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With the introduction of the design variables of nodal coordinates,which reflect the em-bedded depth of the pile and the jacket bed height,a shape optimum design model for offshore jacket plat-forms is established.A sequential two-level optimum algorithm is developed based on the design variablegradation.On the basis of the finite element method,the sensitivity of the objective function and nodal dis-placement is analyzed.As an example,the BZ281 oil storage offshore platform,which lies in the Bohai oilfield,is designed with the shape optimum model.The results are compared with the cross-section optimumdesign.The tendency of design variables and its reasons in the two methods are analyzed.In the shapeoptimum design,the value of objective function is obviously smaller than that of the initial design and thecross-section optimum design.Therefore,the advantage of structure shape optimum design for jacket plat-forms is remarkable.
With the introduction of the design variables of nodal coordinates, which reflect the em-bedded depth of the pile and the jacket bed height, a shape optimum design model for offshore jacket plat-forms is established. A sequential two-level optimum algorithm is developed based on the design variable degradation. On the basis of the finite element method, the sensitivity of the objective function and nodal dis-placement is analyzed. As a example, the BZ281 oil storage offshore platform, which lies in the Bohai oilfield, is designed with the shape optimum model.The results are compared with the cross-section optimumdesign.The tendency of design variables and its reasons in the two methods are analyzed. the shapeoptimum design, the value of objective function is obviously smaller than that of the initial design and thecross-section optimum design.Therefore, the advantage of structure shape optimum design for jacket plat-forms is remarkable.