Meta model-based optimization of jacket offshore platform for resilient marine infrastructures

Marine infrastructure is an established sector in the blue economy of Indonesia and is expected to shift from a project to a product-based approach. At the same time, the development of the blue economy depends on the economic value that needs to cut down the construction cost for marine infrastructure. To realize this development plan, a structural design optimization framework must be initiated to design a more resilient and high-economy value infrastructure. Marine infrastructures in Indonesia are dominated by jacket-type structures suitable for shallow water. A study of design optimization for jacket-type offshore structures is conducted in this paper. The structure is designed for the Indonesia Sea, located in North Gresik. The optimization is conducted with the structure limit state as the constraint as a meta-model. Variables are the dimensions of structural main members, consisting of the tubular member radius and thickness. The highest optimization ratio is achieved for the wall thickness variable. The cost objective and computational effort reduction prove the feasibility of the proposed design optimization method.