站场接触网软横跨预制和绘图程序

软横跨预测是电气化铁道接触网施工过程中的关键问题之一。本文叙述了在ＰＣ机上用Ｃ语言开发软横跨预测和绘图程序的步骤，并给出了计算实例，工程技术人员可根据屏幕上程序自动绘制的示意图对预制结果一目了然。     

燃料电池汽车储氢方案的安全性与实用性比较

分析了燃料电池汽车采用液氢、高压气氢和金属氢化物储氢3种不同储氢方案的安全性和实用性，结果表明液氢方案的加注站安全性、泄漏安全性和易操作性方面优于气氢方案，并且在有效载荷与空间、燃料经济性、续驶里程、加速性能和最高车速等实用性方面也好于气氢方案。     

乌池坝特长公路隧道斜井、竖井设计

即将开工建设的乌池坝隧道系沪蓉国道主干线恩施至利川高速公路上的特长隧道,为满足隧道运营期间通风、防灾救援要求,并综合考虑施工组织,设置了1斜井 1竖井。文章结合具体工程,叙述了斜井、竖井方案比较,以及斜井和竖井的布置、纵断面、净空断面、结构设计、防排水设计,介绍了斜井、竖井的施工方法。     

地铁施工期间交通疏解问题研究

章针对地铁施工期间交通疏解的难题，提出了一个科学、系统的解决框架，包括给出交通疏解研究的基本步骤，创建基本的交通仿真模型和评价体系。最后基于该框架．给出了深圳市地铁施工期间交通疏解的实例。     

透水沥青混合料的设计与施工

结合深港西部通道的施工,对透水沥青混合料在停车场的应用进行了探索性研究。根据停车场的交通条件和排水条件,确定了设计空隙率;通过对比试验,确定采用了TPS高粘改性沥青作为沥青结合料;提出了透水沥青混合料骨架嵌挤结构形成的检验方法;对设计的透水沥青混合料进行了路用性能检测,满足了停车场的排水功能和抗剪切性能;提出了适合于停车场的施工工艺。     

基于有限元轨道-车辆耦合模型的列车运行状态在线检测技术的仿真

通过对擦伤轮对的检测,描述了在线检测轨道车辆运行状态的布点方法.采用基于Timoshenko梁的有限元轨道车辆垂向耦合模型,仿真了在线连续测试车轮踏面擦伤的过程.仿真结果真实反映了实际的测试现象.     

浅谈排水工程中管材的选用

该文综合分析比较了排水工程中HDPE管和钢筋混凝土管的技术性能和工程造价,并结合莆田市荔港大道工程实践情况,对HDPE管的选用和施工注意事项进行探讨。     

Study of the post-derailment safety measures on low-speed derailment tests

Prevention of train from derailment is the most important issue for the railway system. Keeping derailed vehicle close to the track centreline is beneficial to minimise the severe consequences associated with derailments. In this paper, the post-derailment safety measures are studied based on low-speed derailment tests. Post-derailment devices can prevent deviation of the train from the rail by catching the rail, and they are mounted under the axle box. Considering the different structures of vehicles, both trailer and motor vehicles are equipped with the safety device and then separately used in low-speed derailment tests. In derailment tests, two kinds of track, namely the CRTS-I slab ballastless track and the CRTS-II bi-block sleeper ballastless track, are adopted to investigate the effect of the track types on the derailment. In addition, the derailment speed and the weight of the derailed vehicle are also taken into account in derailment tests. The test results indicate that the post-derailment movement of the vehicle includes running and bounce. Reducing the derailment speed and increasing the weight of the head of the train are helpful to reduce the possibility for derailments. For the CRTS-I slab ballastless track, the safety device can prevent trailer vehicles from deviating from the track centreline. The gearbox plays an important role in controlling the lateral displacement of motor vehicle after a derailment while the safety device contributes less to keep derailed motor vehicles on the track centreline. The lateral distance between the safety device and rails should be larger than 181.5?mm for protecting the fasteners system. And for the CRTS-II bi-block sleeper ballastless track, it helps to decrease the post-derailment distance due to the longitudinal impacts with sleepers. It can also restrict the lateral movement of derailed vehicle due to the high shoulders. The results suggest that, CRTS-II bi-block sleeper ballastless track should be widely used in derailment prone areas.     

少片钢板弹簧在实际应用中的开发与设计

以轻型载货汽车为设计平台,从少片弹簧的理论计算、动力学模拟、台架试验和整车道路试验等方面,阐述了其产品研发设计过程.从试验结果分析来看,理论计算刚度与台架试验刚度误差值仅为3.6%,符合工程需要;钢板弹簧应力分布趋势与理论计算曲线相同;U型螺栓夹紧处试验平均应力为415 MPa,而理论计算值为410MPa,二者吻合良好.     

独柱塔自锚式悬索桥锚固横梁结构空间受力分析

南京江心洲大桥边跨主缆锚固大横梁设计独特,结构受力非常复杂.为了获得锚固横梁局部应力的大小与分布规律,对其传力途径进行研究,以通用有限元程序为计算平台,采用空间索单元模拟横梁中配置的预应力束以及主缆束股,三维块体元模拟混凝土锚固横梁,应用二次开发技术,建立精细三维有限元模型.在此基础上采用合理的加载模式对锚固横梁在空缆阶段和成桥状态2种不同工况进行应力计算与分析.结果表明:在空缆与成桥2种状态下锚目横梁的应力值与分布规律变化较大;为保证锚固横梁在施工过程中的受力状态处在合理的范围之内,锚固横梁中配置的大量预应力束应配合主缆束股的内力变化而分批次张拉.