Evaluation of earthquake ground motions by empirical analysis |
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| Authors: | Bao‐Ding Ku Chin‐Hsiung Loh Yeong‐Tien Yeh |
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| Affiliation: | 1. Center for Earthquake Engineering Research , National Taiwan University , Taipei, Taiwan, 10617, R.O.C.;2. Department of Civil Engineering , National Taiwan University , Taipei, Taiwan, 10617, R.O.C.;3. Institute of Earth Sciences , Academia Sinica , Taipei, Taiwan, 10529, R.O.C. |
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| Abstract: | Abstract The design ground motion is based on the seismicity and geologic conditions at the site and expressed in such a manner that it can be applied to the dynamic analysis of structures. For the seismic analysis of safety‐related structures, design ground motions are made based on the evaluation of earthquake ground motion by empirical analysis, of which some important features are discussed in the present study: (1) Develop reasonable peak ground acceleration attenuation form for the Taiwan area. The proposed attenuation forms take into account the PGA level at the near‐field which compensates for the insufficiency of the available data base. (2) Generation of spectra compatible time history with multiple damping. By simultaneously matching several spectral curves for different dampings, the conservatism in design based on a single damping spectrum‐enveloping accelerogram, especially for low damping values, may be substantially reduced. (3) Development of a minimum requirement for the power spectral density function, which is a secondary requirement to prevent the design ground motion from encountering severe power deficiency. |
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| Keywords: | ground motion characteristics design spectrum earthquake engineering |
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