Finite Element Analysis Of Seismic Behavior Of Full GFRP Reinforced Concrete Columns

The full GFPR(Glass Fiber Reinforced Plastic)confined concrete column,replacing the longitudinal bars and stirrups with GFPR in traditional reinforced concrete column,is a another trial after combining FRR(Fiber-Reinforced Polymer)and steel bars in concrete columns.The structure of GFPR is lighter but with higher strength.Meanwhile,this structure has advantage on anti-corrosion.Recently,it has been realized that the damage caused by earthquake is another critical issue.Mitigating the seismic vulnerability and enhancing safety of structures paly a more and more vital role.Nevertheless,the GFPR is a brittle material.Current research is not able to sufficiently demonstrate the process of damaging and performance of stress under earthquake.Thus,it is essential to develop a new damage model to provide more details for GFPR structures.By comparing with existed experiment data,this paper presents a new strategy to simulate the anti-earthquake performance of GFPR columns through ABAQUS software,aiming at proving the effectiveness of finite element simulation analysis.The model would use spring2 unit to simulate the bond-slip relationships between GFPR and concrete and compare the results without taking bond-slip into accountant.In conclusion,if the bond-slip relationship is ignored,the carrying capacity and ductility would be overestimated.At the same time,it is feasible that spring 2 unit could simulate bond-slip relationship.This paper introduces three parameters,volume ratio,longitudinal reinforcement ratio and slenderness ratios to compare different results under various axial pressure ratio for cyclic load on GFPR columns.The conclusions listed below demonstrate the how axial pressure ratio,stirrup,longitudinal bar and slenderness ratios would affect the anti-earthquake behavior of GFPR columns.(1)With increasing axial pressure ratio,the carrying capacity of columns is improved.While the comprehensive performance index and energy-dissipating capacity are decreased.When achieving its limit capacity,the columns undertake more damage.(2)With increasing volume-stirrup ratio,the carrying capacity and deformability of columns are improved significantly.Meanwhile,the comprehensive performance index is increased.When achieving its limit capacity,the columns undertake less damage.(3)With increasing ratio of longitudinal reinforcement,the carrying capacity andcomprehensive performance index of columns are improved significantly.Column stiffness increased,the degradation of stiffness decreases.When achieving its limit capacity,the columns undertake more damage.(4)With increasing ratio of slenderness ratios,the carrying capacity of the column is greatly reduced,the comprehensive performance index is significantly improved,the stiffness is significantly reduced,and the energy-dissipating capacity of the column is significantly reduced.