Effect of fluid presence on the non-axisymmetric dynamic response of imperfectly bonded buried orthotropic pipelines due to incident shear wave

Abstract

This paper deals with the non-axisymmetric dynamic response of an imperfectly bonded buried fluid-filled orthotropic pipeline excited by shear waves travelling in the surrounding infinite medium. A thick shell model has been taken which includes the effect of shear deformation and rotary inertia. For the wave propagation in the fluid inside the pipe, the linear acoustic equation has been used. The effects of bond imperfection on the shell response have been compared with the effects realized due to the presence of fluid inside the pipeline. The results have been obtained at various angles of wave incidence and for different soil conditions. The effects of changes in the fluid density are also discussed. Although the formulation has been presented for SV- and SH-wave excitations, numerical results are given for the case of incident SH-wave only. It is found that under certain conditions, the consideration of fluid inside the pipeline may lead to even higher value of shell deformation than that observed due to the imperfect bond. © 1993.