Experimental study on concrete-filled double-skin square steel tubes under compression-bending-torsion loading conditions
Huang HongZhu Qi Chen Mengcheng Li Ting
1. East China Jiaotong University, Nanchang 330013, China；
2. Jiangxi Key Laboratory of Control and Simulation of Construction Process, Nanchang 330013, China
Abstract：In this paper, totally seven specimens including two concrete filled steel square tubes and five concrete filled double-skin square steel tubes with various slenderness ratios, hollow ratios and axial force ratios were tested under compression-bending-torsion loading conditions. The torsion-rotation curves of all specimens were numerically calculated by finite element software ABAQUS. The numerical results are found to be in good agreement with test data before the load carrying capacity is obtained. The working mechanism is analyzed by parametric studies with respect to the separate carrying load of steel and concrete and the influence of axial force ratio and hollow ratio on the response of the torsion-rotation curves. The parametric study results indicate that the torsion capacity decreases with the axial force ratio. The torsion capacity and ductility increases with the hollow ratio when the eccentricity is relatively small.
