B/CFRP筋海水海砂活性粉末混凝土梁抗弯性能研究

Study on Flexural Behavior of Seawater Sea-sand Reactive Powder Concrete Beams Reinforced with B/CFRP Bars

为研究B/CFRP-SSRPC结构的抗弯性能,以配筋率及梁截面高度为研究因素,对5根B/CFRP-SSRPC梁开展四点弯曲试验研究,探究研究因素对B/CFRP-SSRPC梁极限承载力、跨中挠度及破坏模式等的影响规律.试验结果表明:增大配筋率仅对试验梁开裂后抗弯性能有明显提升,增大梁截面高度对试验梁开裂前及开裂后抗弯性能均有提升,且对试验梁开裂前抗弯性能的提升更明显;所有试验梁均为脆性破坏,破坏模式与配筋率密切相关;现行中国、美国两国FRP筋普通混凝土结构设计规范均低估了B/CFRP-SSRPC梁的抗弯承载力及抗剪承载力,计算误差分别受试验梁的破坏模式及剪跨比影响.

To study the flexural performance of B/CFRP-SSRPC structures,four-point bending tests were conducted on 5 B/CFRP-SSRPC beams taking reinforcement ratio and beam section height as research factors,the influence law of research factors on the ultimate bearing capacity,mid-span deflection,and failure mode of B/CFRP-SSRPC beams was explored.The test results show that increasing the reinforcement ratio only improved the flexural performance of test beams after cracking,while increasing the beam section height improved beam flexural performance before and after cracking,and the improvement of beam flexural performance before cracking was more obvious;all test beams exhibited brittle failure,and the failure mode was closely related to the reinforcement ratio;the current design codes for FRP reinforced concrete structures in both China and the United States underestimated the flexural and shear capacity of B/CFRP-SSRPC beams,and the calculation error was affected by the failure mode and shear span ratio of the test beams,respertively.