Title: Effective Moment of Inertia for Glass Fiber-Reinforced Polymer-Reinforced Concrete Beams

Author(s): Joseph Robert Yost, Shawn P. Gross, and David W. Dinehart

Publication: Structural Journal

Volume: 100

Issue: 6

Appears on pages(s): 732-739

Keywords: deflection; glass fiber-reinforced polymer; stiffness.

DOI: 10.14359/12839

Date: 11/1/2003

Abstract:
Deflection behavior of concrete flexural members reinforced with glass fiber-reinforced polymer (GFRP) reinforcing bars is investigated. It is recognized that serviceability plays a significant role in the design of GFRP-reinforced concrete beams. Therefore, accurate modeling of flexural stiffness is critical and the effect of influencing parameters must be considered. This study accounts for variations in concrete strength fc¢, reinforcement density r , and shear span-depth ratio (av / d). Experimental results from 48 simply supported concrete beams reinforced with GFRP are compared with ACI Committee 440’s published deflection model. The ACI 440.1R model is found to overestimate the effective moment of inertia, and an appropriate modification is presented.