Initial pre-stress finding procedure and structural performance research for Levy cable dome based on linear adjustment theory

The cable-strut structural system is statically and kinematically indeterminate. The initial pre-stress is a key factor for determining the shape and load carrying capacity. A new numerical algorithm is presented herein for the initial pre-stress finding procedure of complete cable-strut assembly. This method is based on the linear adjustment theory and does not take into account the material behavior. By using this method,the initial pre-stress of the multi self-stress modes can be found easily and the cal-culation process is simplified and efficient also. Finally,the initial pre-stress and structural performances of a particular Levy cable dome are analyzed comprehensively. The algorithm has proven to be efficient and correct,and the numerical results are valuable for practical design of Levy cable dome.     

寿宁县九岭溪悬索桥吊装施工方法与技术分析

详细介绍了寿宁县九岭溪钢筋混凝土加劲桁架式悬索桥主缆架设、桁架预制、拼装、拖运和吊装的施工方法,对该形式的悬索桥施工进行经验总结并提出改进措施.     

Aerodynamic stability of cable-supported bridges using CFRP cables

To gain understanding of the applicability of carbon fiber reinforced polymer (CFRP) cable in cable-supported bridges, based on the Runyang Bridge and Jinsha Bridge, a suspension bridge using CFRP cables and a cable-stayed bridge using CFRP stay cables are designed, in which the cable’s cross-sectional area is determined by the principle of equivalent axial stiffness. Numerical investigations on the aerodynamic stability of the two bridges are conducted by 3D nonlinear aerodynamic stability analysis. The results showed that as CFRP cables are used in cable-supported bridges, for suspension bridge, its aerodynamic stability is superior to that of the case using steel cables due to the great increase of the torsional frequency; for cable-stayed bridge, its aerodynamic stability is basically the same as that of the case using steel stay cables. Therefore as far as the wind stability is considered, the use of CFRP cables in cable-supported bridges is feasible, and the cable’s cross-sectional area should be deter-mined by the principle of equivalent axial stiffness.     

边坡加固锚索预应力损失的探讨

锚索预应力损失问题是关系到锚固工程安全与否的重要因素。通过对相关边坡工程的监测资料分析，探讨预应力锚索加固边坡的机理、锚索预应力损失的影响因素以及锚索预应力的变化规律，并在此基础上提出应力补偿的措施。     

农网改造中架空绝缘电缆的设计及施工

该文阐述了架空绝缘电缆的特点、规格、敷设方式,应用区域和设计及施工。     

校园监控网络建设中光纤通信的应用与研究

本论文针对通信领域日新月异的光纤通信技术,阐述了不同环境中适用的电缆和光缆的发展趋势,并就本地校园监控网络建设中光纤通信的应用提供了一种设计方案．     

有线电视前端信号系统的构建及维护

有线电视前端机房承担着将广播电视节目的信号有效传输到千家万户的重要任务,它的作用在于及时分配和处理由天线接收的各种自办节目和电视节目的信号。如果想有效确保整个有线电视系统的质量,那么就必须保障有线电视前端系统实现优质、安全地播出。本文首先阐述了有线电视前端信号系统的重要性,其次,分析了现代有线电视网的前端信号系统类型。同时,就有线电视前端信号系统的构建及维护进行了深入的探讨,具有一定的参考价值。     

传输局站直流配电原则探讨

在科技飞跃发展的今天,电成为我们生活的必需品,而无处不在的通信网络为我们的工作、生活提供了方便,使我们的生活更加多姿多彩。通信电源作为通信网络的心脏,对保障通信网络安全可靠运行起着至关重要的作用。     

面向快速制造的一种爬缆机器人结构设计

利用爬缆机器人进行缆索检测是目前开始采用的方法。考虑到爬缆机器人单件制造的特点．本文基于快速制造思想提出了一种多滚轮夹缆的框架式缆索检测机器人结构。通过大量采用MISUMI商品化零件和手板加工技术,实现了大大缩短样机制造周期的目的。     

基于eM-Plant的车间人员配置仿真研究

以线缆制造企业中绝缘挤出工段的生产线为例,借助于面向对象的eM-Plant软件,运用生产线平衡方法,对生产线的工人利用率、产量的控制等方面进行精益改善,以辅助企业管理者有效进行车间作业调度与人力资源配置,帮助广大制造企业利用现代化智能仿真技术转变生产方式,最大限度释放潜在产能,实现科学发展与绿色发展。