Fire Resistance of High-strength Reinforced Concrete Bars
Tensile tests of rebars for high-strength concrete buildings were carried out to obtain their mechanical properties during/after fire.
As for high-temperature tests, the test samples of USD685 rebars were subjected to temperatures of 20 to 1000 ℃. The stress-strain relationships can be well represented with Ramberg-Osgood type nonlinear curves.
Post-fire tests were performed on SD490 and USD685 samples. Heating conditions were based on cross-sectional finite difference analyses of a typical RC column, to be exposed to 30- to 180-minute long ISO834 fires. Post-fire mechanical characteristics of the rebars located in the column were virtually identical to those obtained prior to heating.
||Fire resistance, High-strength concrete, RC rebar