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Shvoong Home>Science>Architecture>ANALYTICAL PREDICTION OF DEBONDING FAILURES IN RC BEAMS STRENGTHENED IN SHEAR WITH NSM FRP REINFORCE Summary

ANALYTICAL PREDICTION OF DEBONDING FAILURES IN RC BEAMS STRENGTHENED IN SHEAR WITH NSM FRP REINFORCE

Article Summary   by:toffi_75     Original Authors: Andrea Rizzo; Laura De Lorenzis
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The
shear capacity of reinforced concrete (RC) members can be successfully
increased using near-surface mounted (NSM) fiber-reinforced polymer (FRP)
reinforcement. Tests on NSM-strengthened beams have shown that failure is
controlled by diagonal tension associated to debonding between the NSM
reinforcement and the concrete substrate. In absence of steel stirrups and/or
when the spacing of the NSM reinforcement is large, debonding involves
separately each of the bars crossed by the critical shear crack (type-I
failure). The presence of steel stirrups, combined with a relatively small
spacing of the reinforcement, may originate a debonding failure mechanism
involving the lateral concrete covers of the steel stirrups (type-II failure).
Thus, an analytical model able to encompass both failure modes must be
developed. This paper extends a previous simplified model to predict the FRP
contribution to the shear capacity when type-I failure occurs. The model,
suitable for immediate design use, assumes a complete redistribution of the
bond stresses along the failure interface at ultimate. Experimental results
from previous test programs are compared to the model predictions.
Published: August 29, 2007   
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