Seismodynamics of a pipeline laid on supports taking into account the interaction of the foundation with the soil

This article examines the stress-strain state of a pipeline passing through a ravine, supported by two supports with foundations in the ravine and subject to gravitational forces (its own weight and the weight of the transported gas), operating parameters (product pressure and temperature) and seismic loads. The seismic load is specified as a three-component Manjil seismogram (Iran, 1990). The finite element method and the finite difference time method are used to solve the problem. Successive approximation iteration is used to solve the nonlinear problem. Two cases of fixing (hinged and rigid) between the supports and the pipeline are considered. The effect of deformation of the supports with the foundation on the seismodynamics of the pipeline is demonstrated. It was found that the geometric dimensions of the supports and foundations, as well as the influence of different values of the interaction between foundations and soil significantly affect the pattern of transverse displacements (in horizontal and vertical directions) and stresses over time in different sections of the pipeline under the influence of seismic load.