Next Article in Journal
Transient Network at Large Deformations: Elastic–Plastic Transition and Necking Instability
Previous Article in Journal
Interpenetration of Natural Polymer Aerogels by Supercritical Drying
Article Menu

Export Article

Open AccessArticle
Polymers 2016, 8(4), 107;

A Seismic Strengthening Technique for Reinforced Concrete Columns Using Sprayed FRP

School of Architecture, Chonnam National University, Gwangju 61186, Korea
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
Full-Text   |   PDF [6620 KB, uploaded 24 March 2016]   |  


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

Figure 1

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).

Share & Cite This Article

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top