000011779 001__ 11779
000011779 005__ 20141205155945.0
000011779 04107 $$aeng
000011779 046__ $$k2008-10-12
000011779 100__ $$aSyntzirma, Despina V.
000011779 24500 $$aLoad History Effects on Deformation Capacity of Flexural Members Limited by Bar Buckling

000011779 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011779 260__ $$b
000011779 506__ $$arestricted
000011779 520__ $$2eng$$aPost earthquake reconnaissance reports illustrate that failure of reinforced concrete (R.C.) members often involve buckling of reinforcement, an observation suggesting that this phenomena is prerequisite for the necessary reduction of member length (shortening) that marks failure under transverse cyclic displacement reversals. From previous experimental research it is known that occurrence of buckling is linked to displacement history. In the present paper the problem of bar buckling in the plastic hinge region as a limiting factor of deformation capacity of reinforced concrete members is expressed, using as a vehicle the hysteretic stress−strain model of the reinforcement, in terms of the imposed displacement amplitude under cyclic reversals. Through the derived analytical expressions it is shown that when controlled by bar buckling, deformation capacity cannot be defined uniquely as it varies with the path of applied load. This explains in part the wide scatter of experimental results regarding drift capacity, which is particularly intense in cases where premature modes of failure are suppressed and the response is controlled by flexure. A corollary to this finding, which refers to the established procedures of displacement−based design, is that quantifiable indices of deformation capacity, associated with the various failure modes, need be expressed as lower bounds, to reflect the wide range of expected values as these might be limited by the occurrence of buckling of compression reinforcement under realistic earthquakes.

000011779 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011779 653__ $$abar buckling, rotation capacity, ductility, reinforcement, deformation, instability, failure

000011779 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011779 720__ $$aSyntzirma, Despina V.$$iPantazopoulou, Stavroula J.$$iAschheim, Mark
000011779 8560_ $$ffischerc@itam.cas.cz
000011779 8564_ $$s219588$$uhttps://invenio.itam.cas.cz/record/11779/files/05-01-0569.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 05-01-0569.
000011779 962__ $$r9324
000011779 980__ $$aPAPER