Strength Research On The Concrete Filled Steel Tube Short Column Subjected To Axial Compression Loading

Concrete-filled steel tube composed of the steel and concrete is a composite structure. Within the loading process of concrete-filled steel tube, the advantages of the steel and the concretes can be fully utilized, and the disadvantages of two materials are overcome simultaneously. Therefore, concrete filled steel tube has unique characteristics: high bearing capacity, fine performance of plasticity and toughness, well anti-seismic behavior, convenient construction, well fire-resistant and corrosion resistance performance, and obvious economic effects, which is determined to be widely used in engineering.The theoretical analysis and numerical simulation of the load-carrying capacity and fire resistance performance of the concrete-filled tubular subjected to axial compression load are carried out. The main contents are as follows.1.Analyzed the concrete filled steel under the different load way and the hoop coefficient work mechanism and the performance. Listed the calculating formula of the ultimate bearing capacity to concrete filled steel tubular short column axial compression in different countries. The experimental data in literature were compared. The results showed that the calculated values were generally lower than the experimental value. Simultaneously,load-carrying capacity of the specimens is going up if the confining factor increases.2.The finite element model of concrete filled steel tube under axial compression was constructed and simulated by ANSYS.A comparison of load curve between experimental data and ANSYS simulation results was carried. The results showed that the whole process of their specimens of there stages, including elastic stage elastic–plastic stage and failure, simulation results agreed with the experiment results. It shows that the finite element model based on ANSYS is accurate and feasible3.The eccentricity and the fire resistance of different cross-sections were calculated based on the thermal characteristics parameters and constitutive relationship of the two materials. Furthermore, the experimental data was compared with those in literature.