The Influence Study Of Spudcan Model In The Dynamic Response Analysis Of Jack-up

The jack-up platform in deep sea need to consider the dynamic effect which environment factor for example wave bring, the sea soil has an important role in jack-up dynamic analysis.in this paper, spudcan-soil model, pinned model, fixed model and API model are established and used in jack-up dynamic FEM model. In this paper, four models dynamic responses such as the vibration frequency, mode of vibration and the hull displacement are get by modal analysis and transient analysis in ANSYS. The spudcan-soil model can be prove reasonable and efficacious through the comparison of calculated results. In this paper, the dynamic amplification factor(DAF) of platform in different wave periods be calculated by single-degree of freedom(SDOF) and time-domain analyzing method, and the difference of DAF between two methods be compared and analyzed.There are some important parameters in supdcan-soil model such as the diameter of pile shoe, undrained shear strength and range of soil, what will influence the vibration frequency, mode of vibration and the hull displacement gained by dynamic analysis, be researched in detail in this paper. According to the rule that the change of dynamic responses with these parameters, some suggestion are provided in this paper.Based on spudcan-soil model, geometrically nonlinear(P-?effect) of platform structure is researched in dynamic response analysis of platform. It is proved that the P-?effect has an important role for vibration frequency, mode of vibration and the hull displacement and P-? effect should be considered in the dynamic FEM model of jack-up platform.