Mechanics Analysis To The Offshore Jacket Platform Under Tsunami Loading

The energy on the land increasingly dried up in recent years, ocean petroleum resourcesgradually become the focus of world attention, Offshore platform as an important equipmentof offshore oil industry which including oil production, processing, storage, transportation andpersonnel work, life and so on many functions in one, has an irreplaceable role. Due tooffshore Marine environment is extremely complex, daily subjected to wave load, wind loadand seawater corrosion, and probably devastating damage and oil leakage, explosion andother secondary disasters happened after the surprise attack of tsunami. The force analysis ofmarine platform under the wave load become one of the important subjects about platformsecurity. Based on shallow water jacket offshore platform as the research object, carry on thefollowing work:1.the comprehensive narration about the current research status of tsunami and offshoreplatform at home and abroad. Introduced the tsunami generation, transmission, climbingmechanism and previous research results, analysis the types and performance of the offshoreplatform.2.establish and analysis the jacket offshore platform model, providing reliable basis forthe subsequent calculation. using the added mass dynamic theory, water damping theory andpile soil interaction theory, calculate the function of sea water on the platform when the static,and use ADINA software to establish finite element model of jacket offshore platform,research vibration mode and frequency of sea platform when coupled with the sea water andcompared with uncoupled conditions.3.simulating the earthquake and tsunami generation, transmission and climbing based onpotential flow theory. Based on the theory of fluid potential, earthquake tsunamitwo-dimensional finite element model is established, observing tsunami generation, spread tothe tsunami in the process of climbing a vertical parameters such as wave height, accelerationand speed, and carries on the analysis of the scale and extent of damage from the fivedifferent vantage point which is the focal point,125km from the source,250km away fromthe source, land and sea border and land on shore.4.stress analysis of the jacket offshore platform under the wave loads is carried out apply.Tsunami loading theory and the traditional wave theory respectively calculate the tsunamiload and applying on the platform, carries on the stress analysis to illustrate the rationality ofthe two theories. Calculate the tsunami loading at different wave height, analysis themechanical characteristics of the platform, put forward the design ideas when jacket offshoreplatform resisting the attack from small tsunami.