Title: Shear Strengthening of Reinforced Concrete Beams Using Externally Bonded Small-Diameter Carbon Strands

Author(s): Judy M. I. Soliman, Tarek K. Hassan, and Sami H. Rizkalla

Publication: Symposium Paper

Volume: 327

Issue:

Appears on pages(s): 48.1-48.12

Keywords: behavior, carbon strands (CS), debonding, delamination, externally bonded, fiber reinforced polymers (FRP), shear, strengthening

DOI: 10.14359/51713369

Date: 11/1/2018

Abstract:
The use of Fibre Reinforced Polymer (FRP) reinforcement has been widely adopted in the construction industry. This paper presents the findings of an experimental program undertaken to examine the use of small-diameter Carbon Fiber Reinforced Polymer (CFRP) strands for shear strengthening of concrete beams, not in a U-shape form confinement, but in a discrete form; sheets are applied to beam sides only. Nine concrete beams were constructed and tested to evaluate the effectiveness of the strengthening scheme. The considered parameters included the width and spacing of the CFRP strands strips. The research was extended to examine the feasibility of additional anchorage system, in form of longitudinal strips, to better resist the shear diagonal cracks in both components directions (vertical and horizontal), to delay premature failure due to delamination of the strands. Test results revealed that the use of small-diameter CFRP strands for shear strengthening of concrete beams is simple, easy to install and efficient in increasing the shear capacity by around 23% compared to the control specimen. It was also shown that presence of the longitudinal CFRP strands enhanced the shear behavior of the beams by providing more resistance to the induced diagonal tension and delayed delamination of the strands.