Experimental investigation on the use of glass fiber reinforced polymer reinforcement in hollow-core circular concrete columns
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 achieved higher ductility than the GFRP-HC specimens under 50 mm eccentric axial loading and four-point bending. However, under concentric and 25 mm eccentric axial loading, the GFRP-HC specimens achieved higher ductility than the steel-HC specimens. The close pitch of the GFRP helices significantly enhanced the load carrying capacity and ductility of the GFRP-HC specimens.
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Higher Education Commission, Pakistan