Abstract
In this study, three circular hollow sections (CHS) tubular X-joints strengthened with different external stiffeners or not were investigated by experimental and nonlinear finite element anlaysis (FEA) to study the bearing capacities, failure modes, and the strengthening effect of joint-plates. The test results showed that the bearing capacity of the X-joints could be improved by using the stiffened joint-plate, and the joint failure process was delayed, and the cambered surface of chord was straightened by tensile braces. Compared with the tested results, the nonlinear FEA could simulate the failure modes and its bearing capacity behavior of steel tubular X-joints well. To estimate the contribution of joint-plates on bearing capacity, four kinds of parameters were selected, and the corresponding FEA of stiffened X-joint were performed. Then, the influencing law on bearing capacity of different parameters was investigated. According to the superposition method of bearing capacities, the annular calculation model and the multi-parameter calculation theory of stiffened circular steel tubular X-joints were proposed, in which the coefficients were determined through regression analysis. Lastly, the comparisons on tested, simulated, and theoretical bearing capacities of stiffened X-joints were carried out, and there had good agreement between them.
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Abbreviations
- D :
-
Chord diameter
- D i :
-
Brace diameter
- f :
-
Strength design value of steel
- f y :
-
Yield steel strength
- h 1 :
-
Stiffener height
- l 0 :
-
Chord length
- l 1 :
-
Brace length
- N bu :
-
Contribution of stiffeners to bearing capacity
- N u :
-
The axial tension capacity of X-joints stiffened with external joint-plates
- N wu :
-
Bearing capacity of un-stiffened X-joints
- t :
-
Chord wall thickness
- t i :
-
Brace wall thickness
- t s :
-
Stiffener wall thickness
- β :
-
Brace-chord diameter ratio Di/D
- γ D :
-
Chord diameter-thickness ratio D/t
- γ Di :
-
Brace diameter-thickness ratio Di/ti
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51678293).
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Gao, C., Zhang, D., Cui, M. et al. Bearing Capacity Test and Calculation Theory on CHS X-Joints Stiffened with Joint-Plates. KSCE J Civ Eng 26, 848–864 (2022). https://doi.org/10.1007/s12205-021-0813-3
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DOI: https://doi.org/10.1007/s12205-021-0813-3