Abstract
This paper presents the finite element (FE) analysis and modelling of square concrete-filled steel tube (CFST) members subjected to a flexural load. A parametric study is conducted using the verified FE model to study the effect of the depth-to-thickness (D/t) ratio (18.75, 25, and 30), the compressive strength of infilled concrete (60, 80, and 100 MPa), and the yield strength of the steel tube (410, 500, and 600 MPa) on the flexural behaviour of the square CFST members. Decreasing the D/t ratio (from 30 to 18.75) can significantly increase the ultimate capacity of the square CFST members (up to 25%) while having a marginal effect on the initial stiffness of the CFST members. The ultimate bending capacity of the CFST members increases by up to 55% when the yield strength of the outer steel tube increases from 410 MPa to 600 MPa. However, the flexural capacity increases by only 12% when the compressive strength of the infilled concrete increases from 60 MPa to 100 MPa, hence showing a marginal effect. Results of the parametric studies are used to assess the current design models, and Han’s model predicts the most accurate flexural capacity.
Highlights
Several researchers presented different procedures in order to study the effect of both static and dynamic loading on different composite systems [1], [2], [3]
The verification and applications of a three-dimensional finite element model developed for the nonlinear analysis of concrete-filled steel tube (CFST) square beams at ambient temperature have been presented in this paper
It has been shown that the load-deflection curves and ultimate flexure load capacity of square CFST beams predicted by the numerical model are generally in good agreement with the experiential results
Summary
Several researchers presented different procedures in order to study the effect of both static and dynamic loading on different composite systems [1], [2], [3]. Hu et al, [16] proposed material constitutive model for circular CFST columns subjected to pure bending They performed finite element analysis (FEA) and validated the theoretical results with the experimental data, and concluded that the concrete acts as ideal material to resist compressive loading in the typical applications, only when the depth-to-thickness (D/t) ratio is greater. After FEA model verification, the numerical analysis is extended to perform the parametric study like compressive strength of concrete, D/t ratio and yield strength of steel on the performance of CFST beams under flexure load. Finite element type and boundary conditions A supported hollow-steel beam filled with concrete under two-point loading is used to investigate the flexural behaviour and strength. The mean ultimate flexure strength predicted by the numerical model is 1.01 times the experimental value with a standard deviation of 0.016 and a coefficient of variation of 0.016
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