Flexural Strength of Partially Concrete-Filled Steel Tubes Subjected to Lateral Loads by Experimental Testing and Finite Element Modelling

In this paper, the flexural strength and buckling of partially concrete-filled steel tubes (PCFST) under laterally repeated loads was investigated through three-point bending test configuration. Three-dimensional Finite Element (FE) models tests PCFST were developed, in which concrete filling modelled using elastic-plastic-fracture model capturing crack development tube elastic-plasticity model. The bond between considered as frictional touching contact. validation showed FE results including ultimate load failure mode excellent agreement with experimental ones. A parametric study then conducted verified to investigate effects diameter-to-thickness ratio, length compressive concrete, steel’s yield tensile strengths on PCFST’s strength. Based study, modes, optimal lengths, confined determined considering all these parameters. stresses strains predicted by evaluated against those theoretical models. revealed that capacity insignificant while increasing ratio or could significantly increase concrete; there an at about 66% length. It demonstrated analysis can therefore be used a powerful method design columns lateral loads.