Title: Effect of Transverse Reinforcement on Shear Response of Fiber-Reinforced Polymer Post-Tensioned Concrete Beams

Author(s): Fei Peng and Weichen Xue

Publication: Structural Journal

Volume: 119

Issue: 5

Appears on pages(s): 31-42

Keywords:

DOI: 10.14359/51734897

Date: 9/1/2022

Abstract:
To investigate the shear behavior of post-tensioned concrete beams with fiber-reinforced polymer (FRP) reinforcements, a total of seven large-scale post-tensioned beams, with a total length of 5000 mm and a shear span-depth ratio of approximately 3.0, were tested to failure. Each beam was longitudinally reinforced with carbon FRP (CFRP) tendons and non-prestressed glass FRP (GFRP) bars. One reference beam had no stirrups and six beams were reinforced with GFRP stirrups. The test variables included the type (closed tie and continuous rectangular spiral) and ratio of GFRP stirrups. The diagonal crack width was obtained using digital image correlation. It was found that the beams with the highest shear GFRP reinforcement ratio of 0.47% failed in flexure, while the rest of the beams failed due to shear compression. The presence of GFRP stirrups had a slight effect on the flexure-shear cracking force, while it can efficiently restrict the development of shear cracks. The beams with GFRP tie ratios of 0.24% and 0.32% exhibited 6.6% and 13% increased shear capacity with respect to the beams without stirrups, respectively. The use of rectangular spiral GFRP shear reinforcement was highly favorable for enhancing the shear capacity.