大跨径连续刚构桥0号块局部空间应力分析

以山西沁河大跨连续刚构桥为研究对象,利用Midas/Civil建立全桥杆系模型,分别获得施工及成桥阶段的最不利内力组合;采用Ansys软件建立空间有限元计算模型,对0号块空间应力进行了系统性分析.计算结果表明,除预应力钢束两端与混凝土接触点小范围区域内发生应力集中现象之外,其余绝大部分区域混凝土应力满足规范要求.分析过程中详细阐述了有限元模型的建立方法、荷载的施加、计算工况以及应力限值的确定原则,可为类似结构的分析和设计提供参考.     

CTCS-0级列控系统动态检测方法

阐述CTCS-0级列控系统构成及动态验收相关规范特点,提出应补充普速铁路动态验收规范的建议.参照高速铁路动态检测经验,从检测设备、检测案例、检测内容、检测计划等角度,研究CTCS-0级列控系统测试方法,并根据现场测试实践,总结出常见问题及典型案例,结合相关规范着重探讨信号机显示距离、轨道电路分路不良、引导接车进路显示H...     

浅谈北盘江特大桥箱梁0号段的施工与总结

通过总结惠兴高速公路北盘江特大桥0号段的施工技术经验,提出了连续刚构箱梁0号段在施工过程中应注意的主要事项,具有一定的实践指导意义。     

铁路客运站选址模型

将影响因素分为非强制性满足定性因素、强制性满足定性因素和定量因素,构建了铁路客运站选址模型。给出3类影响因素产生方法和过程,引入贡献值降低可能由定性因素引起的争议和分歧,通过改变综合贡献预设值大小,产生受非强制性满足定性因素和强制性满足定性因素约束的备选地点集合,建立由定量因素决定的目标函数,在所有约束下形成选址0-1...     

一种双频PIFA手机天线的设计与仿真

随着移动终端的发展,内置天线要求小型化,低剖面,能工作在不同频段下。文中提出了一种新颖平面双频手机PIFA（planarinvertedFantenna）天线。采用弯折路径,开槽缝隙加载的方法设计的双频PIFA天线。天线的工作频段覆盖了EGSM900（880MHz--960MHz）,DCS1800（1710MHz-1880MHz）的所有频率,工作性能良好。该天线结构易于实现,便于内置集成,适用于移动通信终端。     

A model of application system for man-machine-environment system engineering in vessels based on IDEF0

Applying man-machine-environment system engineering(MMESE)in vessels is a method to improve the effectiveness of the interaction between equipment, environment, and humans for the purpose of advancing operating efficiency, performance, safety, and habitability of a vessel and its subsystems. In the following research, the life cycle of vessels was divided into 9 phases, and 15 research subjects were also identified from among these phases. The 15 subjects were systemized, and then the man-machine-environment engineering system application model for vessels was developed using the ICAM definition method 0 (IDEF0), which is a systematical modeling method. This system model bridges the gap between the data and information flow of every two associated subjects with the major basic research methods and approaches included, which brings the formerly relatively independent subjects together as a whole. The application of this systematic model should facilitate the application of man-machine-environment system engineering in vessels, especially at the conceptual and embodiment design phases. The managers and designers can deal with detailed tasks quickly and efficiently while reducing repetitive work.     

山西省黄土路基强度指标相互关系研究

基于现场回弹模量E0和承载比CBR的测定,研究了二者之间的相互关系.通过对比回弹模量E0、压实度K、含水量w、承载比CBR的数据,提出广源(广灵～浑源)高速公路12标段路基各指标之间的换算关系,为黄土地区路面结构的设计提供可靠的依据.     

江肇高速公路西江特大桥主桥大体积大悬臂箱梁0#块施工

西江特大桥主墩0#块长18m,箱梁翼板宽28m(不含后浇段);0#块前后悬出部分长6.5m,中心梁高6.5m,共有1243.8m3。具有悬臂长、体积大等特点。本方案介绍了0#块钢管支架的设计及施工,重点解决了大悬臂根部容易开裂、大体积混凝土容易开裂等难题。     

基于最优化的横断面图绘制排版

根据当前线路CAD系统中绘制横断面图普遍遇到的问题，在AutoCAD环境下基于最优化设计思想，运用C 语言编制程序，实现了横断面图的全自动绘制排版，显的提高了横断面图的绘制效率。