Degree Name

Doctor of Philosophy


School of Civil, Mining and Environmental Engineering


Hollow-core concrete columns are preferred over solid concrete columns to reduce the cost and self-weight of reinforced concrete structures. Steel reinforcement in hollow-core concrete columns is susceptible to corrosion, particularly in harsh or moist environments. To overcome the corrosion problem of steel reinforcement, fiber-reinforced polymer (FRP) bars and FRP helices are considered the most suitable alternatives to ordinary steel bars and steel helices, respectively. Glass-FRP (GFRP) bars are preferred over the other types of FRP bars due to the low cost and advantageous characteristics of GFRP bars compared to other FRP bars. This study investigated the behavior of short hollow-core concrete columns reinforced with GFRP bars and helices under different loading conditions (concentric axial loading, eccentric axial loading and four-point bending). The effects of the addition of corrosion-resistance glass fibers and polypropylene fibers in the concrete on the behavior of GFRP bar-reinforced hollow-core concrete columns were also investigated. In addition, the effect of different pitches of the GFRP helices on the behavior of GFRP bar-reinforced hollow-core concrete columns was investigated. Moreover, to predict the axial load-carrying capacity of GFRP bar-reinforced hollow-core concrete columns, simplified equations were proposed and validated against experimental results. Furthermore, the load-moment interaction diagrams of GFRP bar-reinforced hollow-core concrete columns were developed analytically. The developed load-moment interaction diagrams were validated with experimental load-moment interaction diagrams.

FoR codes (2020)

400510 Structural engineering



Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.