Testing and Analysis of Concrete-Filled Square Hollow Section Stub Columns with Perfobond Leister Rib

Abstract

Perfobond Leister Rib (PBR) is found to improve the bond strength in concrete-filled hollow section and the capacity of the steel plate to resist local buckling. An experimental investigation of 12 test specimens is firstly carried out on the behavior of concrete-filled square hollow section CFSHS) stub columns with PBR. To examine different mechanical behaviors of the columns utilized in bridge or building structure, different loading methods are investigated; e.g., loading through steel alone, loading through concrete alone and loading through the whole cross section. The failure mode, strain distribution, ultimate strength and the confinement of the concrete core offered by the steel tube are studied. The test results showed that CFSHS tubular columns with PBR are emulative of the conventional columns. PBR can make the steel tube and filled-in concrete work together, which results in the axial load shared by hollow steel section and filled-in concrete section regardless of loading through steel or concrete alone. The axial strain distribution model of steel tube section along the height for CFSHS with PBR is proposed.

Experimental and numerical studies on mechanical behavior of stiffened concrete‐filled square steel tube columns subjected to axial compression

“…Nevertheless, under longitudinal and radial stress, the walls of SCFST are susceptible to local buckling, thus weakening the confinement effect of the steel tube on core concrete, which leads to a reduction in the bearing capacity, especially when the wall widthto-thickness ratio (B/t) is comparatively high. 1,2 In response to this problem, researchers [3][4][5][6][7][8][9][10][11] found that setting longitudinal stiffeners in the tube wall can effectively restrict the local buckling and increase the bearing capacity and ductility.…”

“…Additionally, the finite element models were in good agreement with the experimental results. Cheng, 11 proposing a Perfoband Leister Rib (PLR) of longitudinal stiffeners, fabricated 12 square steel tube concrete columns and completed axial compression experiments under different conditions. The results demonstrated that the PLR could substantially increase the bearing capacity and make concrete and square tubes work together well.…”