Finite Element Analysis and Stress Monitoring Point Selection in High Stress Areas of Offshore Jack-up Platforms
Jack-up platform is an important facility for offshore oil and gas exploration and development,but its key structures are subject to the influence of alternating loads such as wind,wave and current for a long time,which is easy to produce alternating stress and cause fatigue damage.Therefore,it is necessary to monitor the stress of the key structures of the jack-up platform.By using finite element software,the stress distribution of the pile legs and the main parts of the jack-up offshore platform is analyzed to determine the high stress areas of the pile legs,upper and lower ring beam,enclosure area,riser frame and seawater pump frame structure.The suitable stress sensors and their installation positions are selected.The results show that the pile pin connection point of the pile leg structure of the jack-up platform,the connection point between the lifting device and the deck in the upper and lower ring beam area,and the lower deck area in the enclosure area,the connection point between the water casing and the deck and the connection point between the seawater pump frame and the deck are selected as the monitoring points of high stress areas,which helps to accurately diagnose the status of the platform and give early warning in time to eliminate safety hazards.
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