Date of Award

Fall 2001

Document Type

Thesis

Degree Name

Master of Science in Civil Engineering - (M.S.)

Department

Civil and Environmental Engineering

First Advisor

C.T. Thomas Hsu

Second Advisor

Edward G. Dauenheimer

Third Advisor

Walter Konon

Abstract

Considerable research has been performed using CFRP plates bonded to normal reinforced concrete beams, the objective being to improve shear and flexural strength. However, very few tests have been performed on reinforced concrete deep beams with CFRP as shear reinforcement. The purpose of this experiment is to investigate the behavior of the deep beam in shear with various arrangements of Sika CarboDur laminates bonded to the sides. The beams were designed to be shear deficient with stirrups omitted, except at the supports and directly under the load. In total eight beams were tested, four with one-point loading and four with two-point loading. Each loading condition contained one control beam without CFRP, and three beams with the CFRP laminates attached at zero, forty-five, and ninety degrees with respect to the neutral axis. The ultimate loading capacity and behavior for each beam bonded with the CFRP laminate was observed and recorded.

The mode of failure was shear in all the beams tested, which typically resulted from the delaminating between the concrete and the epoxy. The present test results show that the orientation of the CFRP about the neutral axis had a direct effect on the shear strength of the beam and its ductility. The forty-five degree alignment of CFRP plates gave the greatest increase in shear capacity and ductility, whereas the ninety-degree alignment gave the least amount.

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