The Fire Resistance Related To The Reinforced Concrete Continuous T-beam Under Different Constraints

The occurrence of a fire will cause the building to be damaged to varying degrees,and the resulting direct and indirect economic losses and casualties are increasing year by year.Although fire resistance of the reinforced concrete structure is good.While,the mechanical properties of the concrete are changed after the fire,and the bearing capacity of the structure is seriously decreased.So it is necessary to study its high temperature performance in order to clearly understand the impact of high temperature on the structure.At present,there are few studies on the fire performance of reinforced concrete continuous T-beams,and high temperature test is hard to conduct for many reasons,including the high demand experimental equipment,long time consuming,huge cost,and strict standards for the experimental operation.so the ABAQUS is used to study the temperature field,fire resistance and mechanical performance of reinforced concrete continuous T-beam under fire.The main contents of the study include the following three points:Firstly,the ABAQUS was used to analyze the temperature field changes basing on the high temperature thermal performance,and thermodynamics performance of steel and concrete material.And the distribution of reinforced concrete was interpreted to result from the temperature change,fire scenery,time of fire,and depth of the cross section.Secondly,Based on temperature field analysis of reinforced concrete beam,considering different temperature curve,axial restraint stiffness ratio and rotational restraint stiffness ratio,load ratio,concrete cover of the beam and slab,longitudinalreinforcement ratio of the slab and beam,span-height ratio,slab width and thickness,the deformation and fire resistance of the continuous T-beam is studied by using thermo-mechanical coupling.Based on a large number of computational data collection and analysis,taking into account the impact of multiple factors,a perfect formula was proposed.Thirdly,the stress conditions of the continuous T-beam were discussed on various temperature curves,or other constraint conditions.And the different contribution of steel and concrete were analyzed under the different conditions of transient test,or stead state test.