| 正压冲固平台结构分析中基础边界条件的影响 |
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| 引用本文： | 齐志会,杨树耕.正压冲固平台结构分析中基础边界条件的影响[J].海洋通报,2004,23(6):88-92. |
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| 作者姓名： | 齐志会 杨树耕 |
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| 作者单位： | 天津大学建筑工程学院,天津,300072 |
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| 基金项目： | “863”项目“正压冲固平台技术研究”资助 |
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| 摘 要： | 正压冲固平台是一种采用短桩加固基础的新型海洋采油平台，对于这种新型的平台结构，在结构分析和构件强度校核中必须考虑其有限元模型的基础边界条件处理问题。本文提出了正压冲固平台有限元计算模型中基础边界条件的一种简化方法，将两个水平方向的扭转自由度简化为扭转弹簧边界元，其余自由度简化为固定约束。通过计算分析得到了不同的边界约束刚度系数的取值对平台总体位移和强度校核应力的影响及变化趋势。结论是，平台结构对约束刚度系数K的反应在10^4～10^4之间时比较明显，对K的敏感度最为强烈：在此范围之外，平台反应分别接近于简支约束情况和刚性约束情况。尤其对于接近约束边界的单元，其应力变化最敏感。
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| 关 键 词： | 海洋平台 结构有限元分析 边界条件 |
| 文章编号： | 1001-6392(2004)06-0088-05 |
Influence of Boundary Condition on the Structure Analysis of Offshore Platform with Positive Pressure Spouted and Strengthened Pile Foundation |
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| QI Zhihui,YANG Shugeng.Influence of Boundary Condition on the Structure Analysis of Offshore Platform with Positive Pressure Spouted and Strengthened Pile Foundation[J].Marine Science Bulletin,2004,23(6):88-92. |
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| Authors: | QI Zhihui YANG Shugeng |
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| Abstract: | Positive pressure spouted and strengthened foundation is a new type of rigid pile foundation for offshore production platforms. For this type of platform structure, a simplified method of foundation boundary condition should be considered in its finite element analysis model. A simplified method of foundation boundary condition for this type of platform is suggested in this paper. The two horizontal torsional degrees of freedoms are simplified into torsional spring boundary elements, and the other degrees of freedom are all restricted to zero. The influence that different stiffness coefficients of torsional boundary spring elements have on the overall displacement and stress of the platform structure is obtained in the analysis, and its changing trend is found. As a result, it provides a great support for further analysis of this type of platforms. |
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| Keywords: | offshore platform finite element analysis of structure boundary condition |
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