International Concrete Abstracts Portal

Title: Shear Strengthening Effects with Varying Types of FRP Materials and Strengthening Methods

Author(s): J. Sim, G. Kim, C. Park, and M. Ju

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 1665-1680

Keywords: CFRP; CFS; GFS; shear; strengthening

Date: 10/1/2005

Abstract:
The FRP system is a good alternative of the traditional shear strengtheningtechnique. This study evaluates the shear strengthening effects on the reinforcedconcrete beams strengthened with varying types of FRP materials, CFRP, CFS and GFRP.The entire strengthened specimens were failed in the mode of brittle shear failure withdebonding of the FRP materials. The shear capacities were improved mostly by morethan 54%. The different types of the strengthening materials did not yield a noticeabledifference in the shear strengthening effect. The orientation of the fibers, however,was found to be an important factor. With a 45° fiber orientation, greater strengtheningeffect and better control on the shear crack propagation were observed. A numericalmodel predicting the shear capacity of the shear-strengthened beams was suggestedalong with the strength efficiency factor from the test results. The predictions were ingood agreement with the test results.