Axial Compression Performance and Theoretical Study of Full-size HFRC Columns Reinforced With GFRP Bars and Spirals

In order to study the axial compression behaviors of HFRC (hybrid fiber reinforced concrete)columns reinforced with GFRP(glass fiber reinforced polymer)bars and spirals,five HFRC columns reinforced with GFRP bars and spirals and one HFRC column were tested. The influence effects of the stirrup spacing and longitudinal reinforcement ratio were analyzed. The results indicate that the increase of longitudinal reinforcement ratio can enhance the bearing capacity and the ductility of small stirrup spacing specimens was significantly higher than that of large stirrup spacing specimens. According to the experimental data, the calculation formula of the peak stress, peak strain and the bearing capacity of GFRP reinforced HFRC columns are returned.