Axial Performance Of Long SSSC Columns Reinforced With BFRP Bars

Due to the complementation of poor tensile properties of steel bars and great compressive perfomance of concrete,reinforced concrete is the most widely used building material in the world.However,the construction of concrete structures can consume a huge amount of natural resources,such as river sand and freshwater.In addition,there is a lack of building materials in some remote and marine areas.Reinforcement is not suitable in marine environments with a high chloride ion concentration because of the weak corrosion resistance.Recently,fibre-reinforced polymer（FRP）material which has many advantages of high strength,light weight,corrosion resistance,and good fatigue resistance has been appeared in civil engineering.It has been widely used in sea-sand seawater concrete（SSSC）structures.Some formulas for calculating the axial bearing capacity of FRP reinforced concrete short columns without considering the stability coefficient are proposed.But the design formulas for the axial compressive capacity of FRP reinforced seawater sea-sand concrete column has not been given in any national codes.In order to obtain a reasonable and reliable formula for calculating the axial compressive capacity of FRP bars,the following work will be carried out in this project:（1）Eight BFRP reinforced seawater sea-sand concrete columns with different slenderness ratio,reinforcement ratio,stirrup ratio and concrete strength will be cast and axial compression experiment will be conducted.The axial load,the axial and lateral deformation,the strain of SSSC surface,the strain of BFRP longitudinal and transverse bars will be analyzed.The effect of variables on the axial bearing capacity of FRP bar SSSC column will be studied.（2）In this paper,a formula for calculating the axial compressive capacity of FRP bars is proposed,in which some factors such as the compressive modulus of FRP bars and slenderness of columns are considered.By comparing the bearing capacity calculated by the proposed formula with the bearing capacity calculated by the design formulae for axial compressive capacity of FRP reinforced concrete short column proposed by other scholars,it can be seen that the calculation formula proposed in this paper is more accurate.