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.
Base on the existing condition that the bearing capacity is insufficient of some aging reinforced concrete (RC) members with axial tension, the formula for calculating the tensile capacity of the RC members strengthened with externally bonded carbon fiber reinforced plastic (CFRP) sheets is deduced and experiments of 8 RC members are conducted to examine the influences of CFRP sheets on the cracking load and ultimate load of the RC members. The calculation formulas agree with the experimental data and give the reference to the practical projects. The study is instructive and useful in strengthening of RC members with externally bonded CFRP sheets under axial tension.
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