CLOSED-FORM HIGH-ORDER ANALYSIS OF RC BEAMS STRENGTHENED WITH FRP STRIPS

This paper presents a closed-form, high-order analytical solution for analysis of concrete beams strengthened with externally bonded fiber-reinforced plastic (FRP) strips. The model is based on equilibrium and deformations compatibility requirements in and between all parts of the strengthened beam. The governing equations representing the behavior of the strengthened beam, along with the appropriate boundary and continuity conditions, are derived and solved with closed-form analytical solutions. Comparison of the closed-form, high-order model with other simplified approaches, based on 1- and 2-parameter elastic foundation concepts, is included. It is shown that the current high-order model can be reduced, by omitting appropriate terms, to the simplified theories. A numerical example of a typical RC beam strengthened with an externally bonded FRP strip is discussed with emphasis on the shear and peeling stress distributions at the edge of the FRP strip. Stress analysis results concerning the edge stresses determined by the high-order model are compared with those determined by elastic foundation models and finite elements. A parametric study that characterizes the main parameters governing the magnitude and intensity of the edge stresses is performed. The paper concludes with a summary and recommendations for the design of the strengthened beam.

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  • English

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  • Accession Number: 00794573
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 22 2000 12:00AM