On Fire Response Analysis And Fire Resistance Design Of HPC Frame

The fire resistance of high-performance concrete frame structures, which included calculations and analysis of temperature field, deformation, and post-fire ultimate loadings, was investigated in this paper with ANSYS. Finally, the fire-resistance design of concrete structures was also discussed.(1) The boundary condition, the type of aggregate, and the thermal parameters in the temperature field of the high-performance concrete structures were studied, at the same time, values of boundary condition and thermal parameters were studied. Based on the analysis, it was found that the effect of boundary condition and the type of aggregate on the temperature field was significant. The temperature field of frame joints was different from that of the beam cross-section, which should be considered in calculations. Radiation was mainly affected by temperature, and usually had to be considered beyond 400℃.(2) The deformation of the frame under fire was investigated and it was found that the material performance under high temperature was deteriorated, which would increase the deformation. The bond-slip had remarkable influence on the results. The effect of local explosive spalling was decided by the position, and the spalling near the frame joint was to the worst.(3) The post-fire ultimate load capacity of HPC frame was also calculated using the finite element program ANSYS. The result of equivalent section method was less than the results from the finite element program, which demonstrates the former was a conservative approach.(4) After the discussion of fire-resistant design method of the HPC frame, with deterministic method and stochastic method respectively, some advices were put forward for future research.