Tensile Performance of Occlusive Bolt Connection in Load-Bearing Support and Hanger System
Ruofan Meng , Liangjie Qi , Zheng Luo , Jianyang Xue , Ke Jiang
Earthquake Engineering and Resilience ›› 2025, Vol. 4 ›› Issue (1) : 24 -40.
Tensile Performance of Occlusive Bolt Connection in Load-Bearing Support and Hanger System
The connection joints in support and hanger systems for nonstructural components are prone to serious damage under vertical loads (including heavy pipeline gravity and vertical seismic actions), which poses an adverse impact on life safety and results in substantial property loss. Occlusive bolt connection, as one of the most frequently used connection types in load-bearing support and hanger systems, plays a critical role in determining the overall strength and stability of these systems. The cyclic and monotonic tests were conducted on occlusive bolt connections using cold-formed thin-walled channels to investigate the influence of different cross-sectional types and thicknesses. Different failure modes were observed under vertical loads, and the variation patterns of strength, stiffness degradation, strength degradation, and cyclic energy dissipation capacity of the connections were analyzed. Moreover, a refined finite element model and the formula for calculating the tensile yield load of the occlusive connection were established and verified, showing that the main failure types of occlusive bolt connection are tearing failure and shear failure at rolled edges. The tensile strength of the connection increases in two stages: the first stage is represented by the bending of the rolled edge corner, and the second stage is the tension of the upper flange. The yield strength can be effectively enhanced by increasing the thickness of cold-formed thin-walled channels and the edge distance of the channel nut, but it eventually stabilizes beyond a certain value. Furthermore, increasing the strength of channels shall further increase the yield strength and peak strength of the occlusive bolt connection.
cyclic test / load-bearing support and hanger system / nonstructural component / occlusive bolt connection / tensile performance
2024 Tianjin University and John Wiley & Sons Australia, Ltd.
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