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首页> 美国政府科技报告 >Ground Motion Input in Seismic Evaluation Studies. Impacts on Risk Assessment of Uniform Hazard Spectra
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Ground Motion Input in Seismic Evaluation Studies. Impacts on Risk Assessment of Uniform Hazard Spectra

机译：地震评估研究中的地面运动输入。对均匀危险光谱风险评估的影响

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This report documents research on the subject of conservatism and variability in seismic risk estimates. Particularly, it examines the effects of the uniform hazard spectrum (UHS) 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. The approach differs significantly from the conventional procedure in its exhaustive treatment of the ground-motion threat, and in its more detailed assessment of component responses to that threat. It is found that the approximate uniform hazard instructure spectrum (UH-ISS) obtained based on UHS appear to be very close to the more-exact results directly computed from scenario earthquakes. The conclusion does not depend on site configurations and structural characteristics. In addition, UH-ISS has composite shapes and may not correspond to the characteristics possessed in 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 non-linear structural analyses.

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