Numerical Simulation Of The Whole Process Of The Fire Resistance Of Reinforced Concrete Frame Structure

Reinforced concrete frame structure is the most widely used in housing construction, and the number of fires of this type of construction per year is more.One important reason for this threat is the the building damaged or even collapsed under high temperature.At home and abroad have carried out a number of pilot studies to ensure that the structure has a fire resistance ability, and achieved certain results and standards of fire safety design. But the traditional fire design specifications can not cover all cases in the actual. Adoption of international standards the heating curve instead of the actual temperature curves can result in error. Previous studies only for the internal environment temperature under fire, or analysis component temperature and deformation using the international standard temperature curve directly, lack of the overall consideration of the whole process of the fire. In this paper, using the fire simulation software FDS and finite element analysis software ANSYS, analysis the internal temperature changes, structural elements and nodes temperature distribution, the structure deformation and stress, the fire resistance of the structure. Mainly done the following work:1. Carry out an investigation of fire load and fire simulation of a frame structure. Using performance-based fire design method, survey of the FDS fire simulation process, input key parameters, such as spatial dimensions, combustibles layout and location of the source of fire. By setting temperature observation point, getting the environmental temperature distribution. Simulate a real fire warming curves and heat release rate curve for the data base of finite element analysis.2. Thermal performance and mechanical properties of the material in the process of considering warming fire simulation software FDS measured different locations at the heating curve temperature load applied to the finite element analysis software ANSYS, the temperature change of the structural members under firetransient thermal analysis, different moments beams, columns cross-section as well as node internal temperature field distribution, and to lay the foundation for the study of high temperature fire resistance of reinforced concrete frame structure.3. ANSYS simulation using finite element simulation software to existing experimental and simulation results with the experimental results were compared to prove the feasibility of the simulation of this article. Next coupled thermo analysis of reinforced concrete frame structure model drawn fire under the framework of the horizontal and vertical direction displacement contours Von Mises stress contours. Using of the existing specifications to determine the time of fire resistance of the structure.Ultimately due to the the beam vertical deformation loss of carrying capacity, excessive leaving the structure collapsed.The work done in this article provide some reference for future in-depth study of fire resistant design of reinforced concrete frame structure, structural fire resistance, as well as plans for emergency fire.