Ductility-strength and strength-ductility relations for a constant yield displacement seismic design procedure
Open access
Date
2023-07Type
- Journal Article
Abstract
The modern engineering approach to design of structures exposed to rare but intense earthquakes allows for their inelastic response. Models and tools to rapidly but accurately assess the extent of the inelastic response of the structure and control its performance are, therefore, essential. We develop a closed-form μ−R∗−Sd,y relation between the ductility μ and the strength reduction factor R*, as well as its approximate inverse R*-μ-Sd,y relation, both functions of the SDOF oscillator yield displacement Sd,y, not its vibration period T. The fundamental vibration period of the structure varies during the iterative design process focused on modifying its strength. However, the yield displacement of the structure is practically invariant with respect to the strength of the structure, as it depends primarily on its geometry and material properties. We use these relations to formulate a constant yield displacement seismic design procedure and exemplify it. Noting the structure of the developed relations, we use dimensional analysis to formulate a version of the ductility-strength and strength-ductility relations that are dimensionless and independent of the seismic hazard intensity. These novel, dimensionless master relations are the μ-R*-H/B-κ ductility-strength and the R*-μ-H/B-κ strength-ductility relations. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000611696Publication status
publishedExternal links
Journal / series
Bulletin of Earthquake EngineeringVolume
Pages / Article No.
Publisher
KluwerSubject
Constant yield displacement design; Displacement-based design; Seismic designOrganisational unit
03930 - Stojadinovic, Bozidar / Stojadinovic, Bozidar
Funding
184805 - Quasi-Dynamic Seismic Performance-Based Design Procedure (SNF)
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