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Polymers 2016, 8(4), 107; doi:10.3390/polym8040107

A Seismic Strengthening Technique for Reinforced Concrete Columns Using Sprayed FRP

1
School of Architecture, Chonnam National University, Gwangju 61186, Korea
2
Departmrnt of Architectural Engineering, Korea National University of Transpotation, Chungju 27469, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 10 February 2016 / Revised: 8 March 2016 / Accepted: 18 March 2016 / Published: 24 March 2016
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Abstract

Conventional methods for seismic retrofitting of concrete columns include reinforcement with steel plates or steel frame braces, as well as cross-sectional increments and in-filled walls. However, these methods have some disadvantages, such as the increase in mass and the need for precise construction. Fiber-reinforced polymer (FRP) sheets for seismic strengthening of concrete columns using new light-weight composite materials, such as carbon fiber or glass fiber, have been developed, have excellent durability and performance, and are being widely applied to overcome the shortcomings of conventional seismic strengthening methods. Nonetheless, the FRP-sheet reinforcement method also has some drawbacks, such as the need for prior surface treatment, problems at joints, and relatively expensive material costs. In the current research, the structural and material properties associated with a new method for seismic strengthening of concrete columns using FRP were investigated. The new technique is a sprayed FRP system, achieved by mixing chopped glass and carbon fibers with epoxy and vinyl ester resin in the open air and randomly spraying the resulting mixture onto the uneven surface of the concrete columns. This paper reports on the seismic resistance of reinforced concrete columns controlled by shear strengthening using the sprayed FRP system. Five shear column specimens were designed, and then strengthened with sprayed FRP by using different combinations of short carbon or glass fibers and epoxy or vinyl ester resins. There was also a non-strengthened control specimen. Cyclic loading tests were carried out, and the ultimate load carrying capacity and deformation were investigated, as well as hysteresis in the lateral load-drift relationship. The results showed that shear strengths and deformation capacities of shear columns strengthened using sprayed FRP improved markedly, compared with those of the control column. The spraying FRP technique developed in this study can be practically and effectively used for the seismic strengthening of existing concrete columns. View Full-Text
Keywords: carbon fiber; concrete columns; epoxy; glass fiber; strengthening; sprayed FRP; vinyl ester carbon fiber; concrete columns; epoxy; glass fiber; strengthening; sprayed FRP; vinyl ester
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, K.S.; Lee, B.Y.; Seo, S.Y. A Seismic Strengthening Technique for Reinforced Concrete Columns Using Sprayed FRP. Polymers 2016, 8, 107.

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