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Conversion factors for design spectral accelerations including soil–structure interaction

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Abstract

In this paper maximum response of a single degree of freedom system resting on a flexible base is determined under consistent earthquakes and the results are presented as acceleration spectra including soil–structure interaction (SSI). Flexibility of base is modeled using frequency-dependent springs and dampers. The spring–damper coefficients are calculated for the desired natural mode of vibration of a multi-degree-of-freedom system. 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. Ratio of spectral acceleration modification factors with SSI from this study to those calculated using the ASCE 7-10 procedure are determined for each case. Examination of the resulting curves shows that the mentioned code is conservative/non-conservative in estimation of spectral responses with SSI in certain cases for the lower/higher modes of vibration. The code’s procedure is modified using the developed curves for a conversion factor.

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Authors and Affiliations

  1. Department of Civil Engineering, Isfahan University of Technology, Esfahan, 8415683111, Iran

    Farhad Behnamfar

  2. Esfahan, Iran

    Ali Fathollahi

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  1. Farhad Behnamfar
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  2. Ali Fathollahi
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Correspondence to Farhad Behnamfar.

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Behnamfar, F., Fathollahi, A. Conversion factors for design spectral accelerations including soil–structure interaction. Bull Earthquake Eng 14, 2731–2755 (2016). https://doi.org/10.1007/s10518-016-9926-3

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  • DOI: https://doi.org/10.1007/s10518-016-9926-3

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