Design Strategies Study On The Influence From Interfacial Force Of FRP Tendons

In recent years, in order to solve a series of problems which caused by the steel corrosionin reinforced concrete structure,fiber reinforced plastic rebar (FRP) is used for the reinforcedconcrete structure instead of the common steel. Compared with the common steel,FRP hasthe advantages of high strength, light weight, corrosion resistance and non-magnetic, so it iswidely used in the civil engineering field nowadays. Therefore, it is very meaningful toresearch the mechanical behavior of FRP. In this paper, the means of simulation analysis havebeen utilized to establish the finite element analysis models of concrete beam with prestressedAFRP,which includes the bonded,non-bonded, mixed and part of bonded reinforcement. Whatis more, the flexural behavior of the concrete beams with AFRP reinforcement is deeplyresearched in the paper. The main work of this paper can be summarized as follows:First,the type,the composition,the mechanical properties and the production technologyof FRP, as well as the research status of all kinds of prestressed FRP are introduced in thispaper.Second, some-sconstitutive relation models of FRP reinforcement which areestablished by the domestic and foreign scholars is studied,and the constitutive relation modelof this article is given.At the same time, the working principle of FRP tendons and concretebonding is analyzed,the factors and the premise condition which influence the bond strengthof FRP reinforcement is lists.Third,through the finite element models of concrete beam with prestressed AFRP, theload-deflection value, cracking, stress value of AFRP reinforcement,the characteristic loadand the displacement ductility of the beam are analyzed.According to the response of thebeam to load, the interface between the prestressed FRP tendons and the concrete whichinfluence the bending performances of the concrete beam with prestressed FRP is got.Finally, The calculation formula of normal section flexural capacity of the prestressedFRP reinforced concrete beam with the bonded and part of bonded reinforcement is putforward.flexural bearing capacity of normal section,and the calculation formula is used tocalculate the normal section flexural capacity of the prestressed FRP reinforced concretebeam with the bonded and part of bonded reinforcement.At last through the comparison of the calculated value and the experimental value,the applicability of the calculation formula isvalidated.