Abstract
In order to investigate shear and bending behavior in fire of I-shaped prestressed precast concrete (PCaPC) beams with high-strength rebars and multiple large openings, three specimens for PCaPC beams were tested. The fire resistance time, temperature of cross section and deformation of PCaPC beams were confirmed from the test results. The evaluation method for bending and shear strength of PCaPC beams at high temperature, as well as the results of the fire experiment will be presented. In this analytical method of bending and shear strength, two modes of resistance mechanism of PCaPC beam are proposed. In one mode, RC beam is supposed to be the resistance mechanism, and in the other, structure of upper and lower beams. The fire resistance time calculated by this proposed method, taking into account the temprature and bond strength of longitudinal and shear rebar and concrete, is shorter than experimental results by 14 to 45 minutes.
