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American Society for Testing and Materials

*Co-chairs of the subcommittee that prepared this document. Note: The committee acknowledges the contribution of associate member Paul Kelley. ACI encourages the development and appropriate use of new and emerging technologies through the publication of the Emerging Technology Series. This series presents information and recommendations based on available test data, technical reports, limited experience with field applications, and the opinions of committee members. The presented information and recommendations, and their basis, may be less fully developed and tested than those for more mature technologies. This report identifies areas in which information is believed to be less fully developed, and describes research needs. The professional using this document should understand the limitations of this document and exercise judgment as to the appropriate application of this emerging technology.

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Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures

Design-oriented stress–strain model for FRP-confined concrete

External bonding of steel plates has been used to strengthen deficient reinforced-concrete structures since the 1960s. In recent years, fiber-reinforced polymer (FRP) plates have been increasingly used to replace steel plates due to their superior properties. A key issue in the design of an effective retrofitting solution using externally bonded plates is the end anchorage strength. This paper first presents a review of current anchorage strength models for both FRP-to-concrete and steel-to-concrete bonded joints under shear. These models are then assessed with experimental data collected from the literature, revealing the deficiencies of all existing models. Finally, a new simple and rational model is proposed based on an existing fracture mechanics analysis and experimental observations. This new model not only matches experimental observations of bond strength closely, but also correctly predicts the effective bond length. The new model is thus suitable for practical application in the design of FRP-to-concrete as well as steel-to-concrete bonded joints.

Anchorage strength models for FRP and steel plates bonded to concrete

Bond-slip models for FRP sheets/plates bonded to concrete

Preface Notation FRP Composites for Strengthening RC Structures Bond Strength of FRP-to-concrete Joints Flexural Strengthening of Beams Shear Strengthening of Beams Flexural Strengthening of Slabs Strengthening of Axially and Eccentrically Loaded Columns Seismic Retrofit of Columns Index

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Jinguang Teng

Papers

Design-oriented stress–strain model for FRP-confined concrete

FRP: Strengthened RC Structures

Anchorage strength models for FRP and steel plates bonded to concrete

Bond-slip models for FRP sheets/plates bonded to concrete

Performance and application of a design-oriented stress-strain model for FRP-confined concrete