Abstract
In previous research, the flower-gusset composite joint (FGC joint), which can replace traditional gusset joints, was proposed. The results of previous tests and numerical analysis show that the effect of the axial force and bolt clearance on the semi-rigid performance of FGC joints cannot be ignored. In this paper, the M-θ model of FGC joints considering the effect of the axial force and bolt clearance is proposed through theoretical analysis and test verification. First, the corresponding assumptions are proposed based on the effect of the axial force and bolt clearance on the semi-rigid performance of FGC joints. Second, the calculation formulas of the M-θ model of the FGC joint are proposed through theoretical analysis. The calculation formulas are modified by many numerical analysis results. Then, two groups of bending tests on FGC joints under different axial forces and bolt clearances are completed, and the M-θ curve of FGC joints is obtained. Finally, the M-θ curves from the tests are compared with the calculation results of the M-θ model, which show that they are very similar. Therefore, the proposed M-θ model in this paper can fully consider the effect of the axial force and bolt clearance.
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