Abstract: With the improvement of the comprehensive ability of oilfield design,construction and installation,the forms and member specifications of main structures such as main legs,diagonal braces and frame beams of offshore platforms in Bohai Bay tend to be serialized and standardized. The conventional offshore platform structure is a forward design carried out after the determination of oil reservoir,process flow,general layout and weight control. If one of the links changes,it is necessary to recalculate,check and even redesign the structure,resulting in repeated work and even an increase in the construction period. The standardized design of the main structure of the platform is to design a series of offshore platform main structure drawing library suitable for different process flows and equipment layouts by studying typical process flows and overall area layout. It can be used together with serialized jackets suitable for different areas of the Bohai Sea,which can cover most of the Bohai Bay area and realize the reuse of the main structure design of offshore platform.

Key words: Bohai Bay, topsides, main structure, standardized design