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- W1556553071 abstract "The current seismic provisions specify an earthquake load level for structural design based on a uniform-hazard elastic response spectrum by addressing key uncertainties associated with seismic hazard assessment. Among various sources of uncertainties, variability regarding the orientation of horizontal ground motion measures can have important impact on reliability of structures. Despite the popularity of characterizing the orientation of elastic seismic demand, the orientation effects of inelastic seismic demand have not been examined extensively. This study investigates the orientation dependency of the peak ductility demand of inelastic single-degree-of-freedom systems with known strength by accounting for record-to-record variability of seismic effects. The probabilistic characteristics of the peak ductility demand in recording directions are compared with those in the maximum/minimum response directions and the major/minor principal directions. The analysis results indicate that the peak ductility demand depends on how input ground motions are defined in terms of record orientation. The orientation dependency of the inelastic seismic demand can be explained by the “response spectral shape effects” of ground motion records in specific directions. The results have an important implication in the current earthquake engineering practice, as they suggest that separate peak ductility demand models should be used for different ground motion measures to evaluate the seismic performance of structures consistently without bias. important. Such effects can be addressed in PSHA by using an orientation-dependent ground motion measure (Hong & Goda 2007) or by implementing conversion/adjustment factors for the orientation/ directivity effects (Somerville et al. 1997, Tothong et al. 2007, Watson-Lamprey & Boore 2007, Huang et al. 2008). The orientation of the maximum elastic seismic demand over exhaustive record rotation depends on vibration period (Hong & Goda 2007), and does not necessarily coincide with the faultnormal direction, if a site is more than 3–5 km away from the fault rupture zone (Watson-Lamprey & Boore 2007, Huang et al. 2009). An alternative way to explicitly consider the orientation effects is to define ground motions in the principal directions based on the Arias intensity tensor (Arias 1970, Penzien & Watabe 1975). Smeby & Der Kiureghian (1985) utilized uncorrelated characteristics of three (rotated) components in the principal directions to extend a response spectrum method for linear structures subject to multi-component seismic input (known as a CQC3 rule). Hong & Goda (2010) investigated a relationship between the orientation of the maximum elastic seismic demand over exhaustive record rotation and the major principal direction on the horizontal plane, and showed that the two orientations do not necessarily coincide." @default.
- W1556553071 created "2016-06-24" @default.
- W1556553071 creator A5042581179 @default.
- W1556553071 date "2011-07-19" @default.
- W1556553071 modified "2023-09-28" @default.
- W1556553071 title "Orientation dependency of peak ductility demand for seismic performance evaluation" @default.
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- W1556553071 doi "https://doi.org/10.1201/b11332-227" @default.
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