Shear Strengthening of RC T-Beams Using Mechanically Anchored Unbonded Dry Carbon Fiber Sheets
This research studies the feasibility and effectiveness of a new method of strengthening existing RC T-beams in shear by using mechanically anchored unbonded dry carbon fiber (CF) sheets. This method eliminates the debonding of epoxy-bonded carbon-fiber-reinforced polymer (CFRP) sheets and utilizes the full capacity of dry CF sheets. In this method, dry CF sheets are wrapped around and bonded to 2 steel rods. The rods are then anchored to the corners of the web-flange intersection of the T-beam with mechanical bolts. This makes a U-shaped dry CF jacket around the web which increases the shear strength of the T-beam using the privilege of higher tensile strength and modulus of elasticity of dry CF compared to composite CFRP. Three RC T-beams with shear span-to-depth ratio of 2.0 were tested under increasing monotonic load until failure. The pilot tests were done as a proof-of-concept of the effectiveness of the proposed method in increasing the shear capacity of the RC T-beams. The first T-beam, which was tested as the control beam, failed in shear. The second beam was strengthened by using a U-shaped CFRP sheet that was externally bonded to the web of the beam in the shear zones. The third beam was strengthened by using an anchored U-shaped dry CF sheet. The test results showed that the beam strengthened by the new mechanically anchored dry CF had about 48% increase in shear capacity as compared to the control beam and 16% increase in shear capacity as compared to the beam strengthened by CFRP epoxy-bonding method.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/08873828
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Supplemental Notes:
- Abstract reprinted with permission from ASCE
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Authors:
- Galal, Khaled
- Mofidi, Amir
- Publication Date: 2010-1
Language
- English
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 31-39
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Serial:
- Journal of Performance of Constructed Facilities
- Volume: 24
- Issue Number: 1
- Publisher: American Society of Civil Engineers
- ISSN: 0887-3828
- Serial URL: http://ascelibrary.org/toc/jpcfev/27/1
Subject/Index Terms
- TRT Terms: Bridge engineering; Bridge members; Carbon fibers; Fiber reinforced materials; Jacketing (Strengthening); Reinforced concrete bridges; Shear reinforcement; Shear strength; Sheets; Structural strengthening; T beams
- Subject Areas: Bridges and other structures; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 01152130
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 16 2010 6:12AM