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Experimental behavior of reinforced concrete beams strengthened with prestressed CFRP shear straps


Type

Article

Change log

Authors

Kesse, GK 
Lees, JM 

Abstract

One promising means of increasing the capacity of existing shear-deficient beams is to strengthen the structure using external prestressed carbon fiber reinforced polymer (CFRP) straps. In this system, layers of CFRP tape are wrapped around a beam to form a strap that acts like a discrete unbonded vertical prestressing tendon. Experiments were undertaken to investigate the influence of the strap spacing, the strap stiffness, the initial strap prestress level and/or any preexisting damage on the strengthened behavior, and mode of failure. An unstrengthened control beam was tested and failed in shear. In contrast, all of the strengthened beams showed a significant increase in their ultimate load capacity with several of the strengthened beams failing in flexure. A number of different failure modes were noted and initial guidelines on the design parameters that influence the propensity for a particular failure mode were developed.

Description

Keywords

4005 Civil Engineering, 40 Engineering

Journal Title

Journal of Composites for Construction (ASCE)

Conference Name

Journal ISSN

1090-0268
1943-5614

Volume Title

11

Publisher

American Society of Civil Engineers (ASCE)
Sponsorship
EMPA