"Fiber reinforced polymers (FRP) has become increasingly used for the retrofit of aging structures for increased lifespans and for the rapid repair of damaged structures. It has many advantageous such as ease in rapid installation, high strength-to-weight ratio, and corrosion resistance. The main disadvantage of the material is brittle behavior with little warning of impending failures. The main objective of this study is to develop a new system of FRP that exhibits a more ductile behavior. To achieve this objective, separate sheets of FRP were applied at various staged levels and thus engaged at different loads. Ductile behavior was evaluated based on the ability of the FRP sheets to fail the conventional layers before the staged layers. To realize the staged installation of FRP sheets, two methods were explored in this thesis. The first method is to apply FRP sheets under various preloads up to the design load. Such staged FRP sheets theoretically have uniformly distributed debonding points but practically result in irregular spacing between adjacent debonding points. The second method is to intentionally create intermittent debonding areas in arch shape so that regular spacing between debonding areas can be achieved as FRP sheets are applied. In order to evaluate the effectiveness of the new FRP system, a total of 25 thin steel sheets were tension tested to determine their stress-strain curves with various implementations of FRP sheets under preloading. Additionally, 14, 11 ft x 6 in x 18 in reinforced concrete beams were tested to evaluate the effectiveness of FRP sheets directly applied in stage. Test results indicate that the new FRP system is a promising approach to improve the behavior of FRP applications in civil engineering from brittle to pseudo ductile due to nonlinear geometry effects"--Abstract, page iii.
Volz, Jeffery S.
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
Missouri University of Science and Technology
xiii, 108 pages
© 2012 Laura Marie Rathe, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Concrete -- Ductility
Reinforced concrete -- Stress corrosion
Reinforced concrete -- Testing
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Rathe, Laura Marie, "Behavior of staged externally bonded carbon fiber reinforced polymer sheets for improved ductility" (2012). Masters Theses. 5140.