Research On Dynamical Responses Of Ice-structure Of The Bucket Foundation Platform

The bucket foundation consists mainly of a cylinder structure with a watertight top plate and an opened bottom. The foundation could be penetrated into sea bottom when pumping water out from the foundation chamber. The principle of the suction installation has been accepted in engineering and spread in applications in offshore tanker moorings and also as foundation of platforms (suction foundation so called the bucket foundation platforms) in the last two decades.In this paper, the theory of reciprocity between ice and structure, the mechanism of suction foundation under the horizontal load and non-linear finite element are studied. The main works done are as follows:Under the same conditions on load and constraint, using 3D 8-node element and selecting different soil boundary, three-dimensional finite element analysis of subsidiary stress dispersion behavior of bucket edge soil is carried out. General purpose finite element program ANSYS is adopted in the analysis. It is shown that the rule of subsidiary stress dispersion of bucket edge soil has directivity; boundary effect of soil can be ignored when the boundary size of soil is determined, as long as taking quintuplicate diameter of bucket for the size of soil boundary at horizontal direction and taking twofold height of bucket for the size of soil boundary at vertical direction, and an rational balance point between computation accuracy and solution time of finite element can be found.The non-linear of soil can be simulated by boundary element. By choosing the propriety parameter, the dynamical action between structure and soil is studied. The flexure wreck of ice is used to study acceleration of column top and bottom under different velocity. By comparing, the velocity of load is greatly connected with dynamical action between ice and structure.