Experimental Study On Mechanical Properties Of FRP Cloth In Seawater And Numerical Simulation Of PVC-FRP Confined Concrete Column

FRP(fiber reinforced polymer)-PVC(polyvinyl chloride)tube confined concrete is a new type of FRP confined concrete structure,which is characterized by light weight,high strength and high corrosion resistance.In recent years,many scholars have done a lot of research on the mechanical properties and seismic behavior of FRP-PVC tube confined concrete.However,the study on the corrosion resistance of concrete,which is one of the most important characteristics,is seldom made.Based on the Natural Science Foundation of Liaoning Province subject,the mechanical properties of FRP fabric cloth under seawater immersion condition were studied.At the same time,the numerical simulation of PVC-FRP confined concrete column was carried out with the experimental results.First of all,the seawater accelerated corrosion test with 360 specimens under different working conditions of CFRP and BFRP were carried out.Through the analysis of the experimental results,the influence of corrosion age,seawater temperature,the type of fiber cloth and layer numbers of strip on the tensile strength of the band was got.The results show that the corrosion resistance of CFRP is stronger than BFRP under the condition of high temperature and high concentration seawater;and the more layers fiber cloth has,the lower the tensile strength is.We found something through the corrosion resistance curve,which the more layers the fiber cloth had,the worse the corrosion resistance became.Secondly,according to the fitting of experimental data,it is required to establish FRP strip corrosion resistance model under high temperature and high concentration seawater condition,and validate the model.Finally,the finite element model of FRP-PVC tube confined concrete columns under different seawater corrosion conditions was established by ANSYS finite element analysis software combined with the FRP strip mechanical parameters,through analysis,got variation rule about the bearing capacity of axial compression on FRP-PVC tube confined concrete columns under the high temperature and high concentration seawater corrosion conditions.It can be found that temperature has great influence on the corrosion resistance of the composite structure.In the same corrosion age,the ultimate bearing capacity for the composite structure under high temperature is obviously lower than the normal temperature.FRP strips under high temperature and high concentration seawater corrosion conditions and the combination of structural and mechanical properties decline present a "first fast then slow" trend.