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dominant pulse simulation of near fault ground motions

Earthquake Engineering and Engineering Vibration 2013年第2期12卷 267-278页

作者： S.R. Hoseini Vaez M.K. Sharbatdar G. Ghodrati Amiri H. Naderpour A. Kheyroddin Department of Civil Engineering Faculty of EngineeringUniversity of Qom Faculty of Civil Engineering Semnan University Center of Excellence for Fundamental Studies in Structural Engineering School of Civil EngineeringIran University of Science and Technology

In this study, a new mathematical model is developed composed of two parts, including harmonic and polynomial expressions for simulating the dominant velocity pulse of near fault ground motions. Based on a proposed velocity function, the corresponding expressions for the ground acceleration and displacement time histories are also derived. The proposed model is then fitted using some selected pulse-like near fault ground motions in the Next Generation Attenuation （NGA） project library. The new model is not only simple in form but also simulates the long-period portion of actual velocity near fault records with a high level of precision. It is shown that the proposed model-based elastic response spectra are compatible with the near fault records in the neighborhood of the prevailing frequency of the pulse. The results indicate that the proposed model adequately simulates the components of the time histories. Finally, the energy of the proposed pulse was compared with the energy of the actual record to confirm the compatibility.

关键词： dominant pulse near fault ground motions forward directivity response spectra simulation

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