JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2013 Vol.14 No.12 P.880-889

Behavior of axially loaded tubular X-joints using bolted connection: mechanical model and validation*

Author(s): Yong Chen¹, Ji-yang Wang¹, Yong Guo², Guo-hui Shen¹, Li-xian Yang¹, Bin-nan Sun¹
Affiliation(s): 1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; more
Corresponding email(s): Kyotowang@zju.edu.cn
Key Words: Steel tubular X-joint, Bolted connection, Annular plate, Gusset plate, Strength capacity

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Abstract: X-joints are one of the fundamental joint configurations used in a wide range of transmission tubular structures. Experimental investigation of four tubular X-joints with bolted connection was conducted in this study, and it was found that the annular plate was the main yielding control member of such X-joints. Moreover, the portion outside the effective width of the chord member still had a restriction effect on the annular plate, which led to reducing the yielding strength of the joint, while the gusset plate could help to improve the yield strength capacity. In the current design code of steel structures, the contribution to the strength capacity of the gusset plate has not been taken into account. Therefore, based on some mechanical assumptions, a general mechanical model was proposed. After the introduction of the gusset plate strength capacity factor, the yield capacity simplified calculation method of such X-joints was derived. Through the analyses of such X-joints with various diameters and thicknesses, it was concluded that a simple mechanical model could predict test results very well and that the contribution of the gusset plate was also taken into account.

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