To verify the validity of the finite element models of the composite columns, the simulation results were compared with the existing experimental results, and good agreement was achieved. In this study, the mechanical behaviors of SRSCFSHS columns were numerically investigated with the software of ABAQUS/standard solver. Based on the numerical analysis, a formula for predicting the capacity of eccentrically-loaded columns is suggested.ĭue to high load carrying capacity and convenience of designing column-beam connections, steel-reinforced square concrete-filled steel hollow section (SRSCFSHS) columns have been increasingly employed in the structural engineering. The primary parameters influencing the bearing capacity were investigated. The experimental results agree well with analyses using a nonlinear program developed by using fiber model method. Loading direction has little effect on bearing capacity and initial stiffness. The increase of steel-reinforced ratios results in the bearing capacity and initial stiffness rise gradually. The increment of eccentricity ratio leads to the decrement of both the bearing capacity and the initial stiffness. The experimental results show that the bearing capacity decreases slowly and the initial stiffness decays sharply with the increase of the slenderness ratios. Faigure modes and mechanical properties were studied corresponding to different parameters such as slenderness ratios, eccentricity ratios, steel-reinforced ratios and loading direction. An experimental research of 10 square steel tube columns filled with steel-reinforced high-strength concrete subjected to eccentric loading was carried out.
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