Improving the efficiency of weigh in motion systems through optimized allocating truck checking oriented procedure

In the present paper, an effective procedure is proposed to determine the best location(s) for installing Weigh in Motion systems (WIM). The main objective is to determine locations for best performance, defined as the maximum number of once-checked trucks' axle loads and minimizing unnecessary actions. The aforesaid method consists of two main stages, including solving shortest path algorithm and selecting the best location for installing WIM(s). A proper mathematical model has also been developed to achieve objective function. The number of once-checked trucks, unnecessary actions and average installing costs are defined as criteria measures. The proposed procedure was applied in a road network using experimental data, while the results were compared with the usual methods of locating enforcement facilities. Finally, it is concluded that the proposed procedure seems to be more efficient than the traditional methods and local experts' points of view.     

级配碎石基层沥青混凝土路面非线性力学响应分析

为了明确级配碎石柔性基层沥青混凝土路面结构层位功能,就沥青混凝土面层厚度、级配碎石基层厚度和模量3个路面结构参数对级配碎石柔性基层沥青混凝土路面进行非线性力学响应分析,结果表明:面层厚度增大,基层最大剪应力降低,且面层厚度为9 cm时面层剪应力最不利,12 cm时面层层底拉应力最不利;基层厚度对基层剪应力影响不显著,且当基层厚度为30 cm时,面层剪应力、层底拉应力均出现最小值;当增大基层模量时,面层最大剪应力、层底拉应力和基层最大剪应力均有不同程度降低.     

Part 1. National road safety performance: Data,the emergence of two single-outcome modeling streams and public health

This first part of the state-of-the art focuses on the origins of road safety modeling, covering data, early models and the public health context of model formulation and use.     

Part 3. Multivariate road safety models: Future research orientations and current use to forecast performance

The third part of the state-of-the-art focuses on the future of road safety modeling and on conjectures concerning the evolution of national safety indicators. In the absence of econometric developments specific to road safety modeling, the research future must rely on pre-existing statistical procedures of econometrics applied to discrete/count and to aggregate data. In terms of contents, growing interest in the heterogeneity of road accident outcomes by category of victims could lead to treatments of this issue across research streams, say by top-down and bottom-up developments, but this speculation does not rest on extant adequate formulations of the issue of road user class and victim analysis. But understanding the time profile of aggregate national performance indicators is quite another matter.     

南宁市城市道路建设的影响因素分析

如何科学合理地进行城市道路网建设是目前城市建设的核心问题。文章以南宁市十二五期间城市道路网建设规划为例,介绍了城市道路建设影响因素的类别及内容,分析了交通基础设施建设、重大项目建设、旧城改造、管网建设、外围城镇发展等与城市道路路网建设的相互关系,并通过指标测算确定规划期内道路建设的合理规模。     

基于AHP的舰船器材仓库选址方法研究

分析了目前舰船器材仓库的现状和存在问题,提出了将AHP法运用于仓库选址的决策方法,结合实例肯定了AHP法能够为舰船器材仓库选址方案的优选提供一个客观、科学的定量与定性分析相结合的方法和决策手段。     

气垫船复合材料导管支臂制备工艺与性能试验

分析气垫船(Air-Cushion Vessel,ACV)复合材料导管支臂制备工艺的可行性,对导管支臂样件材料的组合设计方案进行优化,确定混合纤维环氧树脂复合材料-泡沫夹芯作为导管支臂材料.考虑导管支臂结构制造的经济性和可操作性,选择整体成型模式,采用真空导入模塑工艺(Vacuum Infusion Molding P...     

大型钢筋混凝土地下结构不设伸缩缝研究与实践——深圳福田综合交通枢纽取消伸缩缝案例分析

深圳福田地下综合交通枢纽具有超长、超厚、长高比大及施工周期长等特点,建设期间承受较大的温度收缩应力和干燥收缩应力。若设计伸缩缝,则会因为较多的伸缩缝对建筑外观、结构安全、防水质量、施工及耐久性产生不利影响。结合理论分析、设计计算等研究该工程不设永久伸缩缝的可行性。同时针对在不设永久伸缩缝的条件下,以控制主体结构不出现有害裂缝为目标,对工程结构形式、抗裂材料、施工要求、现场监测以及裂缝处理预案进行研究,提出了成套的技术方案。经过实践证明： 该工程在按照设计的抗裂结构形式、材料及施工要求等条件下,不设永久伸缩缝可以满足结构主体的抗裂要求。     

坑道超挖回填材料对衬砌受力和变形影响分析

坑道施工中,超挖回填材料性能对衬砌的受力分布有较大影响。基于FLAC 3D有限差分数值计算软件,模拟坑道开挖施工,通过改变回填层的弹性模量和厚度,分析了不同回填介质对衬砌结构弯矩和位移的影响,并比较了不同围岩级别对衬砌结构的弯矩影响。计算结果表明： 1）拱顶、侧墙和底板的最大弯矩随弹性模量的增大而减小,弯矩开始降幅较大,但最终趋于平缓;拱顶、侧墙和底板的最大弯矩随回填层厚度的增大而增大,几乎成线性增加。2）拱顶和底板的最大位移随弹性模量的增大而增大,侧墙反之;拱顶和侧墙的最大位移随回填层厚度的增大而增大,底板则基本保持不变。     

小直径双护盾TBM超前化学灌浆脱困施工技术

为快速解决小直径双护盾TBM刀盘卡机问题,结合引红济石输水工程引水隧洞实际施工情况,介绍了聚氨酯类（PUR）和硅酸盐改性聚氨酯类（Silicate Modified PUR）新型化学灌浆材料的应用技术。通过在刀盘内超前钻孔、在孔口混合和高压力灌浆实施双组分化学浆液,快速实现了加固坍塌体、软弱破碎岩层及有效脱困,体现了这种处理办法操作简单、耗时短、应用可靠的特点,TBM实现了快速脱困,大大节约了时间成本。结合工程应用实际提出了合理选择超前加固方法、预判围岩条件及卡机风险和采用聚氨脂类化学灌浆材料处理TBM卡机问题时,应根据围岩条件因地制宜调整材料的性能以达到经济实用的目的。