共查询到20条相似文献,搜索用时 62 毫秒
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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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以某122 m自升式钻井平台为分析对象,建立其有限元模型,包括材料非线性、几何非线性以及桩土非线性相互作用,在风浪流作用下,基于三维约束New Wave理论对自升式钻井平台的动态响应进行分析,研究海洋波浪方向传播特性和随机特性对平台动力响应的影响。在建立模型中实现风暴工况下水面高程和水粒子运动的描述,响应结果按甲板位移进行对比。结果表明,相比其它波浪理论,三维约束New Wave理论在平台动力响应分析中体现了一定的优越性,不仅能较准确地反映波浪的真实特性,而且能确保结构性能评估的安全性和合理性。 相似文献
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SONG Yupu FENG Sheng KANG Haigui
Professor Ph. D. PhD Supervisor State Key Laboratory of Coastal Offshore Engineering Dalian University of Technology 《中国海洋工程》1999,(3)
This paper proposes an optimum design medel for the offshore jacket platform considering multi-design criteria,multi-design constraints and the structure-pile-soil interaction,and gives an optimum designprocedure in which the proposed optimum design model is used together with structural analysis softwareSAP91 and optimum algorithm software OPBI.The Chengbei ~#11 offshore platform,which lies in theShengli oil field,is designed by use of the above optimum design model.The results show that the optimumdesign model is stable,and it depends on neither the optimization algorithm nor initial values of design vari-ables.All values of the objective function converge to the same minimum value,and the speed of conver-gence is high,showing that the proposed optimum design model is reasonable. 相似文献
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The concrete-steel platform structure is rather complicated because it involves such materials as concrete, reinforcing bars, steel, and so on. K the traditional dimension optimization method is employed, the optimal design of the platform will meet many handicaps, even it cannot be implemented at all. The multilevel optimal design approach is an efficient tool for the solution of large-scale engineering structures. In this paper, this approach is applied to the optimal design of a concrete-steel platform, which is formulated as a system level optimal design problem and a set of uncoupled substructure level optimal design problems. The process of optimization is a process of iteration between system level and substructure level until the objective function converges. An illustrative example indicates that this method is effective in the optimal design of concrete-steel platforms. 相似文献
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海洋深水区域日益成为海洋油气勘探开发的热点,但海洋深水地层因其特殊的沉积环境,致使深水钻井面临不稳定的海床、地层破裂压力低及海底低温等诸多的挑战,喷射导管技术是解决深水浅层所面临挑战的技术之一.该技术采用在导管内下入喷射动力钻具的方式,依靠导管串自身重力边钻进边下入导管,喷射到位后利用地层的黏附力和摩擦力稳固住导管,起出送入工具和管内钻具,完成导管的安装,避免因水泥浆密度过大而压破地层,也可避免由于深水低温等因素影响固井质量.通过对导管的受力分析,提出了导管的下深及导管串组成结构,同时也研究了导管在喷射安置过程中如何优选喷射钻进参数及采取的技术措施,确保导管喷射安置到预定位置,为海洋深水井导管设计与喷射安置导管提供了很好的参考与借鉴. 相似文献
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日本海岸线漫长曲折,沿海城市众多,在城市建设中,注重海岸利用与交通组织,注重自然环境与人文文化的结合,从城市管理、基础设施、建筑文化以及设计理念几个方面论述了日本滨海城市建设的经验教训,对我国滨海城市建设的土地利用、海岸的保护、规划和建设具有借鉴意义。 相似文献
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Song Yupu Wang Jian Associate Professor Dept. of Civil Engineering Dalian University of Technology Dalian Lecturer Dept. of Civil Engineering Dalian University of Technology Dalian 《中国海洋工程》1992,(1)
A design method of reinforced concrete (R. C.) offshore platforms with nonlinear finite element analysis is proposed. According to the method, a computer program is developed. In this program nonlinear constitutive relationships and strength criteria of concrete and steel bars are included, and the progressive cracking and crushing of the concrete are taken into account. Based on the stress distribution obtained by the nonlinear finite element analysis, the amount of reinforcement in the control sections can be computed and adjusted automatically by the program to satisfy the requirement of the design. The amount of reinforcement required in the control sections, which are obtained with the nonlinear finite element analysis, is agreeable to that obtained in the experiment. This shows that the design method of R. C. offshore platform with the nonlinear finite element method proposed by the authors is reliable for practical use. 相似文献
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某高层建筑基坑支护设计、施工与监测 总被引:1,自引:0,他引:1
基坑支护的设计、施工和监测是近年来在我国逐步发展起来的一项新技术。介绍了某高层建筑基坑土钉支护的设计、施工与监测,为高层建筑基坑支护的设计、施工以及监测提供参考。 相似文献
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海洋石油平台TMD振动控制及参数优化 总被引:1,自引:1,他引:1
研究了随机波浪载荷作用下调谐质量阻尼器(TMD)对桩基钢结构海洋平台的减振效果,采用谱分析法对TMD参数进行优化,优化TMD 使平台的位移响应标准偏差比无TMD下降12.4% 。并研究了TMD参数在优化域内的失调对响应的影响,TMD刚度失调比阻尼失调要敏感,欠阻尼失调比过阻尼失调要敏感。从振害累积概念出发,对谐激励下SDOF- TMD的Randall参数优化方法提出了改进。 相似文献
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The maximum internal tangential stress is a critical parameter for the design of the PDC (polycrystalline diamond compact) die that has been widely applied to offshore oil drilling. A new simple equation for the calculation of the stress is developed, and verified by the test data from Kingdream Corp. of China, the largest bit Company in China. An opti- mum method for the design of the PDC die is presented and demonstrated in detail, and software for the design and FEM analysis of the die is developed on the basis of the method. This software has been used in oil industry in recent years. 相似文献
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Xia Yongnian Senior Engineer Technical Research Institute for Sea-Going Ships China Classification Society 《中国海洋工程》1992,(1)
Fatigue design method is usually used for estimating whether a platform structure meets the requirements of fatigue resistance. It is described in API RP-2A and ZC rules for fixed offshore platforms, in which the allowable stresses for fatigue design are defined. In this paper discussed are the allowable stresses related factors, such as wave climate, structural response, fatigue behaviour of structural members. 相似文献