气浮结构的静浮态分析

本文介绍了半封闭浮筒内的压缩空气对结构的气浮状态和浮稳性的影响机理,建立了气浮结构静稳定浮态的计算分析方法。假设浮筒内的空气为理想气体,导出了气浮力的计算公式和气浮结构的力平衡关系。据此给出了气浮结构的各种牧场生的计算方法。理论计算结果与模型试验和现场试验数据吻合,表明这些计算理论可以在工程中应用。合理地利用气浮特性可对一些大型的无底筒型工程结构进行海上气浮拖运和安装施工。     

增强结构气浮稳性的分舱法及优化分析

文章以气浮稳性分析理论为基础,针对单体气浮结构,提出了通过分舱增强其浮稳性的方法,并绘出了分舱结构气浮稳性的计算方法。对舱格布置的优化分析表明等分舱格时结构气浮的稳性最佳。以箱型基础结构和圆形简为算例,介绍了单体气浮结构中分舱方法的应用。     

气浮结构的小倾角浮稳性分析

本文建立了气浮结构小倾角浮稳性分析的理论方法。与实浮体（常规浮体）相似，气浮体的小倾角浮稳性也可以通过稳性高能数来判断。文中首先推导出非对称多体实浮结构的稳性高参数的计算式，在此基础上，引进气浮体的浮态分析理论，导出了非对称多体气浮结构的稳性高的计算式。理论计算得到了稳心半径与模型试验和现场原型试验的测算值非常吻合，表明本文建立的气浮结构小倾角浮稳性分析理论是符合实际情况的，可以在工程中应用。     

箱筒型基础防波堤断面稳定计算方法

箱筒型基础防波堤是一种软基上的新型防波堤.针对其断面稳定性的分析建立了三类计算方法:有限元分析方法、数值极限平衡分析方法和简化极限平衡分析方法;对三类计算方法的特点进行了比较,并以此对天津港南北防波堤延伸工程的箱筒型基础防波堤结构进行了优化.     

防波堤箱筒型基础结构气浮拖运与负压下沉工艺

以天津港箱简型基础防波堤试验工程为例，介绍了防波堤箱简型基础新结构及基础结构气浮拖运和负压下沉的新工艺，实践证明：这种国内首次开发的新工艺，安全可靠，耗能少，操作简单，适用于淤泥质地质条件下的防波堤、导堤及护岸工程。     

《中国港湾建设》期刊2007年总目次

[注]编排顺序为“文题-作者-出版年份-期号-页码”综合一种设计潮位推算方法在深水筑港中的应用………………………王震,李增勇,魏有兴2007.1.1桩柱水流绕流阻力特性及其计算………………………………………………………邓绍云2007.1.4高桩码头叉桩震害分析及设计建议…………………………………………龙炳煌,雷立志2007.1.7圆形基坑地连墙支护结构监测分析…………………………………孙文怀,斐成玉,邵旭2007.1.11箱筒型基础结构气浮拖航的稳性计算…………………………………………………彭增亮2007.1.15动力沉桩中土体疲劳的计算方法探讨…     

箱筒型基础结构建造及应用的检测程序和方法

箱筒型基础结构作为一种新型基础结构在工程中逐渐推广应用,目前还没有专门针对这种结构在工程中应用的检测规范.针对箱筒型基础结构的特点和作用机理,结合其在工程中应用的实际,提出箱筒型基础结构建造及应用的检测程序、技术要求和方法,包括原材料、焊接质量、结构外形尺寸、除锈、涂装、气密性、抽气系统、浮运系统、就位位置等检测内容,按照相应的检测技术要求和方法进行.箱筒型基础结构检测程序和方法的提出对于其在工程中的应用具有指导意义.     

从实测数据判断箱筒型结构在风浪作用下的稳定性

箱筒型结构是一种新型的防波堤结构。通过土压力、孔隙水压力、振动、波浪、十字板等数据,对箱筒结构在大风浪作用下的稳定性进行了综合分析,得出在大风浪作用下箱筒稳定的结论。该结构适用于软土地基,工程费用低,建设速度快。     

波浪荷载作用下箱筒型基础防波堤性状试验研究

箱筒型基础防波堤是一种新型的防波堤结构,适用于较深水域且海底为软土地基的筑堤情形.然而,这种新型防波堤出现时间较短,对其性状表现的认识尚在积累中,采取何种破坏模式进行设计计算是一个关键难题.为此,开展了土工离心模型试验,探讨了波浪荷载强度、波浪作用持续时间、结构下筒长度和压载等因素对防波堤结构位移模式的影响.试验在离心机高速运转条件下模拟了周期性循环波浪荷载,观测了箱筒型基础防波堤的水平变位、沉降和倾斜以及地基中孔隙水压力等反应.结果发现,修建于给定条件地基上的箱筒型基础防波堤能够很好地抵抗设计荷载强度波浪作用,所发生的沉降、水平变位和倾斜度均不会超出相应的控制值,其主要位移破坏模式为防波堤倾斜过度而失稳或水平变位超出容许值而发生侧向滑动破坏.     

筒型基础结构稳定性分析的有限元方法

筒型基础结构是适用于软土地基的一种港口与海岸工程结构型式,依靠沉人地基的下部圆筒的嵌同作用维持结构的稳定性.文中给出了构造筒型基础结构-地基系统弹塑性有限元数值模型的要点,提出了基于有限元数值计算结果进行结构稳定性判别的准则,建立了筒型基础结构稳定性分析的有限单元方法,并通过实例计算进行了检验分析,表明筒型基础结构稳定性分析的有限元方法是准确、可靠的,可用于港口与海岸工程结构稳定性设计计算.     

FX自升式平台拖航稳性研究

自升式平台在拖航移位时,大部分桩腿位于平台上部,受风面积很大,在平台拖航移位过程中会受到很大的风倾力矩,有可能导致平台倾覆,故需对平台拖航进行稳性分析研究,确保平台拖航安全。本文提出了一种利用Moses软件对FX自升式平台进行完整稳性和破舱稳性分析的方法,该方法简单实用,计算效率高。使用该方法分析平台稳性,得出如下结论：自升式平台的吃水越大,其稳性越差;FX平台完整稳性的危险风向角为15度,破舱稳性的危险风向角为120度,最危险的破舱组合为压载舱2和4。论文成果可为类似平台的稳性分析提供参考,为平台的安全拖航提供技术支持。     

128m打桩船桩架结构强度及模态分析

以128 m打桩船桩架为分析对象,利用ANSYS有限元软件建立桩架结构三维模型,模拟其在有风起吊、放置拖航这两种工况下的各构件应力及结构响应状态,校核桩架整体结构强度和稳定性,同时对桩架结构进行模态分析。模拟结果表明,桩架在这两种工况下的材料强度满足安全要求,并就所得数据对桩架的运行安全提出建议。     

The wet-towing resistance of the composite bucket foundation for offshore wind turbines

The composite bucket foundation (CBF) is a new and environmentally-friendly foundation for offshore wind turbines. This foundation can be prefabricated in batches onshore followed by integrated transport and installation at sea. The structure itself has a subdivision air cushion structure that enables the foundation to float stably on the water surface and realize long-distance towing of the foundation. The mechanism of this air-liquid-solid coupling towing process is complicated, and the influence of the bulkheads on the towing resistance is not clear. In this paper, the influence of the subdivision structure on the towing resistance of the CBF is compared with the tow test in hydrostatic water. The structural motion characteristics and the change of the cushion pressure are also analysed. Experiments are used to verify numerical calculation results. The flow field difference between the CBF with bulkheads, the CBF without bulkheads and the real floating structure was analysed. The dynamic pressure coefficient was used to analyze the force at surfaces of different CBF's. For the tow test and numerical calculation of multiple CBFs, the optimal multi-CBF tow distance and towage number are obtained through the calculation of energy consumption rate.     

Competition in ship handling: a study of market turbulence in North European harbour towage

This paper addresses the issues of an increasingly competitive towage industry in Northern European ports. Enhanced competitiveness reflects the trends in the global mobility of capital, labour, enterprise and management within the context of deregulated port markets. Up until the early 1990s, the long term trend in major North European ports had been towards market concentration. Many small towage firms have been taken-over, bought out or merged. Alternatively, a pattern of consortia has emerged with co-operation and market sharing seen as preferable to ruinous competition. A contrasting trend has occurred in the 1990s, with new entrants into hitherto stable markets. In a number of ports Antwerp, Rotterdam, Bremerhaven, Hamburg, Southampton, Thamesport, Bristol Channel new fleets have brought competitive challenge to the incumbent towage fleets. The process of enhanced competitiveness raises questions of safety, reliability, investment and professionalism. The movement towards an openly competitive shipping industry has been in evidence from the 1960s onwards. The momentum of a dynamic shipping industry, with its competitiveness sharpened by the use of global supply factors, has intensified from that period. The movement in European tonnage towards flags of convenience and global labour supplies began in the tanker and bulk carrier markets; more recently this has spread to deep sea liner, short sea and even cabotage trade shipping. The towage industry is the last North European shipping sector to make this transition, following the trends towards port deregulation in the 1990s. From this perspective, this paper considers the impact on the towage market of global mobility and deregulation in North European towage markets the impact of increased competition on the traditional operators and the likely effect on operational towage standards.     

Competition in ship handling: a study of market turbulence in North European harbour towage

This paper addresses the issues of an increasingly competitive towage industry in Northern European ports. Enhanced competitiveness reflects the trends in the global mobility of capital, labour, enterprise and management within the context of deregulated port markets. Up until the early 1990s, the long term trend in major North European ports had been towards market concentration. Many small towage firms have been taken-over, bought out or merged. Alternatively, a pattern of consortia has emerged with co-operation and market sharing seen as preferable to ruinous competition. A contrasting trend has occurred in the 1990s, with new entrants into hitherto stable markets. In a number of ports—Antwerp, Rotterdam, Bremerhaven, Hamburg, Southampton, Thamesport, Bristol Channel—new fleets have brought competitive challenge to the incumbent towage fleets. The process of enhanced competitiveness raises questions of safety, reliability, investment and professionalism. The movement towards an openly competitive shipping industry has been in evidence from the 1960s onwards. The momentum of a dynamic shipping industry, with its competitiveness sharpened by the use of global supply factors, has intensified from that period. The movement in European tonnage towards flags of convenience and global labour supplies began in the tanker and bulk carrier markets; more recently this has spread to deep sea liner, short sea and even cabotage trade shipping. The towage industry is the last North European shipping sector to make this transition, following the trends towards port deregulation in the 1990s. From this perspective, this paper considers the impact on the towage market of global mobility and deregulation in North European towage markets—the impact of increased competition on the traditional operators and the likely effect on operational towage standards.     

沿海66m运石船吊臂结构强度有限元分析和稳定性校核

摘 要：利用MSC/Nastran软件对吊臂结构在4种工况下进行了强度有限元分析,并对其稳定性进行了校核。文中介绍了载荷的计算方法和约束条件的施加方法。通过有限元分析得到的结论对同类型吊臂结构的设计和强度分析有一定的参考价值。计算结果表明该吊臂结构强度和稳定性符合规范要求。     

大跨连续刚构桥施工阶段稳定分析

结合四川在建的新民岷江特大连续刚构桥工程实例,考虑结构的几何非线性、材料非线性和初始缺陷,对该桥最大悬臂施工状态下结构的稳定性进行了数值分析。计算得到了该状态下结构的稳定系数、屈曲模态和墩底截面的极限承载力,并提出了大桥施工过程中加强稳定性的措施。     

多指标决策在拖带方案优化设计中的应用

为了克服主观权重决策和熵权决策的缺陷，文中建立了基于综合权重的多指标决策模型。分别从主观和客观两个方面来分析评估指标的权重，迭加得到综合权重，利用综合权重来进行优化决策分析，并根据标准差来校核优化算法的合理性。以拖带方案的优化决策分析为例，简述了多指标决策方法在船舶拖带作业中的应用。     

某起重铺管船航行中的托管架绑扎校核与结构分析

基于MOSES软件,建立某起重铺管船的船体模型及船体-托管架模型,计算船体-托管架在极限工况下的运动响应,得到船体-托管架的响应幅值算子(Response Amplitude Operator, RAO)值,将RAO值导入结构分析计算机系统(Structural Analysis Computer System, SACS)进行船舶航行中的托管架绑扎校核与结构分析。计算结果显示,在极限环境条件下,该船的稳性、总纵强度及艉部托管架结构均满足航行安全要求。计算方法可为同类船舶的航行安全提供参考。