T-head Square-neck One-side Bolt (TSOB) is a novel fastener, which can be used for the connection of Square Hollow Steel (SHS) members, with its simple construction, easy installation, no additional aids, can adapt to the rough installation manners in construction site, and has a large application potential. However, the current research on the performance of TSOBs bolted connections is mostly for model tests, the parameters of the research is single, lack of sufficient data support. In this paper, a three-dimensional nonlinear Finite Element (FE) model of TSOBs bolted beam-column joint was established by the ABAQUS FE analysis software, and the structural performance was further evaluated. The results of FE analysis were used to reveal the key structural response mechanism of this type of connections, and the effects of parameters such as the installation gap between the strengthening component and the Steel Hollow Section (SHS) column, the cross-section of the strengthening component, and the splicing position of the connection on the joints structural performance were investigated. The results showed that the three-dimensional FE model of TSOBs bolted beam-column joints established in this paper could accurately predict the failure mode of the joint under monotonous loading, the stress state of the components and the yielding sequence, obtaining the rotation-moment curve with high agreement with the experimental results, which was highly accurate and reliable, and provided a reliable way to analyze the working mechanism, parametric research and structural performance assessment. The load transfer path of the H-steel component in the SHS column was clear and simple, the material properties were fully utilized, and the working efficiency of the H-steel component was high, which was an ideal section for strengthening components. It was recommended that the installation clearance between the strengthening component and the SHS column should not exceed 2.0 mm. The load transfer path of cross-section component in planar joints was the same as that of the H-steel component, which should be designed separately in space joints according to the H-steel component in two directions and could not transfer the load between adjacent walls of the SHS column. The novel component formed by external welding of the short SHS in the middle section of the H-steel component could reduce the visual dislocation of the SHS columns without affecting the mechanical properties of the joints, and improve the hoisting efficiency of on-site lifting equipment and the installation efficiency of joints. In the strengthened joints, the splice of the SHS columns should be preferentially designed at the beam flanges.
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