STRENGTH OF MULTIPLANAR LONGITUDINAL PLATE-TO-CIRCULAR HOLLOW SECTION (CHS) CONNECTIONS REINFORCED BY EXTERNAL RING STIFFENERS
Ziye Yang1, Hongzhou Deng1*, Chao Li1 and Xing Ma2
1Department of Structural Engineering, Tongji University, Shanghai, China
2School of Natural and Built Environments, University of South Australia, Adelaide, Australia
In this paper, finite element (FE) analysis is carried out to investigate the behavior and strength of multiplanar longitudinal plate-to-circular hollow section (CHS) connections reinforced by external ring stiffeners (abbreviated as MCE connections) under in-plane and out-of-plane bending moments. Local plastic deformation and axial local buckling are observed from the study. Further analysis reveals that the ring stiffener can achieve effective strengthening for such connections and the failure modes are affected by the size of the ring. The capacity of the stiffened connection is increased by three times larger than that of the unstiffened connection, and the failure mode alters from local plastic deformation to axial buckling with the increase of the dimension of the ring. Parametric study is performed to cover a wide range of parameters. The study involves 364 numerical modes with different parameters such as: chord diameter-to-thickness ratio (2γ), ring stiffener width-to-chord diameter ratio (β), ring stiffener thickness-to-chord diameter ratio (η) and chord utilization ratio (n). Accordingly, a set of design formulas is proposed using nonlinear regression analysis, and the formula is compared with the FE results. The results reveal that the proposed formula has practical significance and can provide references for the design of similar connections.
Multiplanar plate-to-CHS connections; Bending moment; Gusset plate; External ring stiffener; Finite element; Design equation