自升式深海网箱不同工况下结构安全性评估研究  

Research on Structural Safety Evaluation of Jack-up Offshore Net Cage under Different Conditions

作　　者：庞国良 黄小华[1] 陈超核[2] 袁太平 胡昱[1] 王绍敏[1] 孙长文 PANG Guoliang;HUANG Xiaohua;CHEN Chaohe;YUAN Taiping;HU Yu;WANG Shaomin;SUN Changwen(South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Laboratory of Open-Sea Fishery Development,Ministry of Agriculture and Rural Affairs,Guangdong Cage Engineering Research Center,Guangzhou,Guangdong 510300,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,Guangdong 510600,China;Zhuhai Agricultural Investment Holding Marine Industry Development Co.,Ltd,Zhuhai,Guangdong 519000,China)

机构地区：[1]中国水产科学研究院南海水产研究所,农业农村部外海渔业开发重点实验室,广东省网箱工程技术研究中心,广东广州510300 [2]华南理工大学土木与交通学院,广东广州510600 [3]珠海市农控海洋产业发展有限公司,广东珠海519000

出　　处：《渔业科学进展》2022年第6期56-68,共13页Progress in Fishery Sciences

基　　金：国家重点研发计划(2019YFD0900903);国家自然科学基金(32173024,31772897);农业农村部外海渔业开发重点实验室开放基金(LOF2021-04);海南省科技计划三亚崖州湾科技城联合项目(520LH039);中国水产科学研究院中央级公益性科研院所基本科研业务费专项资金(2020TD77)和中国水产科学研究院南海水产研究所中央级公益性科研院所基本科研业务费专项资金(2021SD10,2021TS04)共同资助。

摘　　要：深海网箱养殖受极端环境影响较大,自升式深海网箱凭借其结构特点在极端天气下可将养殖箱体下潜入水,为更好地应对极端环境、增加养殖效益提供了可能。本文针对某自升式深海网箱,基于大型通用有限元软件ANSYS的Mechanical模块,建立其有限元分析模型,而后考虑正常作业及风暴自存2种作业状态,通过编制不同相位角下桩腿支反力搜索程序确定计算工况,最终求解得到网箱各部件结构变形情况及应力分布,从而完成网箱结构安全性评估。研究表明,自升式深海网箱通过箱体下潜入水可以很好应对极端环境条件;经校核,本研究的自升式深海网箱结构安全性满足要求;桩腿及附近撑杆是自升式网箱的结构薄弱区域,在网箱设计中应予重点考虑。本研究可为自升式深海网箱结构安全分析提供方法参考。To further exploit offshore fishery resources while avoiding coastal pollution issues,offshore net cages are gradually moved towards the deep sea. However, the deep ocean environment is very complex and harsh, which severely threatens the safety of offshore net cage structures.Therefore, developing a deep-water net cage with a strong ability to resist high waves and maintain structural safety is essential. Based on the structural characteristics of the jack-up platform that allows the main body to move up and down along the platform legs, a new offshore net cage has been presented. When extreme weather occurs, the net cage body can quickly submerge along the legs,providing a solution for open-sea aquaculture to resist extreme loading. Research on jack-up platforms is mainly in traditional ocean oil and gas platforms and offshore wind turbine installation facilities. It can provide helpful suggestions for this research. The jack-up net cage developed in this study is composed of the leading steel frame and eight pile legs. The bottom of the pile leg was inserted into the seabed to fix the entire net cage. The cage frame could move up and down along the eight pile legs to meet the requirements of cage operation, survival, and towing conditions. The material of the cage was Q345 steel with a yield strength of 345 MPa. In this study, the safety factor was 1.5, and the allowable stress was 230 MPa. To analyze the structural safety of the jack-up net cage under operating conditions and survival conditions, numerical models of the net cage were first created using the general finite element software ANSYS Mechanical according to the geometric and material parameters of the net cage. The element Pipe59 was used to simulate all pipe structures,including the legs and cage frame. The pile leg sleeves were simulated using Solid45.In addition, node coupling technology was used to simulate the relationship between the legs and leg sleeves. The primary environmental parameters under operating and survival conditions are known b

关 键 词：深海网箱 自升式 结构安全性 强度分析 

分 类 号：S953[农业科学—水产养殖]