Deformations of concrete members at yielding and ultimate under monotonic or cyclic loading (including repaired and retrofitted members)

TitleDeformations of concrete members at yielding and ultimate under monotonic or cyclic loading (including repaired and retrofitted members)
Publication TypeReport
Year of Publication2009
Biskinis D, Fardis MN
Date PublishedJanuary 2009
InstitutionUniversity of Patras, Department of Civil Engineering
ISBN Number978-960-89691-6-2
Abstract

Models are developed/calibrated for the moment, the chord rotation and the secant stiffness at flexural yielding, as well as the ultimate deformation of beams,rectangular columns or walls and members of T-, H-, U- or hollow rectangular section, on the basis of a databank of tests on RC members with continuous bars. Simple criteria are developed for the identification of adverse shear effects on the yield moment or the ultimate deformation. The models for the moment and the chord rotation at flexural yielding apply only to members whose yield moment is not reduced by shear effects. The models developed employ simple, explicit expressions suitable for practical application, without moment-curvature analysis. They are extended to members with bars lap-spliced starting at the end section, as well as to those retrofitted with Fibre-Reinforced-Polymer (FRP) or concrete jackets before or after pre-damage by cyclic loading. The effects of biaxial loading on member yielding and ultimate deformation are examined. The proposed models have been adopted in Part 3 of Eurocode 8 for the seismic assessment and retrofitting of existing concrete buildings, or represent an advancement over models proposed earlier by the authors and therein.

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