桁架式Spar平台方案设计研究

Study on the design approach for Spar platforms

Spar平台是一种用于深海油气开发的海洋结构物。目前对Spar平台的研究集中在其运动特性和水动力分析、结构强度和疲劳研究以及垂荡板的性能和设计上。然而,国内对于Spar平台设计方法的研究却很少,国内外公开发表的文献也很少,这给Spar平台的设计带来了困难。本文归纳了桁架式Spar平台方案设计的基本流程,包括总布置、主尺度的选择,以及对设计方案进行的稳性校核和水动力分析。在此基础上,针对平台的不同结构推荐使用相应的ABS和API规范进行结构设计,并应用设计波法对得到的结构尺寸进行强度校核。通过一个实例详细说明了整个设计过程,分析结果表明该设计方案是可行的。同时指出了传统的海洋工程设计方法存在的问题,提出在传统设计方法的基础上,应用多学科设计优化思想进行海洋平台的方案设计的基本思想。

As the offshore industry moves towards deep and ultra-deep water frontiers for new oil ＆amp; gas discovery and production,the Spar platform has become one of the most attractive development concepts.Various technical papers have been published on Spar motions,hydrodynamics,structural and fatigue analysis,vortex induced vibration and etc.However,very few papers exist in the literature related to the conceptual design method of the Spars.This paper elaborates the interactive design process of Truss Spar,which includes many stages such as general arrangement, hull dimensions, stability and hydrodynamics. In addition, specific classification rules for different parts of the platform are recommended as criteria of structure scantlings. Design regular waves methodology is proposed and applied for strength analysis and code checking. To better illustrate the whole process,a Truss Spar design example is given. Finally,some inherent shortcomings of the traditional design are pointed out and multidisciplinary design optimization （MDO） is further recommended to be brought into the design of offshore platforms.