Physical Properties of Glass Fiber Reinforced Polymer Rebars in Compression
Publication: Journal of Composites for Construction
Volume 7, Issue 4
Abstract
Forty-five glass fiber reinforced polymer (GFRP) rebars were tested in compression to determine their ultimate strength and Young’s modulus. The rebars (or C-bars), produced by Marshall Industries Composites, Inc., had an outside diameter of 15 mm (#15 rebar), and unbraced lengths varying from 50 to 380 mm. A compression test method was developed to conduct the experiments. Three failure modes, that are directly related to the unbraced length of the rebar, are identified as crushing, buckling, and combined buckling and crushing. The crushing region represents the failure mode a GFRP rebar would experience when confined in concrete under compression. The experimental results showed that the ultimate compressive strength of the #15 GFRP rebar failing by crushing is approximately 50% of the ultimate tensile strength. Based on a very limited number of tests, in which strain readings were acceptable, Young’s modulus in compression was found to be approximately the same as in tension.
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References
Deitz, D. H., Harik, I. E., and Gesund, H. (1999). “GFRP reinforced decks.” Kentucky, Transportation Center Research Report No. KTC-00-1, Univ. of Kentucky, Lexington, Ky.
Kobayashi, K., and Fujisaki, T. (1995). “Compressive behavior of FRP reinforcement in non-prestressed concrete members.” Non-metallic (FRP) reinforcement for concrete structures, E&FN Spon, London.
ASTM. (1996). “Standard test method for compressive properties of rigid plastics.” ASTM D695-96, West Conshohocken, Pa.
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Copyright © 2003 American Society of Civil Engineers.
History
Received: Jun 22, 2001
Accepted: Jun 25, 2002
Published online: Oct 15, 2003
Published in print: Nov 2003
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