OFFSHORE STRUCTURAL DYNAMIC ANALYSIS CONSIDERING SOIL-STRUCTURE INTERACTION BY A COUPLED BEM AND MESHFREE METHOD

摘要

An investigation of dynamic offshore structure considering soil-structure interaction by a coupled approach based on boundary element and meshfree methods is presented. The moving Kriging interpolation is used for generating the shape functions because of possessing the Kronecker delta property, which makes easier in imposing the essential boundary conditions. The governing elastodynamic equations are transformed into a standard weak formulation. It is then discretized into a meshfree system of time-dependent equations, which are solved by the standard implicit Newmark time integration scheme. Numerical examples illustrating the applicability and effectiveness of the proposed method are presented and discussed in details. A two dimensional plane strain offshore-foundation model has been used for the time history analysis to compute the stresses and displacements against earthquake and wave loading considering the effect of soil-structure interaction. As a consequence, it is found that the method is very efficient and accurate for dynamic analysis compared with those of other conventional methods.