Ground motion input in seismic evaluation studies: impacts on risk assessment of uniform hazard spectra

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Conservatism and variability in seismic risk estimates are studied: effects of uniform hazard spectrum (UHS) are examined for deriving probabilistic estimates of risk and in-structure demand levels, as compared to the more-exact use of realistic time history inputs (of given probability) that depend explicitly on magnitude and distance. This approach differs from the conventional in its exhaustive treatment of the ground-motion threat and in its more detailed assessment of component responses to that threat. The approximate UH-ISS (in-structure spectrum) obtained based on UHS appear to be very close to the more-exact results directed computed from scenario earthquakes. This conclusion does ... continued below

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128 p.

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Wu, S.C. & Sewell, R.T. July 1, 1996.

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Description

Conservatism and variability in seismic risk estimates are studied: effects of uniform hazard spectrum (UHS) are examined for deriving probabilistic estimates of risk and in-structure demand levels, as compared to the more-exact use of realistic time history inputs (of given probability) that depend explicitly on magnitude and distance. This approach differs from the conventional in its exhaustive treatment of the ground-motion threat and in its more detailed assessment of component responses to that threat. The approximate UH-ISS (in-structure spectrum) obtained based on UHS appear to be very close to the more-exact results directed computed from scenario earthquakes. This conclusion does not depend on site configurations and structural characteristics. Also, UH-ISS has composite shapes and may not correspond to the characteristics possessed a single earthquake. The shape is largely affected by the structural property in most cases and can be derived approximately from the corresponding UHS. Motions with smooth spectra, however, will not have the same damage potential as those of more realistic motions with jagged spectral shapes. As a result, UHS-based analysis may underestimate the real demands in nonlinear structural analyses.

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128 p.

Notes

INIS; OSTI as TI96013811

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  • Other Information: PBD: Jul 1996

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  • Other: TI96013811
  • Report No.: NUREG/CR--6468
  • DOI: 10.2172/285223 | External Link
  • Office of Scientific & Technical Information Report Number: 285223
  • Archival Resource Key: ark:/67531/metadc668549

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  • July 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • April 7, 2016, 9:09 p.m.

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Wu, S.C. & Sewell, R.T. Ground motion input in seismic evaluation studies: impacts on risk assessment of uniform hazard spectra, report, July 1, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc668549/: accessed January 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.