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Strengthening of reinforced concrete beams with externally bonded fiber-reinforced-plastic plates: design guidelines for shear and flexure
Canadian Journal of Civil Engineering, 25 (4): 692--704 (1998)
Аннотация
This paper presents a comprehensive design approach for reinforced
concrete flexural beams and unidirectional slabs strengthened with
externally bonded fiber-reinforced-plastic (FRP) plates. The approach
complies with the Canadian Concrete Standard. The paper is divided
into two parts, namely flexural strengthening and shear strengthening.
In the first part, analytical models are presented for two families
of failure modes: classical modes such as crushing of concrete in
compression and tensile failure of the laminate, and premature modes
such as debonding of the plate and ripping off of the concrete cover.
These models are based on the common principles of compatibility
of deformations and equilibrium of forces. They can be used to predict
the ultimate strength in flexure that can be achieved by such elements,
given the FRP cross-sectional area, or conversely, the required FRP
cross-sectional area to achieve a targeted resisting moment for rehabilitated
flexural elements. In the second part, design equations are derived
to enable calculation of the required cross-sectional area of shear
lateral FRP plates or strips for four plating patterns: vertical
strips, inclined strips, wings, and U sheet jackets. A step by step
procedure is also presented along with an easy to use flow chart.
Finally, a numerical design example is provided to demonstrate the
applicability of the approach. This study is believed to be timely
and very useful for the practicing engineer
тэги
- adhesive.
- beams,
- concrete
- design,
- failure,
- flexure,
- frp
- mode
- of
- plates,
- reinforced
- shear,
- slabs,
- strengthening
