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Bi-directional Application of Carbon Fiber Reinforced Polymer (CFRP) with CFRP Anchors for Shear-Strengthening and Design Recommendations / Quality Control Procedures for CFRP Anchors

Project Summary

The objective of the study is to demonstrate the feasibility of using bi-directional CFRP for shear strengthening of large bridge I and U-beams. This project is an outgrowth of project 0-6306 in which it was demonstrated that uni-directional CFRP strips and CFRP anchors could be used to improve the shear strength of reinforced concrete elements. The prime objective of that study was to evaluate the role of CFRP anchors. The tests showed that without anchors, the CFRP strips debonded and there was no significant improvement in the shear capacity. With CFRP anchors, it was possible to achieve a 40-50% increase in shear capacity. Tests of four 54in. deep I-beams with both uni-directional and bi-directional CFRP strips indicated that the use of bi-directional strips led to significantly greater increases in shear capacity. It would not have been possible to strengthen the I-beams without the use of anchors to prevent debonding of the CFRP at reentrant corners of the cross section. Because the data on the bi-directional layout of CFRP was limited, additional work is needed to understand the behavior of the CFRP in strengthening thin webs subjected to large shear forces.

Project Number

0-6783

Status

Completed

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Project Details

Start Date

9/1/2012

End Date

12/31/2015

Performing Institution(s)

Center for Transportation Research (CTR)

Research Team

RS: James Jirsa

Sponsor

Project Manager

Darrin Jensen

Contract Specialist

Annette Trevino

Amount Funded

FY16: $42,320

Publications from this Project

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Functional Area

Structures and Hydraulics

Index Terms

Anchors (Structural connectors)
Bridge design
Carbon fibers
Fiber reinforced polymers
I beams
Quality control
Shear strength
Strengthening (Maintenance)

Lead University

CTR

Researcher

Jirsa, J. O. (James Otis)

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Comments

kevyn

Researcher Wassim Ghannoum received the 2021 Wason Medal for Most Meritorious Paper at American Concrete Institute’s Spring 2021 Concrete Convention for a research paper related to this research. "TxDOT funded Ghannoum’s research to find a way to take CFRP repair to the next level. Instead of using sheets by themselves to cover cracks and fractures, Ghannoum developed a unique approach by taking the carbon fiber and cutting it into strips called, anchors." More information at https://www.utsa.edu/today/2021/03/story/ghannoum-wins-award-concrete-CFRP.html

12/2/2021 at 1:39 PM

Helpful?

Record Added:

10/30/2013

Record Updated:

7/28/2023 5:31 AM EDT

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