• The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Effect of GFRP compression reinforcement on long-term deflections

Author(s): Stephanie L. Walkup, Eric S. Musselman, and Shawn P. Gross

Publication: Symposium Paper

Volume: 327


Appears on pages(s): 6.1-6.20

Keywords: compression reinforcement; long-term deflection; FRP reinforced beams; beam deflection; deflection multiplier; GFRP reinforced beams

DOI: 10.14359/51713326

Date: 11/1/2018

The effect of compression reinforcement to reduce long term deflections in GFRP-reinforced concrete beams was evaluated. Nine GFRP-reinforced specimens and three companion steel-reinforced specimens were tested under sustained load for a period of 100 days. Long-term deflection data was used to evaluate the reduction in long-term multiplier for GFRP-reinforced beams and the effects of the compression reinforcement to further reduce the multiplier. Compression reinforcement reduced the long-term multiplier for the GFRP- and steel-reinforced specimens. A new equation is proposed to incorporate the compression reinforcement index, kr, in the long-term deflection multiplier for any type of reinforcement. The experimental results also demonstrate that the ratio of the long-term deflection of a GFRP-reinforced vs. steel-reinforced beam can be determined in a relatively short period of time. Experimental results from the present study show that this ratio is 0.87 for the GFRP-reinforced specimens without compression reinforcement, in lieu of the present 0.6 value used in ACI 440.1R. Keywords: