Temperature Field Simulation And Thermal Analysis Of GFRP Reinforced Concrete Column Under High Temperature

Compared with the reinforcement,GFRP has the characteristics of corrosion resistance,light weight,high strength,anti fatigue and so on.In the aspect of structure corrosion,GFRP can replace steel bars,and can effectively solve the problem of durability of concrete structures due to corrosion,so as to prolong the service life of concrete structures.Fire is a very important kind of disaster in human life,fire is devastating,so the research on fire resistance of concrete structures can not be ignored.At present,a lot of experiments and theoretical studies have been carried out at home and abroad in the aspects of bond slip,structural strength and fatigue of GFRP reinforced concrete,while the mechanical properties of GFRP reinforced concrete structures under fire at high temperatures are not very rich.Therefore,it is necessary to study the anti fire performance of GFRP reinforced concrete structures.The research in this field is also good for the construction of fire codes for concrete structures and can be used to guide the engineering application.It is due to the high cost of the equipment and the requirement of the equipment cost in the research of the anti fire performance of GFRP reinforced concrete structures,and there are some dangers,so the finite element simulation method has important significance for the research of GFRP reinforced concrete structure.In this paper,a large finite element analysis software ABAQUS is used to simulate the GFRP reinforced concrete column.The main research contents include the following aspects:1)The mechanical properties of the two materials of GFRP and concrete are described,and the mechanical properties of GFRP and concrete under normal temperature are compared;2)Using ABAQUS software to analyze the temperature field of GFRP reinforced concrete column,the influence of the temperature field of the GFRP reinforced concrete column is analyzed by the heating curve,the number of the fire surface,the time of the fire and the section size;3)On the basis of the analysis of the cross section temperature field of GFRP reinforced concrete column,the mechanical properties of GFRP reinforced concrete columns under monotonic loading are studied by thermal analysis of ABAQUS software.And the effect of tempera ture,ratio of reinforcement,section size and the high temperature mechanical properties of GFRP reinforced concrete columns subjected to fire were analyzed;4)The detection and identification of GFRP reinforced concrete structures after fire and the reinforcement methods are summarized and the problems in the construction of the structure after fire are pointed out.