A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Ductile design of reinforced concrete beams retrofitted with fiber reinforced polymer plates
The use of high-strength plates to increase the tension steel area of reinforced concrete beams is a common retrofitting method. While the FRP plate increases the overall moment capacity of the beam, from the point of view of seismic performance the additional tensile area introduced may result in less ductility, generally characterized by brittle failure of concrete flexural compression. In this paper, an analytical method is derived for determining the allowable area of FRP plate to achieve a targeted ductility value specified by the designer. Design examples are presented and comparisons with numerical and experimental data are made. The derivation of equilibrium and compatibility equations for a rectangular cross section is presented, and the solution to the nonlinear equation for determining the allowable plate area is demonstrated with examples. A simplified version of the method is derived, based on regression analysis, to relate the curvature ductility to the FRP plate ratio. It is noted that additional conditions need to be checked to ensure ductile performance, such as local failure of the concrete layer between tension reinforcement and FRP plate or debonding of the plate itself.
Ductile design of reinforced concrete beams retrofitted with fiber reinforced polymer plates
The use of high-strength plates to increase the tension steel area of reinforced concrete beams is a common retrofitting method. While the FRP plate increases the overall moment capacity of the beam, from the point of view of seismic performance the additional tensile area introduced may result in less ductility, generally characterized by brittle failure of concrete flexural compression. In this paper, an analytical method is derived for determining the allowable area of FRP plate to achieve a targeted ductility value specified by the designer. Design examples are presented and comparisons with numerical and experimental data are made. The derivation of equilibrium and compatibility equations for a rectangular cross section is presented, and the solution to the nonlinear equation for determining the allowable plate area is demonstrated with examples. A simplified version of the method is derived, based on regression analysis, to relate the curvature ductility to the FRP plate ratio. It is noted that additional conditions need to be checked to ensure ductile performance, such as local failure of the concrete layer between tension reinforcement and FRP plate or debonding of the plate itself.
Ductile design of reinforced concrete beams retrofitted with fiber reinforced polymer plates
Duktilitätsorientierte Konstruktion von mit faserverstärkten Kunststoffplatten verstärkten Stahlbetonträgern
Lee, Tai-Kuang (author) / Pan, Austin D.E. (author) / Ma, Michael J.L. (author)
Journal of Composites for Construction ; 8 ; 489-500
2004
12 Seiten, 9 Bilder, 2 Tabellen, 17 Quellen
Article (Journal)
English
Ductile Design of Reinforced Concrete Beams Retrofitted with Fiber Reinforced Polymer Plates
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