Abstract
In order to investigate shear and bending behavior of prestressed precast concrete (PCaPC) beams with high-strength rebars and multiple large openings, three specimens for PCaPC beams were tested. Test parameters are the level of vertical loading and the quantity of shear reinforcement. It was confirmed from the test results that PCaPC beams are able to resist the allowable permanent during 3 hours standard fire. 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 shear strength, the truss mechanism across openings in addition to at opening and between openings was considered. This new shear strength mechanism is proposed to calculate with a good accuracy taking into account of the temperature of longitudinal and shear rebars.
