Generally, jack-up stmcture is utilized to explore and produce oil in shallow water. The benefits of combination mobility and the behavior as fixed structure in operational condition, in addition to economical aspect have made this type of offshore platform more important in offshore industry and increase demand of offshore industry to use it in deeper water and harsher environment. By increasing depth, the dynamic effect become important and sensitivity to soil-structure model increases. In this paper four model of pined, fixed, linear elastic and nonlinear soil-structure interaction have been investigated. The results show large difference depending upon the support conditions. The choice of soil-structure interface significantly affects on Gaussianity of the response.
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