Experiment on Flexural Behavior of Bridge Structure Reinforced with a Novel FRP Material Based on Scale Model

摘要

Taken a reinforced concrete beam bridge which has 20 m main span as an example, based on similarity theory, 9 scale model beams of T-beam were designed in accordance with C_L=1/4. The test was divided into three groups: test I: contrast beams without reinforcement, test II: reinforced beams without considering the secondary load, and test III: reinforced beams considering the secondary load. The ultimate load, crack propagation, strain of basalt fiber reinforced polymer (a novel FRP material) sheet and the ultimate failure mode of the beams reinforced by BFRP sheet in the cases of test II and test III discussed. By comparing the results of three tests, it shows that (1) the average deflections of test II and test III decreased by 36.7% and 28.9% respectively than that of test I; (2) the final average strains of BFRP sheet in test II and test III are 15118με and 10921με which are 84.4% and 61.0% of the ultimate tensile strain of BFRP sheet respectively, indicating the stiffness of beams is increased after reinforced by BFRP sheet and the reinforcement effect of test II is better than that of test III; (3) all the ultimate failure mode of reinforced beams are brittle failure.