Abstract
Experimental research and numerical analysis were applied to study the ultimate load capacity (ULC) and reinforcement of circular-hollow-section N-joint. Four specimens were tested under static load. The ULC of each specimen was obtained and the detailed failure conditions were discussed. Based on the results, both welding a plate on the chord member and filling concrete in the chord member are effective to reinforce the N-joint, but it is suggested that these two methods should not be applied simultaneously. Moreover, considering the four important influence factors of ULC of the joints, the ratio of chord diameter to chord thickness, the ratio of diagonal member diameter to chord member diameter, the axial load on the chord member and the gap size between the two brace members, a new prediction formula of ULC of N-joint was put forward based on numerical analysis results. The new formula was proved to be more accurate than the current Chinese design code in a wide range.
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References
Kurobane Y. Ultimate resistance of unstiffened tubular joints[J]. Journal of Structural Engineering, 1984, 106(2): 385–400.
Makino Y, Kurobane Y, Ochi K et al. Database of Test and Numerical Analysis Results for Unstiffened Tubular Joints[R]. IIW Doc. XV-E-96-220, 1996.
Choo Y S, Qian X D, Wardenierb J. Effects of boundary conditions and chord stresses on static strength of thick-walled CHS K-joints[J]. Journal of Constructional Steel Research, 2003, 62(4): 316–328.
Shu Xingping, Zhu Shaoning, Xia Xinhong et al. Fullscale experiment research on CHS joints of steel roof of He Long Stadium in Changsha[J]. Journal of Building Structures, 2004, 25(3): 8–13(in Chinese).
Ministry of Construction of People’s Republic of China. GB50017-2003 Chinese Code for Design of Steel Structures[S]. China Planning Press, Beijing, China, 2003.
Li Zilin, Wu Liangqin, Zhu Bin et al. Experimental study of the static behavior of tubular N-joints[J]. Journal of Civil Engineering, 2008, 41(7): 48–54(in Chinese).
Yoshinaga S, Tetsuya H, Akira I et al. Experiments on concrete filled and reinforced tubular K-joints of truss girder[J]. Journal of Constructional Steel Research, 2004, 60(3–5): 683–699.
Bi Jihong, Wang Hui. Plastoelasticity in Engineering[M]. Tianjin University Press, Tianjin, China, 2003(In Chinese).
ANSYS Corporation. ANSYS Structural Analysis Guide [M]. 2004.
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Supported by National Natural Science Foundation of China (No.50608054).
HAN Qinghua, born in 1971, male, Dr, Prof.
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Han, Q., Lu, Y., Yu, B. et al. Ultimate load capacity and reinforcement of circular-hollow-section N-joint. Trans. Tianjin Univ. 16, 1–5 (2010). https://doi.org/10.1007/s12209-010-0001-x
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DOI: https://doi.org/10.1007/s12209-010-0001-x