In this paper, an interface 3D-beam element is presented for the linear dynamic analysis of buried, or pile, structures under a seismic ground motion represented by R-waves propagation. The formulation of the element is based on the assumption that the ground is a viscoelastic continuum, which can be represented by a two parameters soil model of the Winkler and the shear type )Pasternak model). In the formulation, the effects of shear deformation and a constant axial force of the beam are taken into account. The stiffness matrix and the load vector of the interface element are stated in the complex domain as depending on the frequency and damping properties of the soil. It is stated that the load vector is a function of the ground deformation. An example of a pipeline is presented for demonstration purposes.
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