Numerical Analysis Of Fire Resistance Behavior Of Reinforced Concrete Frame Structure

In this thesis, reinforced concrete frames at elevated temperature was analyzed with ANSYS, which included calculations of temperature field, deformation, stress, internal force redistribution, post-fire ultimate loading. This calculations were compared with experimental result. Finally the fire-resistance design of reinforced concrete structures was also discussed. It contained:(1) Temperature field was simulated with finite element software to get the temperature distributing and the variety with time of the structure, which were also compared with experimental result. Then several reinforced concrete beams whose section size were close to construction were calculated with finite element software to provide the basis of determining the temperature field for the fire-resistance design.(2) In the discussing of fire-resistance behavior, we analyzed the characteristic of deformation and the variety of stress of structures still with method of numerical analysis; The internal force redistribution of structure at elevated temperature was expressly analyzed with method of solid element post-processing. Reference with method of the plastic limit moment method at ambient temperature and the equivalent reduction model of cross-section the ultimate loading of the indeterminate structure was calculated and compared with simulation result of finite element.(3) Finally, the current fire design methods were reviewed, and under the research of this paper some suggestions were put forward.