ADVANCED FIBER-REINFORCED POLYMER COMPOSITES AD EXTERNAL REINFORCEMENT OF CONCRETE STRUCTURES: LONG-TERM BEHAVIOR

Strengthening of concrete structures with fiber reinforced plastic (FRP) composites epoxy-bonded to their tension faces appears to be a method with high potential of increasing the strength and stiffness of existing members. In this work, the authors aim at developing a fundamental understanding of the time-dependent (creep and shrinkage) behavior of reinforced concrete beams strengthened with FRP laminates. An analytical procedure is given first for the deformation of cross sections based on the age-adjusted effective modulus method for concrete, Findley's model for composite materials and a stress relaxation procedure to yield the cross section stresses and strains as a function of time. Parametric studies assessing the effect of the type and area fraction of composite material and the area fraction of steel reinforcement on the long-term response of strengthened elements are also presented. Finally, the analytical model is employed to predict the deflections of concrete beams strengthened with FRP laminates of different thicknesses, and an experimental program is also described confirming the analysis.

• Corporate Authors:

  Massachusetts Institute of Technology

  Center for Construction Research and Education, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Plevris, N
  • Triantafillou, T C
• Publication Date: 1992-1

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 36 p.

Subject/Index Terms

• TRT Terms: Beams; Creep; Deflection; Fiber reinforced plastics; Forecasting; Laminates; Mathematical models; Reinforced concrete; Shrinkage; Strength of materials; Strengthening (Maintenance); Thickness
• Uncontrolled Terms: Analytical models; Reinforced concrete beams
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; Materials; I24: Design of Bridges and Retaining Walls; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 00629165
• Record Type: Publication
• Report/Paper Numbers: PACT Rept No. 92-3, CCRE 92-5
• Contract Numbers: DAAL03-87-K-0005
• Files: TRIS
• Created Date: May 27 1993 12:00AM