Experimental study on size effect of shear capacity of BFRP-reinforced concrete short beams
The size effect of the shear capacity of concrete short beams can be effectively weaken by the reasonable arrangement of shear web reinforcement.Shear tests were conducted on eight BFRP-reinforced concrete short beams with cross-sectional heights of 300 mm to 1 200 mm(including four short beams without web reinforcement and four short beams with horizontal and vertical web reinforcement ratios of 0.5％).The development trends of the failure mode,load-deflection curve,and web reinforcement strain with changes in beam section height were analyzed,and the size effect of shear capacity of BFRP-reinforced concrete short beams without and with web reinforcement was revealed.It is shown by tests that when the cross-sectional height increases from 300 mm to 1 200 mm,the nominal shear strength of test beams without web reinforcement decreases by 52.3％,while the nominal shear strength of test beams with a web reinforcement ratio of 0.5％still decreases by 45.7％.The results indicate that BFRP-web reinforcement has not significantly suppressed the size effect behavior.Compared with the calculation results of relevant design codes in other countries,the shear capacity design method proposed by the author in previous research can reasonably reflect the size effect of BFRP-reinforced concrete short beams.The calculation results are in good agreement with the experimental results.
concrete short beambeam with web reinforcementBFRP barshear capacitysize effect
万方数据
维普
