Abstract
This paper proposes a novel full-scale square tubular-UHPFRC grouted connection for precast column-column connections. This study examines the mechanical properties of four full-scale square tubular columns fully-grouted or partially-grouted with UHPFRC via experimental and theoretical studies. The experimental program explores the ultimate resistance and failure modes of the grouted connection under axial compressive and tensile loads. The test results show that new column-column connections perform well in its resistance and stiffness while three main failure patterns include punching shear failure of end plate, welding fracture and local buckling of steel tube are observed. The theoretical model on resistance prediction explains the failure mechanisms of new connection well and it is instructive for the detail design of such novel grouted connection.
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