Dynamic Analysis And Optimization Of Offshore Platform In Bohai Bay

As an important offshore oil and gas field development facilities, offshore platforms play a decisive role. As the marine environment is very bad, the wind, waves, ocean currents, earthquakes and other environment dynamic loads and effect will affect the safety of offshore platforms. Bohai Bay is located in temperate climates regions with winter icing phenomena, and China is among the world's two major seismic zones, therefore, the great ice loads with random and seismic effects bring a tremendous threat to the security of marine platforms. The design of offshore platforms is analyzed by static method, the adverse effect of the power amplification response can not be adequately taken into account, multiple platforms were damaged under the action of ice or earthquake impact. The main contents of the thesis are as follows: Establish a rational finite element model of offshore platform,then select the appropriate load calculation theory according to relevant regulations of offshore platform and the environmental conditions in Bohai Bay to analyze the forces of offshore platforms in a variety of load conditions. Use the ANSYS FEM software, simulate the submerged tube legs by PIPE59 element, and find out the most unfavorable combination of load cases through analysis of the dynamic response in a variety of load conditions by the language of APDL. Use the programmed language to optimize the structure design and analyze comparatively on the reliability of the offshore platforms before and after the optimization by optimization module and reliability analysis module of the ANSYS, and the results meet the requirements of the corresponding norms.