Evaluation of existing model for predicting of flexural behaviour of gfrp- reinforced concrete members

Abstract EN

Ashour formula [1] for predicting the flexural capacity of glass fiber-reinforced polymer (GFRP) bars reinforced concrete beams is introduced.

An implementation of the Ashour model is presented for the purpose of verification and evaluation against the experimental results which were collected from the literature.

This paper reported test results of seventy one concrete beams reinforced with GFRP bars subjected to a four point loading system.

All beams were governed by two modes of flexural failure ; GFRP bars rupture and concrete crushing.

The present study introduces an important modification in Ashour formula to compute the flexural capacity of GFRP bars reinforced concrete beams with high accuracy.

The comparisons between the theoretical flexural capacities which were computed by the modified equation and that experimentally measured show a very good agreement.

The new proposed equation is not limited to GFRP bars only, but can be used for other FRP bars such as carbon fiber-reinforced polymer and aramid fiber-reinforced polymer.

Influences of GFRP reinforcement ratio and the failure type on the beam deformability are also presented.