Abstract
The static performance of the multi-planar concrete-filled steel tubular (CFST) chord-circular hollow section (CHS) brace TT (CFST-TT) joint is investigated using theoretical and finite element analysis (FEA). The joint ultimate bearing capacity is the minimum strength of each member to ensure that the joint will not fail under any loads. Accordingly, the strength calculation formulas for joints are proposed based on the failure mechanism. FEA models verified by experiments were established to obtain the joint bearing capacity and failure modes, and further analysis was done to find the effects of geometrical parameters, material strength, and the axial compression ratio. The results show that the joint bearing capacity increased with the increase of brace-to-chord diameter ratio (β) and steel yield strength of the chord (fy) but decreased with the increase of the chord diameter-to-thickness ratio (γ). However, the concrete compressive strength (fcu), the brace-to-chord thickness ratio (τ), the angle between two braces (Ф), and the axial compression ratio (n) almost have no effect on the joint bearing capacity. The proposed ultimate bearing capacity formula is validated using FEA. The optimized formula is proposed to simplify the theoretical calculation formula and make the results more consistent with the FEA results.
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