青藏线拉萨河特大桥主桥横梁设计

拉萨河特大桥主桥采用 (3 6+ 72 + 10 8+ 72 + 3 6)m五跨三拱连续梁钢管拱组合结构体系。通过对系杆拱桥不同部位横梁受力特点进行分析 ,采取相应的设计措施 ,为系杆拱桥的横梁设计提供一种合理的设计方法。     

基于HLA的分布式作战仿真系统

介绍分布式作战仿真系统的开发，重点提出了基于HLA技术的系统体系结构，分析在创建系统时的关键技术。     

HLA系统实施技术的研究

介绍了HLA的概况，主要介绍了HLA的框架和规则，接口规范以及开发HLA的标准流程。     

上海铁路西站南广场综合交通枢纽规划与设计

基于铁路上海西站枢纽的最新规划方案,在充分虑上海西站改建、城市轨道交通建设、城市综合交通枢纽成及上海西站南广场地块开发的背景下,从地下和地上空利用、设施布局、交通组织等角度,提出了一种新的上海西南广场综合交通枢纽的一体化规划设计方案.其设计理是:以轨道交通为核心,各种交通方式之间无缝衔接、复合同发展的铁路车站站前广场.     

浦东铁路开行市郊列车的客流需求研究

讨论了浦东铁路开行市郊列车的客流需求预测问题,为浦东铁路是否开行市郊列车、如何开行市郊列车方案提供依据.通过对浦东铁路沿线的居民出行调查得到浦东铁路的站间客流分布现状;在此基础上,利用沿线土地和人口发展规划.建立方式划分模型对未来5年及10年的市郊铁路客流进行预测;分析了市郊列车起终点站、发车频率、行车组织、交通衔接等因素对客流预测结果的影响.     

预应力锚索在高水位地层中的快速锚固技术

该文介绍了在生物岛-广州大学城隧道深基坑支护实践中,通过室内和现场生产实践,成功地将预应力锚索快速锚固技术应用于工程中,取得了6d～7d龄期施加预应力的锚固效果。     

交叉口行人过街心理及交通行为分析

行人与机动车的冲突是影响交叉口运行效率的重要因素。研究交叉口行人过街心理及行为的意义,分析行人过街过程及心理特征,总结行人过街等待时间、穿行速度特征、可接受间隙、违章行为及道路交通环境对行人心理和行为的影响,对行人的违章心理进行论述,并提出减少行人违章的措施。     

Assessing the technical efficiency, service effectiveness, and technical effectiveness of the world’s railways through NDEA analysis

This paper presents an approach to include both the unstorable feature of transportation service and the technological differences within railway companies in efficiency and effectiveness measurements. We explore efficiency and effectiveness for a group of 40 global railways in the year 2002, using traditional data development analysis (TDEA) and network data development analysis (NDEA). Comparing the results obtained from the NDEA model with those from the TDEA indicate that performance measures are quite different in terms of the magnitude, and even using different DEA type models to evaluate railway system performance does not distort the ranking of their performance. We also analyze the inter-related effects among three performance measures, finding that transportation service characteristics have positive effects on the evaluation of performance. Generally speaking, the NDEA model provides deeper insight regarding the sources of inefficiency and process-specific guidance to railway managers so as to help them improve their railway’s performance.     

辽宁滨海公路潮差侵蚀路段路基顶面标高的推算方法

结合辽宁省滨海公路填海路基的实际情况,分析了确定受潮差影响路段路基顶面标高的主要影响因素,提出了滨海公路路基顶面标高的推算方法,并结合实际工程给出应用案例.     

Vehicle response-based track geometry assessment using multi-body simulation

The assessment of the geometry of railway tracks is an indispensable requirement for safe rail traffic. Defects which represent a risk for the safety of the train have to be identified and the necessary measures taken. According to current standards, amplitude thresholds are applied to the track geometry parameters measured by recording cars. This geometry-based assessment has proved its value but suffers from the low correlation between the geometry parameters and the vehicle reactions. Experience shows that some defects leading to critical vehicle reactions are underestimated by this approach. The use of vehicle responses in the track geometry assessment process allows identifying critical defects and improving the maintenance operations. This work presents a vehicle response-based assessment method using multi-body simulation. The choice of the relevant operation conditions and the estimation of the simulation uncertainty are outlined. The defects are identified from exceedances of track geometry and vehicle response parameters. They are then classified using clustering methods and the correlation with vehicle response is analysed. The use of vehicle responses allows the detection of critical defects which are not identified from geometry parameters.