| The bending and shear capacity of reinforced concrete frame beams are seriously damaged after fire, which influences the whole performance of the structure. At present,the tests and finite element simulation of reinforced concrete frame beams after fire are focused on bending behavior, rarely involving the shear properties. Therefore, research on shear capacity of reinforced concrete frame beams after fire is conducted in this paper,and twelve models of reinforced concrete frame beams are simulated by using finite element software ABAQUS. It analyzes the distribution of the temperature field, and researches the shear capacity of reinforced concrete frame beams after fire under different working conditions. The main research work as follows:1)It summarizes the fire tests and finite element analysis results of documents and books at home and abroad. The thermal property and mechanical property of steel and concrete under fire and after fire are simply introduced. It provides important basis for the study of shear performance of reinforced concrete frame beams after fire.2) It studies each section temperature field of the beam under fire by using ABAQUS software. The results are including the section temperature clouds in different time and the deflection of the beam under fire.3) The thermal stress coupling analysis of reinforced concrete frame beams is analyzed by using ABAQUS software after fire. The results are including the relationship between the deflection and load after fire. It analyzes the influence of shear performance with different stirrup ratio, shear span ratio, concrete strength and the fire duration of reinforced concrete frame beams after fire. It provides theory basis for the reinforced concrete frame beam after fire of strengthen and solid. |
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