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An alternative construction of normalized seismic design spectra for near-fault regions |
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| Authors: | Shunhao Ni Shuang Li Zhiwang Chang Lili Xie |
| Institution: | 1. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China 2. Department of Civil and Environmental Engineering, University of Waterloo, N2L 3G1, Waterloo, Canada 3. Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China |
| Abstract: | This paper presents a methodology for constructing seismic design spectra in near-fault regions. By analyzing the characteristics of near-fault pulse-type ground motions, an equivalent pulse model is proposed, which can well represent the characteristics of the near-fault forward-directivity and fling-step pulse-type ground motions. The normalized horizontal seismic design spectra for near-fault regions are presented using recorded near-fault pulse-type ground motions and equivalent pulse-type ground motions, which are derived based on the equivalent pulse model coupled with ground motion parameter attenuation relations. The normalized vertical seismic design spectra for near-fault regions are obtained by scaling the corresponding horizontal spectra with the vertical-to-horizontal acceleration spectral ratios of near-fault pulse-type ground motions. The proposed seismic design spectra appear to have relatively small dispersion in a statistical sense. The seismic design spectra for both horizontal and vertical directions can provide alternative spectral shapes for seismic design codes. |
| Keywords: | near-fault pulse-type ground motion equivalent pulse model attenuation relation seismic design spectra |
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