Testing and Strut-and-Tie Modelling of Beams with GFRP Reinforcements

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Title: Testing and Strut-and-Tie Modelling of Beams with GFRP Reinforcements

Author(s): Martin Krall and Maria Anna Polak

Publication: Special Publication

Volume: 322

Issue:

Appears on pages(s): 11.1-11.12

Keywords: Deep Beam; FRP; GFRP; Indeterminate Strut-and-Tie; IST Method; Shear; Shear-Compression; Stirrups; Strut-and-Tie

Date: 6/18/2018

Abstract:
This paper presents the results of tests done on concrete beams reinforced with glass fibre reinforced polymer (GFRP) longitudinal bars and GFRP stirrups. The main test variables were the size, the amount, and the arrangement of longitudinal reinforcement as well as the size and spacing of closed loop stirrups. Six beams are divided into two series defined by stirrup spacing, or three pairs defined by longitudinal bar arrangement. The results indicate that the specimens with no stirrups failed in shear-tension while the beams with stirrups failed in shear-compression showing deep beam behaviour. The results were compared to predictions from several methods, namely a novel Indeterminate Strut-and-Tie (IST) method formulated specifically for use with brittle reinforcements, as well as the shear models of the ACI 440.1R-06 guidelines, the CSA S806-12 standard, and the Nehdi et al. (2007) method. The IST method produced the best predictions followed by the method of Nehdi et al. as both are formulated for use with deep beams.