库水位循环作用下架空斜坡式码头变形研究*

为研究山区河流库水位循环作用下码头结构变形特点,依托云南省富宁港一期工程,建立架空斜坡式码头三维有限元模型.以水岩相互作用为基础,重点研究库水位循环作用下架空斜坡式码头整体变形特点、桩基水平位移、桩顶沉降、挡土墙失稳模式;得到码头结构物变形发展趋势,同时预测架空斜坡式码头在库水位循环作用下的破坏方式,为进一步研究山区河流码头结构与库岸边坡相互作用及其时变特性提供基础.     

库区高水位差下斜坡码头岸坡稳定性分析

我国西南地区库区河段水位落差大,经常采用斜坡式码头来维持码头正常运营。为分析在高水位落差下斜坡码头岸坡的稳定性,本文以重庆市巴南区某码头实例为研究对象,借助ANSYS有限元计算软件进行三维模拟计算,研究最不利工况下码头应力分布及岸坡稳定。经计算,在最不利工况下,本工程岸坡变形均小于0.1cm,桩基变形均小于1.75cm,跨中横梁最大挠度与计算跨度比值小于1/600,满足规范要求。工程方案设计合理。     

内河大水位差条件下的码头岸坡稳定性分析

我国西南地区地势复杂,内河水位变化幅度很大,水位的变化使得内河码头的边坡含水量产生变化,由此引起的边坡水流渗透对码头的稳定性会造成很大的影响.采用理想弹塑性模型和摩尔库伦屈服准则进行数值模拟,通过对架空斜坡式码头岸坡在水位变化条件下的稳定性分析,得出了水位下降过程中各种因素对岸坡的影响;同时发现,岸坡岩土材料的黏聚力对岸坡的稳定性影响要大于内摩擦角.     

三峡库区变动回水区架空直立式码头结构形式研究*

从三峡库区变动回水区特殊的地形地质及水文条件出发,以寸滩港三期拟建工程为实例,通过对结构形式特点比较、施工方法论述及合理施工水位确定等要素的分析,对架空直立式码头结构进行排架跨度、基桩桩径优化设计,提出了适应于三峡库区变动回水区的大桩径、大跨度架空直立式码头结构形式,比传统的码头结构工程量减少、工程造价降低,并解决了三峡成库后低水位施工期短的难题。此研究成果可为库区码头建设提供良好的技术支持,具有一定的参考价值。     

三峡库区架空墩式散货码头结构承载性能研究

结合重钢环保搬迁大型散货出口码头建设和重庆寸滩架空直立式集装箱码头的成功尝试,提出一种适用于三峡库区大型散货码头的结构形式,即架空直立墩式散货码头。采用有限元方法建立码头结构的三维有限元模型,通过计算得出码头结构在不同工况下的位移和内力分布特点。研究表明,架空直立墩式码头是三峡库区大水位差、大流速、船舶大型化等条件下散货码头的合理结构形式。     

长江上游大水位差直立式集装箱码头装卸工艺

1 问题的提出 长江上游河段属山区河流,岸坡陡,水位差大,年最大水位变幅可达30～40 m.根据<河港工程设计规范>(GB50192-93)中的装卸工艺一般规定,设计水位差17 m以上宜采用斜坡式码头.以往长江上游地区集装箱泊位一般都据此建设斜坡式码头,例如重庆九龙坡集装箱专用码头.该斜坡式码头前沿系靠船设施为浮式趸船,趸船上配置2台固定回转起重机,斜坡道上配置4台横向缆车,坡顶采用轨道式集装箱门式起重机.     

泥沙淤积对川维厂码头影响的研究

根据模型试验结果,分析三峡建库后泥沙淤积对川维码头的影响,结果表明:建库后,本河段自然条件下河床淤积、冲刷规律有所改变,导致码头前沿及斜坡式码头泥沙大量淤积,影响码头作业条件。     

基于GIS系统的内河高水位差架空直立式码头灾害评估

根据规范方法并结合工程实际和内河大水位差码头关键技术问题,依托大量的数值计算,对内河大水位差架空直立式码头在各种荷载组合下的灾害进行了预测。利用ArcView将预测结果与地理信息系统有效地结合起来,建立了内河大水位差架空直立式码头灾害预测与管理系统,实现了港口安全评估的动态化管理。通过对系统测试数据的评估,可以有效提高码头的装卸效率,实时评估码头的安全性能。     

ORD在斜坡式码头设计中的应用研究

针对斜坡式码头,采用Bentley数字化平台内专业线性建模软件Open Roads Designer(简称ORD)进行三维设计,可以高效实现地形及构筑物的三维模型的建立,直观形象展示工程全貌。同时支持动态访问功能,可以在设计全过程中提取三维可视化模型信息,实时进行斜坡式码头的线型选择、断面预览及工程量计算等操作,提高了设计工作效率,为今后将三维设计应用于斜坡式码头工程提供了参考。     

大水位差架空直立式码头连续排架结构的水流作用研究

以重庆港寸滩码头三期工程的为依托,基于大涡模拟理论,应用有限元软件Fluent模拟高雷诺数条件下的三维流场,得出超临界状态下串联桩上的水流速度和压强,探讨码头结构各排架桩上的阻力系数、水流压强衰减、消能等相关规律,为三峡库区大水位差架空直立式码头在结构设计时考虑水流力的影响提供参考.     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

正~~     

第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。