Dynamic response of buried orthotropic cylindrical shells to an inclined axisymmetric moving load

The aim is to study the effect of orthotropy on the steady-state dynamic response of a buried pipeline subjected to a radial and/or tangential load moving along the axis of the pipe. For this purpose only axisymmetric response has been studied. In the formulation of the problem the pipeline has been modelled as an infinitely long orthotropic circular cylindrical shell buried in an infinite medium. A perfect bond between the shell and the surrounding medium has been assumed and thin shell theory formulation has been employed. Results have been obtained for hard (rocky), medium hard and very soft soil conditions surrounding the shell. Effects of shell orthotropy have been determined by varying the non-dimensional orthotropy parameters over a wide range. It is observed that the introduction of orthotropy reduces the amplitude of axial and radial displacements.