Influence of EB-CFRP on Cracks for Reinforced Concrete Beams Strengthening

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Title: Influence of EB-CFRP on Cracks for Reinforced Concrete Beams Strengthening

Author(s): Emmanuel Ferrier, Carmelo Caggegi, and Laurent Michel

Publication: Special Publication

Volume: 327

Issue:

Appears on pages(s): 44.1-44.16

Keywords: External Bonding strengthening, Cracks, serviceability, axial stiffness

Date: 11/1/2018

Abstract:
In design of structures, both the ultimate limit state (ULS) and the serviceability limit state of the structure must be verified. Carbon fiber reinforced polymer (CFRP) materials have high strength, and large amounts of CFRP are not needed for ULS. On the other hand, CFRP may be needed to introduce enough stiffness for meeting the serviceability design criteria and reduce the crack of concrete. The effects of externally bonded composite plates on the mechanical behavior of a cracked RC beam, loaded in flexure, are obtained by an experimental approach. The problem of crack width prediction is addressed. The model values are compared to experimental data obtained using a digital image correlation method. The crack width and spacing is measured as a function of load to analyze crack propagation. Finally, the study focuses on the validation of the codes model for calculating crack widths and curvatures in strengthened beams.