IJE TRANSACTIONS C: Aspects Vol. 30, No. 9 (August 2017) 1300-1307    Article in Press

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F. Behnamfar and Ali Fathollahi
( Received: January 11, 2017 – Accepted: July 07, 2017 )

Abstract    Design spectrum is known as an essential tool in earthquake engineering for calculation of maximum (design) responses in a structural system. Soil-structure interaction, as a phenomenon of coupling of responses of a structure and its underlying soil, was explored after introduction of design spectra and have not been taken into account in developing a design spectrum traditionally. To consider the soil-structure interaction automatically when doing a spectrum analysis, in this paper maximum response of a single degree of freedom system resting on a flexible base is determined under consistent earthquakes. Consistency of earthquakes is maintained considering their magnitude, distance, local soil type, and return period. The latter parameter is accounted for by the use of earthquake categories identified by their similar spectral values at short periods. Different types of soils and two categories of earthquakes regarding their distance, being near field and far field, are considered. The results are presented as smoothed design spectra.


Keywords    design spectrum, soil-structure interaction, earthquake record, dynamic analysis.



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