高大加筋土挡墙的安全性分析

结合重庆某滨江路高大加筋土挡墙的现场观测，应用改进的有限元计算方法和强度折减理论对高大加筋土结构的安全性进行评估分析。通过与简化Bishop法进行比较．两者结果比较相近。与其他工程事故资料对比，改进的有限元计算方法计算的滑动面位置更接近实际。有限元强度折减法优点是既能获得墙面变形，又能获得整体稳定安全系数，但安全判断的依据有待进一步分析研究。     

起重机用钢丝绳的损伤形式及防治措施

对起重机钢丝绳在使用过程中常出现的磨损、疲劳、锈蚀、变形、咬绳、过载等损伤形式进行研究,分析造成损伤的原因,提出相应的防止方法,以延长钢丝绳的使用寿命,保障码头安全生产.     

基于信号分析的Link16干扰策略研究

分析了Link16的信号特征,介绍了Link16编码方法和数据链信号的跳频方式.对干扰该系统的可行性进行了讨论,有针对性地提出了信号欺骗式干扰和同步段频点阻塞式干扰2种干扰方式.信号欺骗式干扰是在截获Link16信号基本参数后,生成并发出与Link16原始信号具有较强相关性的干扰信号,达到欺骗干扰的效果;Link16信号同步段只在8个频点上跳变,只要能将其中的5个频点阻塞,即可达到干扰效果.文章最后分析了干扰效果并给出了仿真结果.     

海上平台管道施工效率研究

一个工程项目的开展需充分考虑其运作的成本，在施工方面，提高施工效率是降低工程成本的一个重要方面。在海洋石油平台上进行管线施工作业，条件艰苦且风险较大，降低风险也是节约成本的重要方法。提出了提高海上平台管线施工的工作效率，减少施工时间措施。阐明从设计方法、建造施工方法两方面提高施工效率。     

The intelligent use of finite element methods

The structural analysis based on application of numerical methods used in the solution of complex structural problems, when applied correctly, is a powerful tool leading to rational structural design of ships. This paper discusses the practicalities of its application and indicates that in order to achieve the stated objective, the following are essential pre-requisites: a) full understanding of the problem; b) ability to solve the problem using currently available methods; and c) ability to interpret the results of the analysis correctly. Whilst there is still a lot of discussion on whether the structural analysis represents a structural design or a structural verification tool, the view expressed in this paper is that the structural analysis should mainly be used in the latter context. This means that a sound engineering solution ought to be established in the first phase of the analysis and used as a basis. The final results will then only be used to perfect the structural detail and modify the areas where rapid stress gradients occur. Any other approach would invariably require repetitive, time consuming and costly iterations which under normal circumstances may prove to be counter-productive. This paper presents a few examples of practical application, the methodology of achieving the solution and the way of interpreting the results.     

有限元元计算环境DPFEM的研究

利用Java语言对已有的有限元软件进行对象包装,并利用公共对象总线技术(CORBA)将它们包装成为可以远程调用的分布式计算组件,通过Java和CORBA的有机结合实现了异构网络平台上的有限元程序的互操作.在此基础上,给出了分布式有限元并行计算环境DPFEM(Distributed Parallel Finite Element Mehtod)的框架模型,实现了有限元元计算的原型.     

集装箱货物运输一口价的计算与程序设计方法

描述了中国铁路集装箱运输价格所涉及的计费径路、计费语言等关键技术的实现方法,对程序设计过程中所遇到的其他要点也进行了简要介绍.     

网格计算和信息共享

从网格技术提出的背景和其优越性出发,分析其协议体系结构及其各个协议之间的关系.详细介绍目前最为流行的开放网格服务体系结构OGSA的实现环境和接口机制,并且以一个基于OGSA的数据挖掘应用例子说明在多级虚拟网络运行环境下,网格服务是如何解决在从多个信息源集成信息过程中的远程接口激活,生命周期管理,通知和授权等功能的实现问题.这也是广域网环境下大型分布式系统中普遍存在的技术难点.     

公路新旧路基结合部的病害及处治

结合已有的工程经验,总结出路基结合部的主要病害及成因,并从改造方案的选择、基底处理、边坡清理、台阶开挖、路基填料、路堤加筋、路堤的压实度控制、施工工艺等方面提出了处治方法。     

A comparative study on damage assessment of tubular members subjected to mass impact

This paper focuses on the behaviour of tubular members when subjected to low-velocity mass impact. Particular emphasis is given to the numerical assessment of impact damage and the classification of impact response of tubular members. Damage extents of 12 tubular frame test models were predicted and used for quantifying the modelling uncertainties of the numerical tools. USFOS and ABAQUS software packages were used with beam and shell elements, respectively. Based on the test results and the parametric studies performed, the influence of the geometrical parameters and the interaction between the local shell denting and the global beam deformation modes are discussed. A classification of the impact response of the tubular members based on their relative resistance against shell denting and beam plastic collapse load is proposed. Finally, existing analytical models for each energy dissipation mode are visited and modifications are proposed.