Response of an imperfectly bonded buried fluid-filled orthotropic cylindrical shell due to an incident shear wave

Abstract

This paper deals with the axisymmetric dynamic response of an imperfectly bonded fluid-filled orthotropic pipeline excited by a plane shear wave. The pipeline has been modelled as infinitely long, thick cylindrical shell. Effects of imperfect bond between the shell/pipe and surrounding soil have been included by considering a layer of an infinitesimally small thickness between the pipe and the soil. This layer possesses stiffness and the damping properties against any axial or radial movement. The linear acoustic equation has been used for wave propagation in the fluid inside the pipe. It is found that under certain conditions effect of the presence of fluid can become comparable to the effect of variation in bond parameters between the shell and surrounding soil. Also, it has been found that the presence of fluid inside the pipeline alters the radial displacements of the shell more than the axial displacement. In general, however, fluid effect is not found to be that important as the consideration of bond imperfection of the shell. © 1991.