National Natural Science Foundation of China (Contractno.11472309),the State Key Laboratory of Robotics (Contractno.2013-O15),the Fundamental Research Funds for the Central Universities (Contract no. 14CX02208A) and Key Research Projects of Shandong Province (Contract no. 2015GSF115024).
Jack-up platforms will generally behave as highly dynamic systems because of the structure flexibility. The environmental forces acting on these jack-ups will therefore induce significant dynamic response. In this paper, based on ANSYS, the three-dimensional model of a truss leg jack-up was built. With interaction of fluid–structure–soil being considered, a series of static analysis, modal analysis, and transient analysis were performed for the model with different dimensional or load parameters; and the dynamic magnification factors were calculated. Sensitivity of these parameters on the dynamic response of jack-ups were discussed in detail.