BENDING BEHAVIOR OF TRC THIN-PLATES WITH SHORT STEEL FIBERS AT ROOM TEMPERATURE AND AFTER HIGH TEMPERATURE

This paper focuses on the textile reinforced concrete(TRC) thin-plates with the addition of short steel fibers. The influence of the length-diamond ratio and the volume content of short steel fiber on the bearing capacity of TRC thin-plates are investigated by means of four-point bending tests. ISO-834 International Standard Fire Curve is controlled by programmed temperature furnace, and the heating time is 0.5h or 1.0h respectively. The experimental results show that the addition of short steel fibers can improve the bending capacity and stiffness after the cracking of the TRC thin-plates. Length-diamond ratio of short steel fibers has little influence on the bearing capacity and deformability of the TRC thin-plates. The bending capacity of specimens with 1.0% steel fiber addition has increased by 61%. With longer heating temperature time, the bearing capacity of the TRC thin-plates decreases gradually, and the number of continuous crack reduces greatly. All the specimens almost lost the damage characteristics of multiple cracking after heated by 1.0h. Whether exposed to room temperature or high temperature, the TRC thin-plates with 1.0% steel fibers addition shows a certain residual mechanical property.