Study On Axial Compression Performance Of FRP-reinforced FRP Reinforced Seawater Seasade Concrete Column

FRP(Fiber Reinforced Composite)bars have attracted wide attention in the past decades because they can effectively overcome the corrosion of steel bars.In recent years,some scholars have done research work on the axial compressive behavior of FRP-confined concrete columns.Considering the shortage of river sand supply in China,this paper proposes to replace river sand with sea water,and FRP bars with freshwater.The study on the axial compressive behavior of confined FRP reinforced concrete columns with seawater sand can promote the development and utilization of marine resources.In this paper,the compressive properties of GFRP bars are tested and the failure mechanism under compression is analyzed.The test results show that the stress-strain curve of GFRP tendons changes linearly during compression,and the specimen is brittle failure.In this paper,CFRP(carbon fiber reinforced composites)restrained GFRP(glass fiber reinforced composites)reinforced seawater sand concrete column is used.By controlling the same number of layers,different reinforcement ratios,different layers of seawater sand concrete and other different parameters,16 specimens are tested for axial compression performance.The specific contents of the study are as follows:The stress-strain curves of members are obtained by using the same number of layers,different reinforcement ratios,the same reinforcement ratios of different layers,and the stress-strain curves of ordinary concrete and seawater sand concrete.The test results show that with the increase of the number of wrapping layers,the ultimate load-bearing capacity of columns and the ductility of specimens increase considerably at the same reinforcement ratio and different wrapping layers.The strength of ordinary concrete is obviously higher than that of seawater sand concrete.In this test,Teng et al.’s 2009 design model and Jiang and Teng 2007 analysis model will be used to predict the test results,and then the predicted results will be compared with the test curve,showing that the mechanical properties of specimens wrapped with FRP are better than those without FRP.