根据国内外调研资料,归纳整理海上LNG(液化天然气)接收站重力式基础结构(GBS,gravity based structure)的概况、结构设计方法及难点解决方案,并提出海上重力式基础结构LNG接收站在国内的应用展望和亟待解决的问题.亚得里亚海LNG接收站的结构设计为GBS的典型结构,基于半概率极限状态设计法,采用有限元方法分析获得从建造到应用的各阶段结构受力状态.结构设计的主要难点包括LNG储罐要求的混凝土温度梯度控制、绝缘材料湿度梯度控制,以及结构整体的抗震可靠性.通过预埋发热电缆和安装柔性钢衬垫隔绝水汽,可以解决温度和梯度的变化,通过有限元分析地震作用下的地基-结构相互作用,以论证结构抗震试验.由于资料有限,需要对GBS的详细设计及施工等开展进一步研究,其在我国未来的能源进口、海上天然气开采等方面具备应用潜力.
Design method and application of LNG receiving station for offshore gravity based structure
Based on domestic and foreign research data,this paper summarizes and organizes the overview,structural design methods,and difficult solutions of gravity based structure(GBS)for offshore LNG(liquefied natural gas)receiving station.It also proposes the application prospects and unresolved problems of offshore GBS LNG receiving station in China.The structural design of the Adriatic Sea LNG receiving station is a typical structure of GBS,based on the semi-probabilistic limit state design approach.The finite element method is used to analyze and obtain the stress state of the structure at each stage from construction to application.The main difficulties in structural design include the temperature gradient control of concrete required for LNG tanks,the humidity gradient control of insulation materials,and the overall seismic reliability of the structure.The temperature and gradient changes are solved by embedding heating cables and installing flexible steel pads to isolate water moisture.The seismic resistance test of the structure is demonstrated through finite element analysis of the foundation structure interaction under seismic action.Due to limited information,further research is needed on the detailed design and construction of GBS,which has potential applications in future energy imports,and offshore natural gas extraction in China.
gravity based structureLNGdesign methodload combination
NETL
NSTL
万方数据
