Finite element modelling of plate girders with web openings

This paper is concerned with a finite element model to predict the behaviour and ultimate load of plate girders with web openings. The finite element package is used to model the plate girders with web openings. Accuracy of the model is assessed by applying it to plate girders tested earlier by other researchers. Comparison of analytical results with the available experimental results for yielding patterns, ultimate load values and load–deflection relationships show good agreement between the finite element and experimental results thus validating the accuracy of the proposed model. The proposed finite element method was extended to carry out a parametric study. The study covered parameters such as web slenderness and flange stiffness.     

形态变异及实证--杭州金渡花城小区中心会馆形态生成过程描写

通过具体的工程实践,描述了形态生成过程及其基本方法,旨在探讨形态变异的可能性与多样性、偶然性与随机性、确定性与模糊性之间的关系。     

基于Web Services的楼宇自动化系统和集成技术的研究

分析了楼宇自动化工业的发展历程和目前所存在的主要问题，提出了基于XML，SOAP，WSDL和UDDI的Web Services技术是解决方案。介绍了Web Services的原理和关键技术，以及基于Web Services的楼宇自动化系统的集成技术、架构模型和实现原理。     

基于Web技术的水、电、气、热四表远程自动抄表系统软件设计

本文介绍了四表远程自动抄表系统的整体结构,以及系统软件的设计目标和Web服务器应用程序的五种类型,介绍了系统软件的Web服务器应用程序功能设计、普通Web客户端应用程序功能设计与数据采集控制终端应用程序功能设计。     

延续与发展——一条旅游发展轴的诞生

目前,平遥古城旅游业发展尚存在产业结构单一、基础服务设施较差等问题,新一轮总体规划又偏重于古城保护,忽视新区建设。因此,有必要建构一条从双林寺—古城的城市级“旅游发展轴”,以挖掘平遥古城旅游产业深层次发展的潜力,同时也对总体规划做一个有力的补充。     

Evaluation of web compactness limits for singly and doubly symmetric steel I-girders

This paper presents the results of research aimed at evaluating the web compactness limit for steel I-girders. Specifically, the paper tests the implications of a new web compactness limit equation provided in the 2003 AASHTO LRFD specifications [AASHTO LRFD bridge design specifications. 3rd ed. Washington (DC): AASHTO; 2003 [in press]] versus the web compactness limit in the 2001 AASHTO LRFD specifications [AASHTO LRFD bridge design specifications. 2nd ed. Washington (DC): AASHTO; 1998 [with 2001 interims]] and 1999 AISC LRFD specifications [AISC. Manual of steel construction, load and resistance factor design, Chicago (IL); 2001]. In both the AASHTO and AISC specifications, these limits are required for the nominal moment capacity to equal the plastic moment capacity of the girder, provided other requirements are also satisfied.The origins of the AASHTO [AASHTO LRFD bridge design specifications. 3rd ed. Washington (DC): AASHTO; 2003 [in press]; AASHTO LRFD bridge design specifications. 2nd ed. Washington (DC): AASHTO; 1998 [with 2001 interims]] web compactness limits are presented along with a performance evaluation of these equations. Specifically, resulting moment capacities from a comprehensive suite of finite element analyses are compared to the capacities that the respective limits are intended to provide. Results indicate the AASHTO (2003) web compactness provisions provide a more accurate representation of girder strength than those in the AASHTO (2001) and AISC (1999) Specifications.     

风景园林之于自然重建的意义

21世纪以来,世界人口的增长要求风景园林做出积极的贡献。生态系统服务概念为我们提供了一个框架,使我们理解风景园林对人类活动有着重大意义,并且呼吁在风景园林采取可靠的措施适应紧迫的人口增长。由于在人类交互作用、生态溢流和环境体制等方面受过专门的训练,风景园林师完全胜任引领这些景观设施的发展。     

浮动油封技术综述

本就工程机械中广泛应用的浮动油封技术概况，结构组成，分类、评价、主要技术要求，质量分等，试验方法及影响使用寿命的关键，进行了专题性分析与论述。     

优化机房管理，提高服务质量

计算机房是高校教学和科研的重要基地，是学生掌握计算机知识和计算机应用能力的重要场所。本文探讨了在新形势下如何对高校计算机房进行科学有效的管理，以便高效率地为学校的教学、科研服务。     

GPRS技术在燃气监测系统改造的应用

针对数传电台在燃气监测系统运行中存在的问题,论述了用GPRS网络替代数传电台的改造。