深水FPSO主起重机基座结构设计
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中国海洋石油国际有限公司

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Structural design of main crane pedestal on deep water FPSO
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CNOOC International Limited

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    摘要:

    FPSO主起重机作业时在基座结构处产生交变应力,基座结构设计应开展总体布置、屈服强度、刚度和疲劳寿命的优化。以某西非深水FPSO的折臂式主起重机基座为例,介绍石油公司企业标准对起重机基座结构的技术要求。按BV船级社规范要求,应用PATRAN/NASTRAN软件分析起重机基座结构静力强度和刚度,确定了FPSO主起重机基座与船体结构界面处的局部加强设计和海洋工程区。按API、DNV船级社规范要求和“热点应力法”,应用DNV SESAM软件评估了起重机基座结构典型热点的疲劳寿命。结果表明:基座结构典型疲劳热点的疲劳损伤以由起重作业载荷造成的低周疲劳损伤为主。通过优化FPSO主起重机基座结构的总体布置和界面处的局部结构设计,确保了结构强度、刚度和疲劳性能。

    Abstract:

    Alternating stress occurs at the crane pedestal structure when FPSO main crane works. The optimization of general layout, yield strength, stiffness and fatigue life should be done in structural design of crane pedestal. Taking main crane pedestal of a deep water FPSO offshore West Africa as an example, the technical requirements of Oil Company’s General Specifications for crane pedestal are introduced. As the requirements of BV Classification Society rules, PATRAN/NASTRAN software is applied to analyze the static yield strength and stiffness of crane pedestal, so that local reinforcement design and Offshore Area of FPSO main crane pedestal and hull interface structure are determined. As the requirements of API, DNV Classification Society rules and Hot Spot Stress method, the fatigue life of typical hot spots of crane pedestal is evaluated by DNV SESAM software. The results show that low cycle fatigue damage caused by crane lifting load is the main part of fatigue damage of typical hot spots on crane pedestal. By improving general layout of FPSO main crane pedestal and local interface structure design, the yield strength, stiffness and fatigue performance of crane pedestal is ensured.

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  • 收稿日期:2020-12-22
  • 最后修改日期:2020-12-22
  • 录用日期:2021-01-20
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