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Direct displacement-based seismic design

Priestley, MJN; Grant, DN; Blandon, CA; (2005) Direct displacement-based seismic design. In: Proceedings of the New Zealand Society for Earthquake Engineering Conference. : Wairakei, New Zealand.

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Abstract

There has been considerable discussion recently in New Zealand about the relative merits of displacement-based, and displacement-focused force-based seismic design. This paper puts the case for direct displacement-based seismic design. It is shown that the emphasis on secant stiffness to maximum displacement, rather than initial stiffness (as in force-based seismic design) is important for rational force-distribution to different seismic-resisting structural elements, and in most cases obviates the need for iteration in the design process, which is inherent in displacement-focused force-based seismic design. It is shown that the influence of hysteretic characteristics has been underestimated in recent force-based studies. These assertions are supported by results of recent analytical studies, which have included refinement of ductility/equivalent-viscous damping relationships, and an examination of the important (and largely ignored) role of “elastic” damping in inelastic time-history analyses.

Type:Proceedings paper
Title:Direct displacement-based seismic design
Additional information:keywords: By me, Damping
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Civil, Environmental and Geomatic Engineering

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