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Materials 2015, 8(7), 4131-4146; doi:10.3390/ma8074131

The Tension-Stiffening Contribution of NSM CFRP to the Behavior of Strengthened RC Beams

1
Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
2
Architecture Discipline, Science, Engineering and Technology School, Khulna University, 9208 Khulna, Bangladesh
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 30 April 2015 / Revised: 17 June 2015 / Accepted: 26 June 2015 / Published: 8 July 2015
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [1108 KB, uploaded 8 July 2015]   |  

Abstract

Tension stiffening is a characteristic behavior of reinforced concrete (RC) beams which is directly affected by the bond-slip property of steel bar and concrete interfaces. A beam strengthened with a near-surface mounted (NSM) technique would be even more affected by tension stiffening, as the NSM reinforcement also possess a bond-slip property. Yet assessing how much the tension stiffening of NSM contributes to the behavior of RC beams is difficult due to the fact that bond-slip effects cannot be directly incorporated into a strain-based moment-curvature analysis. As such, the tension stiffening is typically incorporated through various empirical formulations, which can require a great deal of testing and calibrations to be done. In this paper a relatively new method, which can be called the mechanics-based segmental approach, is used to directly simulate the tension stiffening effect of NSM reinforcements on RC beams, without the need for empirical formulations to indirectly simulate the tension stiffening. Analysis shows that the tension stiffening of NSM fiber reinforced polymer (FRP) contributes a significant portion to the stiffness and strength of the strengthened RC beam not only during serviceability, but at all load levels. View Full-Text
Keywords: reinforced concrete; tension stiffening; partial interaction; near-surface mounted (NSM); fiber reinforced polymer (FRP) reinforced concrete; tension stiffening; partial interaction; near-surface mounted (NSM); fiber reinforced polymer (FRP)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shukri, A.A.; Darain, K.M.; Jumaat, M.Z. The Tension-Stiffening Contribution of NSM CFRP to the Behavior of Strengthened RC Beams. Materials 2015, 8, 4131-4146.

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