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As a major offshore oil and gas development facilities , offshore platforms play a decisive role . As the marine environment is very harsh , environmental wind , waves, ocean currents , earthquakes and other dynamic loads and environmental effects will affect the safety of offshore platforms . Bohai Bay region has a temperate monsoon climate , winter icing , and our country is at the intersection of two of the world seismic zone seismic activity zone , as a random process huge ice load and seismic effects on marine platform is causing huge security threat. Using static method on the marine platform analysis and design, can not fully consider the role of platforms in the power amplification under unfavorable response , there are some flaws , our multiple platforms in the ice under the action of impact or earthquake damage . Based on Bohai Bay shallow offshore platforms in the dynamic environment loads the dynamic response analysis , establish a rational finite element model of offshore platforms , according to China's Bohai Bay, offshore platforms and related documents and environmental conditions , select the appropriate load calculation theory, offshore platforms in a variety of load conditions the force ; using the finite element software simulation offshore platform structures , offshore platforms through APDL language analysis dynamic response under various conditions to find out the most unfavorable load case combinations ; through ANSYS optimization module and reliability analysis module reliability analysis for offshore platforms and to optimize the design of the structure and optimization methods .
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