Abstract
A method is proposed to estimate the seismic soil-structure-interaction (SSI) effects for use in engineering practice. It is applicable to 2D structures subjected to vertically incident shear waves supported by homogenous half-spaces. The method is attractive since it keeps the simplicity of the spectral approach, overcomes some of the difficulties and inaccuracies of existing classical techniques and yet it considers a physically consistent excitation. This level of simplicity is achieved through a response spectra modification factor that can be applied to the free-field 5%-damped response spectra to yield design spectral ordinates that take into account the scattered motions introduced by the interaction effects. The modification factor is representative of the Transfer Function (TF) between the structural relative displacements and the free-field motion, which is described in terms of its maximum amplitude and associated frequency. Expressions to compute the modification factor by practicing engineers are proposed based upon a parametric study using 576 cases representative of actual structures. The method is tested in 10 cases spanning a wide range of common fundamental vibration periods.
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Supported by: “Investigaciones Geotecnicas Solingral S.A”, Departamento Administrativo de Ciencia, Tecnología e Innovación, COLCIENCIAS and from Universidad EAFIT through Research Grant No. 1216-403-20372
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Jaramillo, J.D., Gómez, J.D., Restrepo, D. et al. A novel simple procedure to consider seismic soil structure interaction effects in 2D models. Earthq. Eng. Eng. Vib. 13, 535–543 (2014). https://doi.org/10.1007/s11803-014-0260-y
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DOI: https://doi.org/10.1007/s11803-014-0260-y