The Study On Shear Bearing Capatity Of The Reinforced Concrete Beams After Fire

Structure fire resistant structure has become a hot field of disaster prevention and mitigation studies. Reinforced concrete beams, as one of the common elements of reinforced concrete structures, once destroyed by the fire would jeopardize the building structure and the safety of human life. In the bearing capacity of reinforced concrete beams, the oblique section shear capacity is the key to preventing brittle shear failure of the beam. Therefore, to have important practical significance Shear bearing capacity of reinforced concrete beams after research on the role of fire.In this paper, reinforced concrete simply supported beam, analyzed and studied different oblique section shear capacity remaining after the fire by the time the role of reinforced concrete Charpy method of calculation and use ABAQUS finite element analysis software for the simulation of contrast. The main contents and results are as follows:(1) analyzes and summarizes the foreign experts for steel and concrete materials research in major thermal mechanical properties of high temperature after the fire.(2) based on ISO834standards proposed by the International Organization for Standardization heating and cooling curve analysis after the reinforced concrete simply supported beam model of three-sided role in the case by the fire, three and four, naturally cooled to room temperature, the distribution of temperature field and the cross-section variation.(3) based on the equivalent section method to analyze the damage mechanism of reinforced concrete Charpy high temperature after the fire, made after a fire condition to fire on three sides by natural cooling to room temperature, the role of the residual shear capacity Beams practical calculation methods, and ABAQUS simulation results were compared with good agreement.