Research On Fire Endurance Of Steel Reinforced Concrete Columns

Steel reinforced concrete column refers to the structure which main composition of section steels,as well as the longitudinal reinforced steel and horizontal stirrups,and the concrete components.It is a major form of steel-concrete structure.Compared with the reinforced concrete column,the steel reinforced concrete column has advantages of rigidity,ductility,bearing capacity,seismic performance and construction period.Compared with the steel structure,the steel reinforced concrete structure has advantages of fire resistance,corrosion resistance and economic benefits.With the social progress and economic development,the increasing use of steel reinforced concrete in the high-rise buildings and other applications is remarkable.At present,architecture fire has become the primary disaster prevention,and the steel reinforced concrete column is the key factor,which determines the collapse of the structure under the fire.Therefore,it is of great practical significance to study the fire resistance of steel reinforced concrete columns.Based on the development and research status about steel reinforced concrete columns at home and abroad,the ABAQUS finite element simulation and parameter analysis of SRC columns are carried out in this paper.The detail works are as follows:(1)Systematically summarized the research and the calculation methods of temperature field of SRC columns at home and abroad.(2)The theoretical calculation formula of the bearing capacity of steel reinforced concrete columns under external load is explained,which lays a theoretical foundation for the study of the influence of axial compression ratio.(3)The introduction about model,boundary conditions,reinforcement and size of the steel reinforced concrete column.The temperature-dependent curve of ISO-834 is used to load the temperature,and the thermal parameters and constitutive relation of the material are selected rationally.(4)Based on the ABAQUS software,the numerical analysis of the temperature field about the concrete column[30] is carried out,and the temperature field profile of the SRC columns and the column axial deformation value are obtained.Compare the numerical result with the experimental result and analyze the effects of load eccentricity and section type ofsteel(I-shaped and cross-shaped steel)on fire resistance.(5)Using the validated model,set the load ratio as a variable to study the effect on the fire resistance limit.(6)Combined the numerical simulation with the experimental study,sum up the temperature field distribution and fire endurance of the H-shaped of steel reinforced concrete column and make a prospect.