Abstract
The structural behaviour of submarine natural gas transmission pipelines is simulated with the aid of a finite difference numerical model. A conditional point Jacobi relaxation method is adopted for the simultaneous identification of the pipe deformation and the unknown contact points along the initially assumed rigid seabed profile. A method using the linear spring concept is proposed for examining the subsequent vertical soil displacements. The pipe gradients and the tensile forces developed due to pressurization are the main sources of non-linearity considered in the fundamental equation of flexure. Maximum probable hydro-dynamic lift forces are taken into account during the empty pipeline phase analysis. A wide range of loading schemes is investigated in order to ascertain that the bending stresses remain within the acceptable range for the pipe material. Due to a high probability of soil liquefaction occurrence during earthquakes, a stress analysis is carried out using a suitably altered seabed profile in order to identify the points of critical bending.
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