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This paper presents the results of an experimental investigation on the behavior of glass fiber reinforced polymer (GFRP) bar-reinforced hollow-core (GFRP-HC) circular concrete specimens under concentric, 25 mm and 50 mm eccentric axial loading and four-point bending. The main parameters investigated include the type of reinforcing bars, pitch of the helices and loading conditions. The test matrix of this study consists of 12 specimens, among which nine specimens (850 mm high) were tested under concentric and eccentric axial loading and the remaining three specimens (1500 mm long) were tested under four-point bending. The specimens were circular in cross-section with an outer diameter of 214 mm and an inner circular hole diameter of 56 mm. The experimental results showed that, for the similar amount of reinforcement, steel bar-reinforced hollow-core (steel-HC) specimens sustained higher loads than the GFRP-HC specimens under different loading conditions. Also, the steel-HC specimens ac ....

Concentric Axial Load , Ccentric Axial Load , Lass Fiber Reinforced Polymer Bar , Lass Fiber Reinforced Polymer Helix , Ollow Core Columns , Reinforced Concrete ,