Research On Bending Performance Of FRP-Concrete-Steel Double Skin Tubular Beams

Fiber Reinforced Polymer,referred to as FRP,because of having excellent corrosion resistance,abrasion resistance,outstanding durability,tensile strength,plasticity rich material properties advantages of small weight,since FRP invention since it has been close many domestic and foreign researchers,where the application of FRP in structural engineering to FRP-concrete-steel double skin composite structure is more typical.FRP-Concrete-Steel double skin tubular beams is a new type of composite structure formed by the steel pipe in FRP tube and the concrete pouring in two pipe tubes.FRP-Concrete-Steel double skin tubular beams,FRP material has good corrosion resistance and durability can better resist the erosion of structure by external harsh environment,the existence of FRP tube can not only restrain the internal concrete,make the mechanical properties of the structural components improve,but also can be used as a permanent template and protect the material in the tube,Saving the time and cost of construction work.FRP-concrete-steel double skin composite structure as a new type of composite components is expected to be more commonly used in the future.In this paper,according to the research status of FRP tube constrained concrete at home and abroad,according to the force principle of FRP concrete-steel pipe composite beam,the mechanical properties of FRP-Concrete-Steel double skin tubular beams are studied by theoretical analysis and the combination of ABAQUS finite element software simulation analysis,and the following steps are carried out:1)Through the ABAQUS finite element analysis software,the calculation model of FRP-Concrete-Steel double skin tubular beams is established,and the mechanical performance indexes such as load-deflection curve,limit load,limit deflection value and deformation condition obtained by finite element simulation analysis are compared and analyzed with the test results in the reference literature.The accuracy of the finite element model of FRP tube-concrete-steel pipe composite beam is verified.2)Through the numerical simulation of FRP-Concrete-Steel double skin tubular beams,the working principle of the composite structure is studied and analyzed,and the influence of different concrete strength grade,FRP pipe layer,steel pipe thickness and eccentric distance of steel pipe on the performance of the combined structural mechanics is studied and analyzed.The influence law of different influencing factors on structural mechanics performance was understood.3)By consulting the relevant literatures,the formula for calculating the flexural bearing capacity of FRP-Concrete-Steel double skin tubular beams is established,and the calculated results are compared with the numerical simulation results.It is found that the calculated results of the theoretical formula are in good agreement with the numerical simulation results.