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The punching shear failure often governs the strength of the footing-to-column connection. The punching shear failure is an undesirable failure mode, since it results in a brittle failure of the footing. In this study, a new method to increase the strength and ductility of the footing was proposed by inserting the punching shear preventers (PSPs) into the footing. The validation and effectiveness of PSP were verified through a series of experimental studies. The nonlinear finite element analysis was then performed to demonstrate the failure mechanism of the footing with PSPs in depth and to investigate the key parameters that affect the behavior of the footing with PSPs. Finally, the design recommendations for the footing with PSPs were suggested.

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The research reported herein investigated the behavior of gapped K-connections comprising square hollow structural sections (HSS) for a chord and a compression branch, a high-strength tensile rod for a tension branch, and a pair of longitudinal plates separated by distance for a connecting element. The main experimental parameters for 12 specimens were the width-to-thickness ratio of the chord (2γ) with 16.7 ≤ 2γ ≤ 33.3, the width ratio between the compression branch and the chord (ß1) with 0.5 ≤ ß1 ≤ 0.875, and the width ratio between the tension branch to the chord (ß2) with 0.42 ≤ ß2 ≤ 0.82. Experimental results showed that the general failure mode was a combination of chord plastification and punching shear. It was also found that the width ratio between the tension branch and the chord (ß2) has a greater effect on the connection strength. Since there was no equation in CIDECT that could be used to estimate the strength of the connections tested in this study, a new equation was proposed from the yield line analysis.