.edu.cn.

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