Based on experimental study and stress-strain curve of the concrete confined by circular CFRP-steel tube subjected to axial load, the fiber element approach was used to analyse load-deformation curves of the concentrically compressed concrete filled circular CFRP-steel tubular stub columns, and it shows that the results predicted check well with those of the tests and are on the safe side. Influences of confinement factor of the steel tube and the that of the CFRP tube on curves were analysed. The typical load-deformation curves were proposed and it could be defined as following four stages, e.g., elasticity stage, nonlinear stage, strengthening stage and softening stage. The method presented here is suitable for load-deformation curves analysis of the concentrically compressed concrete filled steel tubular (CFST) stub columns with circular cross-section also.
This paper reports a finite element analysis of the compressive behaviour of circular inclined CFST stub columns. A set of test data were used to verify the FE modeling. Typical curves of vertical load versus longitudinal strain, stress distributions of concrete, interaction of concrete and steel tubes, as well as effects of important parameters that determine failure modes of the composite columns were investigated. The results clearly show that the FE modeling is available for predicting the capacities of the circular inclined specimens.
Concrete filled steel tube (CFST) reinforced concrete (CFSTRC) columns subjected to axial compression were experimentally investigated in this paper. A total of ten specimens were tested. The main parameters varied in the experiments were steel tube ratio and concrete strength. It was found that, under axial compression, the column ultimate strength increases with the increasing of steel tube ratio and concrete strength. The work in this paper provides a basis for the further theoretical study on the behavior of CFSTRC columns.
In this paper, a further research has been carried on mechanical properties of concrete filled steel tube reinforced concrete columns after exposure to fire. A finite element analysis (FEA) model for concrete filled steel tube reinforced concrete columns after exposure to fire under axial compression is developed by ABAQUS. The temperature of cross-section element after exposure to fire has been obtained. The FEA model of temperature field is then used to investigate the mechanism of such composite columns further. Influences of parameters on Load-bearing Capacity such as fire duration time and steel ratio were analyzed. The work in this paper provides a basis for further theoretical study on concrete filled steel tube reinforced concrete columns after exposure to fire.
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