| In recent decades,Fiber Reinforced Polymer(FRP)is utilized widely in civil engineering.FRP is one of the most effective material to solve the problem of corrosion of steel for its excellent corrosion resistance property.As a new type of structure,FRP-concrete composite structures maximize the respective advantages of the two materials and has properties,such as good corrosion resistance and high bearing capacity.The connection or composite action between FRP and concrete is the key factor affecting the performance of composite structure.The research work mainly includes the following parts:(1)Stress distribution of an infinite orthotropic plate with a partially loaded hole is obtained with the method of complex function,which will provide basic theoretical preparation for analysis of perforated FRP plates.(2)In order to analyze the connection effect of hole size of perforated FRP plates on FRP-concrete structures,pull-out tests of 17 specimens in six groups are conducted to investigate the influence of hole size of perforated FRP plates on ultimate load-carrying capacity,failure modes and load-displacement relationship of FRP-concrete connection.The results show that the perforated FRP plates can effectively increase the connection between FRP and concrete.With the increase of hole diameter of perforated FRP plates,the ultimate load increases first and then deceases,and the failure mode transfers from shear failure of concrete inside the hole to rupture of FRP along the hole side.(3)A formula of ultimate loads accounting for the influence of stress concentration of perforated FRP plates is proposed.When compared with the test results,the proposed formula can effectively predict failure mode and ultimate load of perforated FRP plates in concrete.In summary,the present study evaluates experimentally and analytically the connection or composite action effect of FRP and concrete structures and sheds light on design analysis of hole size of perforated FRP plates on FRP-concrete structures. |
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