Experimental Research And Numerical Simulation On Fire Resistance Performance Of R.C. Beams After Stress Damage

The researchers and the engineers have consistently focused their attention on themechanical property at elevated temperature and fire safety design of the reinforcedconcrete structure，which is one of the most commonly use in construction.Besides the extensive damage brought by the fire，the effete on the buildings isalso extraordinary severe. After fire，the carrying capacity，deformation，durability andanti-seismic performances of the members are damaged in different degree，whichdecreases durability and building safety. Both experimental study and finite elementanalysis are used in this paper，the law of temperature field about section after firewere selected as the main research object. The concrete contents are as follows:1. The thermal parameter and mechanical property of concrete and steel bar atelevated temperature were compared in different documentation of domestic andforeign countries. And then properly parameters were selected to analysis thetemperature filed and the bearing capacity of reinforced concrete beam.2. The experiments of seven reinforced concrete beams under fire areaccomplished. The deformation characteristic and damage form of members areinvestigated through the tests. The influences for its fire-resistance behaviors ofdamages exposed to fire are researched and discussed.3. The distribution of the temperature field of beams is presented with ANSYS.The map of temperature filed distribution diagram for each time and different sectionaldimension was drew.