Fire Behavior Of Restrained SRC Columns With T-shaped Cross Section

Steel Reinforced Concrete(SRC) columns with special shaped cross section is a composite columns of steel and rebar embedded in concrete,generally in the form of(T、十、L)-shaped cross-section. Concrete and steel work together to make full of both advantages play, and the column limbs as thick walls can reduce the outstanding of columns, so it has been used more and more widely in modern buildings. At present, the study of steel reinforced concrete columns mainly focus on seismic performance and earthquake resistance behavior, and the study of its fire behavior is little. The area of exposed in the fire of the steel reinforced concrete special-shaped columns with the T-shaped cross section is larger than the rectangular columns which have the same section, so the fire stability of the columns with T-shaped cross section is lower than the rectangular columns. Therefore this paper carried out the research of fire resistance on three sides heating of steel reinforced concrete columns with T- shaped section, and analyzed the factors that affecting the fire resistance.The calculation method is established to figure the columns, and it can be used to calculate the fire resistance design of related components.The main contents are as following(1)By analyzing and comparing the domestic and foreign literature, the thermal parameters and constitutive relation model of concrete and steel are selected to calculate model.(2)Established restrained SRC finite element columns with T-shaped cross sections subjected to three-sides heating under standard fire,the rationality of the model was verified by experiment results of reinforced concrete columns with special shaped cross section,restrained PEC columns and reinforced concrete columns.(3)The validated model was used to analyze the failure mechanism of the restrained steel reinforced concrete columns with T-shaped cross sections subjected to three-sides heating.(4) Analysis internal force、deformation on related factors such as load ratio, eccentric ratio,axial restraint stiffness ratio,rotational restraint stiffness ratio and heating boundary.(5)Do parametric analysis of fire resistance on the factors above-mentioned.