Equivalent-Linear Seismic Response of Bridge Approach Embankments

J.C. Carvajal

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: FUNDAMENTALS - X Physical & Numerical Modelling

ABSTRACT: A single degree of freedom system model, called 1ME, is presented in this paper for calculating the seismic response of approach embankments in the far field. The model is developed using shear wave propagation theory, the Galerkin method and the fundamental mode of vibration of a uniform embankment. The non-linear response of the embankment is approximated with an equivalent-linear analysis using conventional shear modulus reduction and damping ratio curves. A simple expression for the effective cyclic shear strain of the embankment is developed for determination of the equivalent-linear shear modulus and damping ratio. A step-by-step procedure is presented for calculating the equivalent-linear properties and the seismic response of the embankment using an input earthquake record or a target response spectrum. Verification of the proposed model is carried out with finite element dynamic analysis. Accurate results are obtained with the 1ME model for calculating the far-field embankment response.

RÉSUMÉ: Un system avec un seul degré de liberté, nommé model 1ME, est présenté dans cette publication pour calculer la réponse uniformes. La réponse non-de cisaillement et les courbes de efforts de cisaillement dans le corps des remblais est développée pour la détermination du module équivalent linéaire de ement. Une procédure étape par étape est développée pour calculer les propriétés spectre de réponse. La vérification du modèle proposé remblais.

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