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Analytical study of corroded steel-FRP confined concrete bond under fatigue cyclic loading

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dc.contributor.author Abbas, Safeer
dc.date.accessioned 2010-06-16T21:07:32Z
dc.date.available 2010-06-16T21:07:32Z
dc.date.copyright 2010 en
dc.date.issued 2010-06-16T21:07:32Z
dc.identifier.uri http://hdl.handle.net/2429/25801
dc.description.abstract The steel-concrete bond and the cracking behaviour of concrete affect the performance of reinforced concrete structures. This is due to the fact that the transfer of forces between the steel and the concrete are accomplished through the bond. The bond between the steel and the concrete is affected by many factors such as corrosion of reinforcement, type of applied loading, and the confinement level. Reinforcement corrosion is one of the primary causes of the loss of steel-concrete bond. On the other hand, an accumulation of bond damage occurs due to the application of fatigue cyclic loading, as in the case of bridges and marine structures. It is known that fibre reinforced polymer (FRP) confinement improves the bond strength, even in the case of corroded reinforcing steel bars. The objective of this thesis was to develop an analytical tool for structural engineers to evaluate the corroded steel-FRP confined concrete bond under fatigue cyclic loading. Two models have been developed; 1) slip-fatigue model; and 2) bond stress-slip model. These models considered the effect of corrosion of reinforcement, the external confinement provided by the FRP sheets, and the fatigue cyclic loading. Slip after ‘N’ number of cycles for unwrapped and FRP wrapped cases were developed as a function of the initial slip, the final slip, and the fatigue bond life. These models were capable of capturing the experimental behaviour reported in the literature. Slip-life models for unwrapped and FRP wrapped beam specimens were developed using non linear regression analysis. Harajli et al. (2004) static bond stress-slip law was modified in order to model the bond stress-slip behaviour for the unwrapped and FRP wrapped beam specimen under monotonic and cyclic loading. The proposed cyclic bond stress-slip behaviour followed the monotonic bond stress-slip envelope and satisfactorily modeled the experimental behaviour. From the principles of statics of bond and using the derived cyclic bond stress-slip envelope, an equation to calculate the required development length of steel reinforcement was derived. The proposed equation is dependent on the material and the geometrical properties of a structural member. The derived equation was able to satisfactory predict the fatigue bond life. en
dc.language.iso eng en
dc.publisher University of British Columbia
dc.rights Attribution-NonCommercial 2.5 Canada
dc.rights.uri http://creativecommons.org/licenses/by/3.0/
dc.title Analytical study of corroded steel-FRP confined concrete bond under fatigue cyclic loading en
dc.type Electronic Thesis or Dissertation
dc.degree.name Master of Applied Science - MASc en
dc.degree.discipline Civil Engineering en
dc.degree.grantor University of British Columbia en
dc.date.graduation 2010-11 en
dc.degree.campus UBCO en
dc.description.scholarlevel Graduate en

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