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Simulation method of near-fault pulse-type ground motion

Acta Seismologica Sinica(English Edition) 2007年第1期20卷 80-87页

作者：田玉基杨庆山卢明奇 School of Civil Engineering and Architecture Beijing Jiaotong University Beijing 100044 China

The two characteristics of near-fault ground motions, i.e., the forward directivity effect and permanent displacement effect, result in long period and large velocity pulse in the velocity time history and large step pulse in the displacement time history. Considering the two effects, a simple expression of continuous function for equivalent velocity pulse time history is presented in this paper. The equivalent pulse model, in which the pulse period, peak velocity and pulse shape are described by five parameters, is highly advantageous to fit and simulate the pulse-type velocity time history. The equivalent pulse model comprises only one low-frequency component while the high-frequency component of a pulse-type earthquake record cannot be considered. Based on 28 records of 11 earthquakes, the pulse frequency of pulse-type records is generally less than 1 Hz. Therefore the low-frequency component and high-frequency component are simulated respectively and combined them together to generate a pulse-type ground motion.

关键词： pulse-type ground motion equivalent velocity pulse low-frequency component high-frequency component

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An alternative construction of normalized seismic design spectra for near-fault regions

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Earthquake Engineering and Engineering Vibration 2013年第3期12卷 351-362页

作者： Ni Shunhao Li Shuang Chang Zhiwang Xie Lili School of Civil Engineering Harbin Institute of Technology Department of Civil and Environmental Engineering University of Waterloo Institute of Engineering Mechanics China Earthquake Administration

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.

关键词： near-fault pulse-type ground motion equivalent pulse model attenuation relation seismic design spectra

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