改进型后张法大管桩抗弯试验研究

采用四点弯曲试验方法,对6根改进型后张法大管桩进行抗弯试验,测得桩身开裂弯矩和极限弯矩,并与国内同类型高性能管桩的抗弯性能进行对比分析。结果表明：改进型后张法大管桩的抗裂性能有很大的提高,而极限抗弯承载 力提高不明显,在小范围内提高混凝土有效预压应力能提高管桩的抗裂性能;同时,悬臂端的长度对抗弯试验有很大的影响,悬臂端的最佳长度为0.08L~0.1L。     

循环荷载下大管桩抗裂性能试验研究

大管桩由于具有较高的极限、抗裂弯矩值,在基础工程中得到广泛应用。在近海工程中,由于桩基受到长期波浪、水流或靠船撞击等水平动力荷载,因此必须考虑大管桩的疲劳性能。通过循环荷载下的抗弯试验对D1200B32-2型大管桩进行抗裂性能研究,得到了试验样本的疲劳损伤变化并利用lgS-lgN曲线预测疲劳极限弯矩值,为大管桩的疲劳强度设计提供一定的参考。     

CSC桩接头的抗弯性能试验

本文通过CSC桩接头抗弯结构试验,研究其在各级荷载作用下接头锚具的工作性能,并分析其承载能力和破坏特征。试验研究表明CSC桩接头极限弯矩大于大管桩本体,在极限荷载作用下,锚具锚固性能良好．接头的抗弯性能可靠。     

后张法预应力混凝土长管节管桩抗弯性能研究

后张法预应力混凝土长管节管桩是采用离心工艺制作而成的单管节长度为8 m及以上的混凝土管桩,在港口工程桩基领域具有突出的优势。为研究其力学抗弯性能,通过对1 400 mm长管节管桩的抗弯性能进行理论分析,并对其管节和接头进行抗弯性能试验,监测加载过程中的变形和破坏情况。结果表明,长管节管桩的抗弯性能与其混凝土强度等级、张拉控制应力及预应力损失有较大关系;由于长管节管桩生产采用双层端模、分批张拉等工艺,使其具有优越的抗弯性能,是一种适用于沿海工程的高性能桩型,有广泛的应用前景。     

后张法预应力混凝土管桩预应力传递长度试验研究

后张法预应力混凝土大管桩由于抗弯承载力高和成本低等诸多优点,在港口工程中得到了广泛的使用.然而由于大管桩制作工艺的特殊性,使其具有类似先张法预应力混凝土构件的预应力传递长度问题.根据大管桩特有的预应力的施加方法,给出了其适用的预应力传递长度测试方法.并通过现场试验和理论分析,确定了大管桩端部预应力传递长度的分布规律,为设计提供可靠的依据.     

理事单位风采——莱州万力管桩有限公司

万力管桩 菜州万力管桩有限公司是国内继中交三航局之后，中国第二家研发生产后张法预应力高强度混凝土大直径管桩的企业。公司2006正式投产并取得国家各项检测认证，现在公司具有大管桩生产线一条和小管桩生产线一条，厂房面积9000平方米。固定资产9600万元。公司年产大直径管桩能力为15万米／年，为提高大管桩生产能力公司已准备改造小管桩生产线，届时大管桩年生产能力将达到25万米-30万米。     

Ф1200mm大管桩产量两次翻番的工艺及设备改造

预应力混凝土大直径管桩(以下简称大管桩)是三航局研制开发的国家“六五”重点攻关科技成果。大管桩用离心、碾压、振捣复合工艺，将干硬性C60混凝土加工成4ml节的管节，然后用后张预应力拼接成桩。大管桩是一种性能好、适用性强、造价相对低的桩型，十多年来三航局对大管桩的力学性能与     

理事单位风采——莱州万力管桩有限公司

莱州万力管桩有限公司是国内继中交三航局之后，中国第二家研发生产后张法预应力高强度混凝土大直径管桩的企业。公司2006正式投产并取得国家各项检测认证，现在公司具有大管桩生产线一条和小管桩生产线一条，厂房面积9000平方米，固定资产9600万元。公司年产大直径管桩能力为15万米／年，为提高大管桩生产能力公司已准备改造小管桩生产线．届时大管桩年生产能力将达到25万米-30万米。     

钢混组合桩应用技术

钢混组合桩结合了混凝土管桩造价低和钢管桩抗弯性能好的优点,其上部的抗弯能力与钢管桩相当,在一定程度上弥补了预应力混凝土大管桩抗弯能力不足的应用瓶颈,在满足工程质量要求的前提下又达到了降低成本的目的。结合工程实例对钢混组合桩的设计方法、可打性以及综合经济成本进行分析,为钢混组合桩的应用推广提供参考。     

后张法预应力混凝土管桩整体张拉技术

本文介绍了后张法预应力大管桩整体张拉技术及相关设备的技术要求。该技术是减少管桩分批张拉预应力筋预应力损失的有效途径之一。     

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

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33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 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;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

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。     

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.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

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）.     

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.     

某海港码头的撞损修复

依据码头撞击受损区域调查检测结果,对受损构件提出合理的修复方案,为码头的安全运行提供保障。