Analysis Of Axial Compression Performance Of FRP Confined Spiral Stirrup Concrete Columns

Fiber reinforced plastics is the English name of fiber-reinforced composite materials(FRP for short).Due to its strong corrosion resistance,light weight,high strength and other advantages,it has been widely concerned and applied in the last ten years.Based on the existing research,this paper designs the component columns of FRP materials,spiral stirrups and concrete materials.In this paper,the mechanical properties of FRP confined spiral stirrup concrete columns under axial compression are studied and analyzed by ABAQUS finite element simulation method.The finite element software ABAQUS is used to establish the model,set the parameters and analyze the operation of the component columns.The data in the simulation results are processed and the load displacement curve is drawn.The validity of the model is verified by the simulation of experiment finite element with reference.72 specimens were designed,and the influences of pipe thickness,slenderness ratio,stirrup spacing and concrete strength on mechanical properties were considered.The results show that the change range of ultimate bearing capacity of axially compressed columns is small under the change of FRP thickness,and the change of bearing capacity is relatively small under the condition of thickness difference of 0.436 mm.In engineering,1.38 mm FRP pipe can be selected,that is,the bearing capacity of FRP fiber pipe can be filled and distributed,and the pipe can be saved.The bearing capacity of axially compressed columns changes with the spacing of spiral stirrups.With the maximum spacing of stirrups,the bearing capacity of component columns decreases gradually.At the same time,the space of spiral stirrup can be increased properly.With the increase of concrete strength,the ultimate bearing capacity of columns increases,but FRP plays a relatively small role.The larger the concrete strength is,the smaller the increase of the column bearing capacity is.With the increase of slenderness ratio,the stability of columns decreases,and with the increase of slenderness ratio,the bearing capacity of columns decreases and the amplitude decreases.In order to make the research and analysis of the component columns more thorough,this paper also summarizes and analyzes the bearing capacity calculation formula of similar components,and draws some conclusions and engineering design opinions.