浅谈沥青混合料路面接缝的施工方法

根据施工经验介绍了沥青混合料路面接缝的施工方法.     

Effect of obstacles on roads with different waviness values on the vehicle response

The effect of the increasing number of cosine-form obstacles, which are superposed on a standard homogeneous longitudinal road profile, is studied when the waviness of the basic road profile changes in the range from 1.5 to 3.5. First, the effect of the composed profile on the power spectral density (PSD) is analysed. It appears that the primary PSD in the form of a straight-line in the log-log plot breaks into two straight-line partial segments with quite different waviness values in the long and short wavelength bands. This seems to be a suitable model of a highly deteriorated road. Next, the effect on the response of two typical vehicles, viz. a personal car and a three-axle truck, is studied, and rather different results were obtained. In a summary valuation, it appears that the presence of additional obstacles causes independence of some of the vehicle response quantities of the primary waviness.     

基于管片错台的通缝拼装盾构隧道纵向变形安全评估

以上海软土地区通缝拼装地铁盾构隧道为研究对象,根据隧道管片环缝接头处的详细构造,对管片错台模式下的隧道纵向变形进行了研究,建立了隧道纵向结构变形安全评估方法,确定了相应的控制准则和评估流程,形成了一套隧道结构纵向变形的安全评估体系.     

基于截面力设定的纵梁轻量化半经验设计

采用半经验方法,通过分析同级对标车型的纵梁各断面通过力,获得了纵梁通过力的设计目标;根据本文提出的薄壁管梁压溃力公式,反推出纵梁所采用的尺寸、材料;根据结构轻量化原则,在概念设计阶段确定了纵梁的最优设计参数。通过对碰撞加速度、吸能盒、纵梁的试验与仿真结果对比可知,本文所提设计方法合理有效。     

Evolution of latent modal captivity and mode choice patterns for commuting trips: A longitudinal analysis using repeated cross-sectional datasets

This paper presents an investigation of the temporal evolution of commuting mode choice preference structures. It contributes to two specific modelling issues: latent modal captivity and working with multiple repeated crossectional datasets. In this paper latent modal captivity refers to captive reliance on a specific mode rather than all feasible modes. Three household travel survey datasets collected in the Greater Toronto and Hamilton Area (GTHA) over a ten-year time period are used for empirical modelling. Datasets collected in different years are pooled and separate year-specific scale parameters and coefficients of key variables are estimated for different years. The empirical model clearly explains that there have been significant changes in latent modal captivity and the mode choice preference structures for commuting in the GTHA. Changes have occurred in the unexplained component of latent captivities, in transportation cost perceptions, and in the scales of commuting mode choice preferences. The empirical model also demonstrates that pooling multiple repeated cross-sectional datasets is an efficient way of capturing behavioural changes over time. Application of the proposed mode choice model for practical policy analysis and forecasting will ensure accurate forecasting and an enhanced understanding of policy impacts.     

基于余度概念的受损船体总纵剩余强度预报

基于作者提出的结构余度概率衡准，并通过对船体构件损伤模型与船体总纵强度可靠性计算模型的讨论，本文建立了一个合理而筒便的受损船体总纵剩余强度预报方法。     

轨道电路纵向防护和第三轨效应研究

介绍了铁路信号轨道电路第三轨效应的产生原因;分析了轨道电路设置纵向防雷器的原因和第三轨效应与纵向防雷器的关系;阐述轨道电路装设纵向防雷器后应不会产生第三轨效应.轨道电路室内设备应按规定装设纵向防雷器和横向防雷器.     

基于纵向冲动的混编货物列车编组方案研究

考虑缓冲器内部斜楔结构的动、静摩擦状态转换以及车体底架结构的缓冲效应,对货车用缓冲器阻抗特性的计算方法进行改进,并在此基础上利用MATLAB软件建立21,23和27t轴重混编货物列车的纵向动力学模型,计算和分析不同空车比例及位置、不同轴重及载重、不同车型的混编模式对列车各车辆间纵向冲动的影响;研究有利于减小列车纵向冲动、降低空车脱轨概率的混编列车编组方案。结果表明:在空、重车混编时,应控制编入空车的数量,且尽量将空车集中置于列车的尾部,且要避开全重列车最大压钩力附近的车位;在有不同轴重及载重的车辆混编时,应将较重的车辆置于列车前部,较轻的车辆置于列车后部,并尽可能地按车辆重量递减依次编入;在用不同车型的车辆混编时,应避免将车体刚度较小的平车和罐车置于列车中部。     

小型高速SWATH船下体型线研究

根据帐篷函数法和切片理论分别编制了SWATH船的阻力、纵向运动理论预报程序,理论计算值与试验数据相一致.针对小型高速SWATH船主机置于下体后,下体型线的3种典型变化情况,理论分析了下体型线改变对SWATH船的阻力及纵向运动性能的影响,并对其做出综合评价.     

南京长江三桥导向船强度分析

由四只甲板驳通过两道纵向联接杆系和四组横向联接杆系所组成的工程船,用于南京长江三桥主桥墩的定位和施工平台.本文在对船舶荷载工况详细分析的基础上,对该船结构件(船体、联结梁)进行了强度分析,提出了合理的建议,以确保南京长江三桥塔基的施工精度及要求.