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结合大连新港新建30万吨级(兼靠45万吨)进口原油码头工程,研究离岸深水港码头轻型导管架结构在系泊船舶撞击下的疲劳损伤。采用通用有限元程序ANSYS计算船舶撞击作用下导管架平台的动力反应,得到结构构件的名义应力,乘以相应的应力集中系数,得到管节点热点应力的时程曲线。分别应用美国石油学会(API)规范、挪威船级社(DNV)规范和中国船级社(ZC)规范中相应的S-N曲线对船舶撞击作用下的疲劳损伤进行了计算。计算结果表明,对应用于离岸深水港码头的导管架结构,由船舶撞击平台所引起的疲劳损伤较大,不能忽略,若只考虑波浪荷载引起的疲劳损伤会导致过高地估计结构的疲劳寿命。结果还表明,按API规范与ZC规范计算得到的疲劳损伤基本一致,按DNV规范计算得到的疲劳损伤较其他两种规范偏大。
Combined with the construction of a new 300,000-ton crude oil terminal (relying on 450,000 tons) in Xingang, Dalian, the fatigue damage of light jacket structure of offshore deep-water port wharf under the impact of mooring ship was studied. The common finite element program ANSYS is used to calculate the dynamic response of the jacket platform under the impact of ship. The nominal stress of the structural members is obtained and multiplied by the corresponding stress concentration factor to obtain the time history curve of the hot spot stress of the pipe joints. The fatigue damage under impact of ship was calculated by applying the corresponding S-N curves in the American Petroleum Institute (API), Det Norske Veritas (DNV) and China Classification Society (ZC) codes respectively. The calculation results show that the fatigue damage caused by the impact platform of the ship is large and can not be ignored for the jacket structure applied to the offshore deep-water port wharf. If only the fatigue damage caused by the wave load is considered, the fatigue life of the structure will be overestimated . The results also show that, according to the API code and the ZC code, the calculated fatigue damage is basically the same. The fatigue damage calculated by the DNV code is larger than the other two specifications.