共查询到17条相似文献，搜索用时 437 毫秒
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应用ANSYS软件建立了平台和冰相互作用的有限元模型,构建了自升式平台的冰激振动模型,并计算基于2种冰力模型的自升式平台的动力响应。此动力分析方法具有建模方便和计算精度高的特点。以某自升式平台为例,计算了冰和平台结构相互作用的耦合效应,为自升式平台冰激振动安全评估提供了参考依据。 相似文献
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冰激直立腿海洋平台疲劳寿命分析 总被引：1，自引：1，他引：0
由于渤海特殊环境条件与油藏分布决定了该海域导管架油气平台属于典型的柔性抗冰结构。多年现场观测发现,该类结构存在显著的冰激振动现象。冰振不仅能激起较大的甲板加速度响应,还会引起明显的导管架管节点交变应力。在结构设计与安全保障中进行疲劳分析及寿命估计是必要的。对于直立腿抗冰结构,精确的冰激疲劳寿命计算方法还不成熟。基于多年的现场监测,首先分析了冰与直立腿抗冰结构相互作用过程;其次,提出了冰激直立腿平台的疲劳寿命分析流程;最后,选取渤海某典型直立腿平台,利用ANSYS数值模拟,对比了稳态冰力和随机冰力下结构的疲劳损伤,进而计算出疲劳寿命。本研究为寒区柔性结构抗冰设计与安全保障提供了理论基础。 相似文献
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自升式平台拖航工况桩腿设计标准研究 总被引：1，自引：0，他引：1
本文对自升式钻井平台拖航工况桩腿的外力、内力和应力设计标准进行了综合分析。分别按照美国船检局、英国劳氏船级社、挪威船级社和我国船检局的近海移动式钻井平台入级和建造规范对我国建造的自升式平台桩腿结构进行分析计算。将所得的结果列表并绘出曲线,进行了综合分析。其结论为应用近海移动式钻井平台入级与建造规范和对这种自升式平台设计提供适当的依据. 相似文献
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自升式钻井平台在设计时通常不考虑冰荷载的作用,要实现冰区作业,首先需要对该类平台的抗冰能力进行准确评估。本文通过开展冰池试验,对自升式钻井平台冰载荷作用机理、结构冰激特性以及抗冰方法等进行研究。海洋结构受到的冰荷载大小以及结构响应值与冰厚密切相关,冰激振动机理与冰厚无关,探究不同冰速和冰厚下冰荷载及振动响应的时程曲线,可发现低冰速下结构展现出的准静态响应特征以及高冰速下的随机响应特征。冰激振动的发生是结构固有特性、冰速、冰厚、冰材料参数等因素共同影响的结果,其作用机理尤为复杂,本研究侧重于桁架式自升式平台冰区作业中结构冰激振动特性研究。 相似文献
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自升式平台穿刺过程结构响应研究 总被引：1，自引：0，他引：1
为减少自升式平台穿刺造成的损失,需要对自升式平台穿刺过程中的结构响应进行研究。根据某典型平台图纸,使用有限元法建立细化模型。在穿刺过程中采用CONNECTOR单元及非线性弹簧模拟自升式平台围阱区的齿轮齿条接触及桩土作用。考虑到模型中包含的高度非连续过程,穿刺过程采用显式动力学方法求解。通过分析模型穿刺后的结构形态,危险点分布,穿刺速度对结构的影响及预压载值的变化,探讨自升式平台穿刺过程中的结构响应特征。结果表明:平台导向板附近桩腿结构最容易在穿刺中损坏;穿刺速度对与桩靴相连的桩腿结构影响很大;为减少穿刺对结构的影响,可以考虑主动刺穿或减少气隙进行单桩预压载等措施。 相似文献
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本文对某自升式海上石油钻井平台的振动模态进行了计算和分析。平台长57.6米、宽34米,采用4根直径为3米的管形桩腿,腿高78米,工作水深40米,桩腿插入泥面以下约3米。本文提出了计算该平台振动模态的两种模型:空间薄壁结构模型和空间框架模型,用 SAP5结构分析程序进行了计算,获得了该平台的第一至第廿谐调的振动频率和模态,为我国自升式钻井平台动态特性的设计、分析和使用提供了有用的数据和可行的方法。文中对上述两种计算模型作了分析和比较,指出本文提出的空间薄壁结构模型是计算这类平台整体振动模态的一种简单易行而又经济的合理模型。此外,本文还指出了这类平台振动周期的跳跃现象,讨论了桩腿的支承条件对平台振动周期的影响以及平台结构的质量和附连水质量的处理等问题。 相似文献
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作用于平台桩腿的海冰屈曲破坏冰压力随机过程模型及其参数确定 总被引：2，自引：1，他引：2
冰对结构的作用过程是典型的随机过程。本文在冰压力过程为平稳过程的假设下，从渤海海冰对平台桩腿作用的大量实测冰压力数据中，选取了２１条冰屈曲破坏时的冰压力时程曲线，对它们进行谱分析后，得到了单点冰屈曲破坏的压力随机过程的谱密度，并确定了谱参数及其跟环境要素的关系，依据文献［１］中冰压力沿圆柱面的空间分布，建立了绕桩腿的冰压力随机场模型，并得到了作用于桩腿的总冰力随机过程及其谱密度。本文的研究成果为平台结构冰激随机振动和疲劳累积损伤分析提供了荷载基础 相似文献
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This paper presents an evaluation method for green jack-up drilling platform(GJDP) design scheme based on the improved grey correlation analysis(IGCA). Under the situation of the low-carbon economy it is important and complicated for jack-up drilling platform design to select the optimum design scheme from the feasible schemes. In this paper, the evaluation index system for GJDP has been proposed which includes 3 factors: advanced technology, economic feasibility and environmental coordination, as well as 13 sub-indices. At the same time, a multi-objective combinatorial optimization model is established by using IGCA, in which the analysis hierarchy process (AHP) is used to obtain the weight values of the indices. The IGCA method is fully considered the connection of the indices reflecting the objective true nature of the things, and the subjective interest of the platform owner and the needs of the designer. This research can not only conduct to green design of jack-up drilling platform, but also can contribute to the development, popularization and application of low-carbon technology on offshore platform. Finally, the case study results demonstrate the feasibility and efficiency of the proposed evaluation method. 相似文献
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Method of checking for jack-up elevated performance including leg structure strength, fixation system or jacking system bearing capacity, pre-load requirements, spud can bearing capacity and overturning stability is suggested in this paper. As an example, a jack-up with truss legs is analyzed by finite element analysis method. This paper may be helpful to the rig owners, operators and designers. 相似文献
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主要介绍了中国船级社对老龄海上移动平台加强检验的管理要求,对船龄超过30年的老龄移动平台实行特别现场检验和检测,并根据实际测厚数据进行平台结构强度校核,最终确定平台安全状况是否满足主管机关要求。以一个实际老龄自升式钻井平台为例,介绍了现场检验和检测要求,并通过实际计算分析指导现场进行结构加强,保证了此老龄平台日后的作业安全。中国船级社对老龄移动平台的管理手段开创了超期服役海上移动平台安全管理的新模式,对保障我国海洋工程装备安全生产具有重要意义。 相似文献
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Reliability Analysis of Ice-Induced Fatigue and Damage in Offshore Engineering Structures 总被引：8，自引：1，他引：7
《中国海洋工程》2000,14(1)
—In Bohai Gulf,offshore and other installations have collapsed by sea ice due to the fatigueand fracture of the main supporting components in the ice environments.In this paper presented are someresults on fatigue reliability of these structures in the Gulf by investigating the distributions of iceparameters such as its floating direction and speed,sheet thickness,compressive strength,ice forces on thestructures,and hot spot stress in the structure.The low temperature,ice breaking modes and componentfatigue failure modes are also taken into account in the analysis of the fatigue reliability of the offshorestructures experiencing both random ice loading and low temperatures.The results could be applied to thedesign and operation of offshore platforms in the Bohai Gulf. 相似文献
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Three types of ice loading, which are most commonly present when ice acts on structures, are chosen and simulated for use of fatigue crack propagation tests on offshore structural steel A131. The three types of ice categorized in accordance with the failure modes when acting on structures called crushing ice, bending ice, and buckling ice, respectively. This paper presents an experimental investigation on the fatigue crack propagation behavior of widely used high strength steel A131 for offshore jackets in the loading environment of ice crushing, bending, and buckling. The test results of fatigue crack propagation in steel A131 under these simulated ice loading at temperature 292K. are presented and analyzed in detail in this paper. The amplitude root mean square stress intensity factor is optimized to be the fundamental parameter of fatigue crack propagation for all types of ice loading histories. The results are also compared with constant amplitude fatigue crack propagation conclusions as in wave loa 相似文献
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The spectral methods and ice-induced fatigue analysis are discussed based on Miner's linear cumulative fatigue hypothesis and S-N curve data.According to the long-term data of full-scale tests on the platforms in the Bohai Sea,the ice force spectrum of conical structures and the fatigue environmental model are established.Moreover,the finite element model of JZ20-2MSW platform,an example of ice-induced fatigue analysis,is built with ANSYS software.The mode analysis and dynamic analysis in frequency domain under all kinds of ice fatigue work conditions are carried on,and the fatigue life of the structure is estimated in detail.The methods in this paper can be helpful in ice-induced fatigue analysis of ice-resistant platforms. 相似文献