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为了研究地震作用下遮帘桩对板桩码头前墙、锚碇墙以及拉杆受力性能的影响,运用ABAQUS软件对京唐港32#遮帘式板桩码头进行动力有限元分析.结果表明,遮帘桩可显著减小地震作用下前墙弯矩和拉杆拉力,对锚碇墙的受力性能影响较小;遮帘桩厚度对地震作用下拉杆拉力、泥面高程以下部分的前墙弯矩影响较大,对泥面高程以上部分的前墙弯矩和... 相似文献
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地震作用下场地液化是码头结构发生破坏的主要原因之一。针对一种20万吨级卸荷式板桩码头建立二维有限元数值模型,采用有效应力法对该码头结构进行动力时程分析,研究其在可液化场地条件下的受力变形特征以及周围土体的动力反应。结果表明:可液化场地条件下,板桩码头的前墙变形与传统单锚式柔性挡墙不同,未出现明显的凸胀变形;地震作用过程中前墙承担的弯矩最大,最大弯矩位于海底泥面附近;码头结构对周围土体的地震反应有放大效应,临空面对土体地震动峰值加速度(PGA)影响范围随地震强度的增加有减小的趋势;墙后填土液化范围随地震动强度的增加逐渐扩大,在0.50g情况下存在整体滑移的危险。 相似文献
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分别建立无锚式、单锚式和衡重式板桩码头有限元概化模型,并以某10万吨级板桩码头为原型,进行数值分析。结果表明:衡重式板桩的最大水平位移值分别为无锚式板桩的1/13和单锚式板桩的1/2;无锚式板桩入土段土压力分布突变明显,单锚式板桩入土面以上墙后土压力分布突变明显,衡重式板桩墙后和墙前土压力分布均较平顺;无锚式和单锚式板桩弯矩、剪力分布均出现多次反转,尤以无锚式板桩最明显,衡重式板桩除在衡重台位置出现弯矩突变外,其他位置弯矩、剪力分布均较平顺;工程案例分析中衡重式板桩桩身水平位移和弯矩属于正常范围,同时衡重式结构不需设置锚碇系统、后排灌注桩等组合结构,具有场地适应性强、施工简单和建设成本低等诸多优势,在板桩码头中具有较强的应用价值。 相似文献
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《水道港口》2016,(5):530-535
为探究地震作用下板桩码头结构动力响应,采用有限元软件ABAQUS建立了板桩码头二维有限元模型,对板桩码头进行了地震动力响应数值分析,研究了板桩墙入土深度对码头结构地震动力响应的影响及地震作用下的板桩墙后动土压力分布规律。研究表明:(1)板桩墙底部达到嵌固状态后,板桩入土深度的增加对于板桩墙的稳定性没有改善,反而小幅度增加了板桩顶位移及拉杆拉力;(2)地震模拟过程中的表层砂土动土压力较规范计算值偏大,其原因是板桩墙上部受到拉杆的约束作用及板桩墙自身变形,使表层砂土的动土压力更接近于动被动土压力,而在规范计算方法中表层砂土按照动主动土压力计算,表层砂土动土压力计算仍有待进一步完善。 相似文献
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以我国、美国和日本的港口码头设计规范、手册为基础,对我国、美国和日本港口码头抗震设计的方法进行了分析,同时介绍了国际航运协会标准《港口结构抗震设计指南》的有关规定。此系列论文共分6部分,该文为第4部分,分析和比较了我国、美国和日本规范中重力式码头和板桩码头抗震设计的方法。比较表明,对于重力式码头抗震设计,我国规范计算惯性力时考虑了加速度系数沿码头高度的变化,日本规范在基于地震危险性分析结果确定的地震系数中包含着要求控制的变形。对于板桩码头抗震设计,我国、美国和日本规范计算拉杆拉力和板桩墙弯矩时采用的方法不同。 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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《船舶与海洋工程学报》2014,(4)
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; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
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。 相似文献
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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). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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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. 相似文献
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桥梁防撞设施物理模型试验 总被引:1,自引:0,他引:1
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。 相似文献
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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。 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
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. 相似文献