000011783 001__ 11783
000011783 005__ 20141205155946.0
000011783 04107 $$aeng
000011783 046__ $$k2008-10-12
000011783 100__ $$aTaflambas, Ioannis M.
000011783 24500 $$aInvestigation of the Effect of the Ground Motion Characteristics on the Ry-μ Relation for the Inelastic Response of SDOF Structures

000011783 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011783 260__ $$b
000011783 506__ $$arestricted
000011783 520__ $$2eng$$aIn this study, the effect of the ground motion frequency content, especially the period of the directivity pulse in near field records, on the relationship between the reduction factor Ry and the ductility demand µ is investigated. A large sample of strong motion records showing near field characteristics of forward and backward directivity, is examined. The regimes, in which the known assumptions of equal displacement and equal energy are valid, are re-evaluated taking into account the period of the directivity pulse contained in the ground motion. The results show that, for near field records with directivity effects, the thresholds of these regions depend on the period of the directivity pulse, which is related to the magnitude of the earthquake. This observation is valid for ground motions with intense and weak forward directivity and backward directivity effects. This response implies that the equal displacement rule (Ry=µ), which is incorporated in most earthquake design regulations for structures with a period larger than Tc, with Tc being the threshold between the constant acceleration and the constant velocity regions on the response spectrum, might underestimate significantly the ductility demand for structures with long periods. In this analysis, a new method for deriving the pulse duration in case of weak forward and for backward directivities is proposed and a new limit for the regime, in which the equal displacement assumption applies, is defined.

000011783 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011783 653__ $$aNear field, ductility, inelastic response, reduction factor, behaviour factor.

000011783 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011783 720__ $$aTaflambas, Ioannis M.$$iPsycharis, Ioannis N.
000011783 8560_ $$ffischerc@itam.cas.cz
000011783 8564_ $$s251859$$uhttps://invenio.itam.cas.cz/record/11783/files/02-0104.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 02-0104.
000011783 962__ $$r9324
000011783 980__ $$aPAPER