300ft自升式平台极限工况强度评估

为了评估自升式平台极限工 况下的强度问题,采用有限元分析方法,基于ABS自升式平台结构规范,考虑平台工作载荷、风浪流等环境载荷、P-△效应等,应用谱分析方法确定设计波、设计载荷及设计工况,对平台的桩腿及主体结构进行了强度评估.通过对300 ft自升式平台的有限元分析计算表明:平台整体均满足屈服强度要求,高应力发生在桩腿与平台主体连接处;平台满足整体屈曲稳定性要求,独立构件的局部屈曲发生在桩腿与平台主体连接处.由此,连接部位是平台设计、强度评估需重点关注的.     

Finite Element Simplified Fatigue Analysis Method for a Non-tubular Joint of an Offshore Jacket Platform

This paper proposes the finite element simplified fatigue analysis method for fatigue evaluation of the composite non-tubular joint structure of an offshore jacket subjected to wave loads. The skirt pile sleeve of the offshore jacket, which had been in service, was taken as an example of the non-tubular joint structure. SACS software was used for global analysis of multi-directional wave loads for the jacket platform, and ALGOR software was used to build a finite element model, perform finite element analys...     

Experimental and numerical procedures of a sonar platform with a sound absorption wedge

Experiments involving a sonar platform with a sound absorption wedge were carried out for the purpose of obtaining the low frequency acoustic characteristics. Acoustic characteristics of a sonar platform model with a sound absorption wedge were measured, and the effects of different wedge laid areas on platform acoustic characteristic were tested. Vibration acceleration and self-noise caused by model vibration were measured in four conditions: 0%, 36%, 60%, and 100% of wedge laid area when the sonar platform was under a single frequency excitation force. An experiment was performed to validate a corresponding numerical calculation. The numerical vibration characteristics of platform area were calculated by the finite element method, and self-noise caused by the vibration in it was predicted by an experiential formula. The conclusions prove that the numerical calculation method can partially replace the experimental process for obtaining vibration and sound characteristics.     

大桥大体积承台施工技术探析

根据工程实践经验,从空心薄壁墩翻模施工技术、混凝土裂缝控制措施两方面进行分析,全面阐述大桥大体积承台施工技术,可供同行参考。     

大型立交桥环岛平台的结构分析

该文基于梁格理论对立交枢纽工程的环岛平台双向单箱多室扁平箱形结构进行结构计算简化,同时利用通用有限元程序对简化的梁格模型进行模拟分析,从而为求解环岛平台复杂内力提供了一种有效的途径,并且通过实例计算,与比拟板单元模型进行比较,分析结果表明该理论在工程应用中具有较好的实用价值,可供设计参考。     

钢桩内排泥技术在导管架拆除中的应用

内排泥作业是导管架拆除中的一个重要环节。主要介绍内排泥设备的原理及其在曹妃甸1-6油田单点导管架拆除中的应用,此设备的特点是工作效率高,安全可靠,无污染,适用范围广。     

自升式钻井平台桩靴结构分析

以某自升式钻井平台的桩靴为研究对象,建立了结构分析模型,给出了结构分析的载荷及边界条件,并对各工况下的计算结果进行分析和评估,为此类结构的设计提供参考方法。     

深水半潜平台的环境载荷分析

通过对南海水域环境下的深水式半潜生产平台的自存和作业两种工况的风载荷、波浪载荷和海流载荷计算,得到该平台的环境载荷特点,从计算结果看,风载荷、流载荷和波浪载荷对平台的影响相近,因此,在确定系泊系统的设计时,这三个因素的影响都不可忽视。     

军用UUV的发展与应用前景展望

UUV作为一种独具特色的水下作战力量,正在成为一种新的作战平台,受到各国海军的关注。文章在详细论述了uUV发展现状及其使命任务的情况下,结合潜艇武器系统的特点就军用UUV的组成、布放与回收、作战使用模式以及需要解决的关键技术进行了详细的论述,并展望了其未来发展前景。     

121.92m（400ft）自升式钻井船极限水深条件下插桩预测

根据南海121.92 m（400 ft）水深海域的海底土质特性,利用静力触探试验测试结果预测海底土的承载力,进而确定自升式钻井船插桩深度范围。结合理论计算和现场实际,得出南海121.92 m（400 ft）水深海域的自升式钻井船桩腿入泥深度数据库。