Experiment Studies On The Shear Performance Of Concrete Beam With CFRP Bars

Fiber reinforced composites(FRP)bars reinforced coral aggregate concrete has become a research hotspot in the field of infrastructure construction of the island,and the current research of FRP reinforced concrete structure are mainly concentrated in the mechanical properties of FRP reinforced concrete flexural member on the study of shear member of less.The United States,Canada,Britain,Japan,China have established a design specification of FRP reinforced concrete,but the standard were not specified when the relevant content of the types of concrete for coral aggregate concrete specifications are applicable,not considering the shear span ratio of FRP reinforced concrete beam shear bearing capacity.In this paper,the research work of FRP reinforced concrete(ordinary)aggregate concrete beams is carried out:Firstly,through the shear tests of 2 CFRP reinforced coral aggregate reinforced concrete beams and 2 reinforced concrete beams CFRP,to explore and test the phenomenon of beam failure modes and summarized under different conditions;analysis of different stirrup ratio,longitudinal reinforcement ratio and the influence of different shear span ratio on girder cracking load and the ultimate bearing capacity and deflection.The result shows that the deflection of the beam increases with the shear span ratio increases with the elastic modulus of concrete to improve the increase of deflection rate,beam deflection under the same load level is higher,and the stirrup ratio has no effect on the beam deflection test;shear tests on the bearing capacity of the beam in a certain range,with increasing coordination stirrup ratio and concrete strength increases,and decreases with the increase of shear span ratio;longitudinal reinforcement ratio on the beam shear effect of bearing capacity is mainly related to the elastic modulus of longitudinal reinforcement.It is verified that the formula of shear capacity of FRP reinforced concrete beams in the current code of China,which has not been taken into account,is to be revised.Secondly,considering the influence of shear span ratio of FRP reinforced concrete beam shear capacity,puts forward the modified coefficient K,and by 33 FRP reinforced concrete beam shear test data analysis,derivation of fitting expressions of coefficient K,finally considering the shear span ratio formula into the test data to calculate,verify the calculation formula for the applicability of the FRP reinforced coral aggregate concrete beams,to provide reference for the design of concrete beams reinforced with FRP bars in the future for both the longitudinal reinforcement and stirrup,provide a reference for future engineering practice.