桥梁支座检测方法的探讨

随着交通基础设施工程建设的飞速发展和公路等级的不断提高,大型互通桥梁、高架桥梁日益增多．支座被广泛地使用于桥梁中。故加强支座的现场检测,提高支座的使用寿命,是保证桥梁质量的关键。     

引江济淮通航工程与长江连通航道布置

引江济淮工程是兼有供水、航运、生态等开发任务的跨流域、跨省份的战略性重大水资源配置工程。拟选择枞阳闸作为引江口门,并新建1000吨级船闸,作为菜子湖线路与长江连通的口门。核查枞阳小港航道条件,运用数学模型对船闸口门流态进行分析,得出枞阳小港具备开通航线的航道与通航条件。通过设计代表船型、设计航道宽度、水深、弯曲半径,提出连通航道的布置方案及合理的航线方案。     

A revised branch‐and‐price algorithm for dial‐a‐ride problems with the consideration of time‐dependent travel cost

Developing demand responsive transit systems are important with regard to meeting the travel needs for elderly people. Although Dial‐a‐ride Problems (DARP) have been discussed for several decades, most researchers have worked to develop algorithms with low computational cost under the minimal total travel costs, and fewer studies have considered how changes in travel time might affect the vehicle routes and service sequences. Ignoring such variations in travel time when design vehicle routes and schedules might lead to the production of inefficient vehicle routes, as well as incorrect actual vehicle arrival times at the related nodes. The purpose of this paper is to construct a DARP formulation with consideration of time‐dependent travel times and utilizes the traffic simulation software, DynaTAIWAN, to simulate the real traffic conditions in order to obtain the time‐dependent travel time matrices. The branch‐and‐price approach is introduced for the time‐dependent DARP and tested by examining the sub‐network of Kaohsiung City, Taiwan. The numerical results reveal that the length of the time window can significantly affect the vehicle routes and quantitative measurements. As the length of the time window increases, the objective value and the number of vehicles will reduce significantly. However, the CPU time, the average pickup delay time, the average delivery delay time and the average actual ride time (ART)/direct ride time (DRT) will increase significantly as the length of the time window increases. Designing the vehicle routes to reduce operating costs and satisfy the requirements of customers is a difficult task, and a trade‐off must be made between these goals. Copyright © 2014 John Wiley & Sons, Ltd.     

主客观综合评价法在内河航道选汊中的应用

内河航道建设中在分汊河段面临汊道选择问题,尤其是大型内河航道建设因投资巨大且对河段航道格局有长期影响,选汊涉及的因素繁多且无法直接比较。以长江南京以下12.5 m深水航道福姜沙河段的选汊问题为例,在对不同选汊方案的港口适应性、通航组织风险、航行干扰、施工期运营期风险、航道服务水平、锚地便利性、投资及航道维护等方面分析的基础上,采用主客观综合评价法(CRITIC),建立多目标决策评价模型。根据模型计算结果对选汊方案优劣排序,并进行稳定性检验,得出福中+福北方案为最优选汊方案。     

洒布车专用装置取力功率确定与校核计算

应用沥青洒布车相关设计知识与汽车理论,对CZ5090GLQ型沥青洒布车专用装置取力功率进行了校核计算,对沥青洒布车专用装置功率确定方法进行了探讨,经研究、分析及现场试验,验证了CZ5090GLQ型沥青洒布车专用装置从主车发动机取力功率设计的正确性。     

煤运铁路主线与矿区支线的选线设计探究

结合红淖铁路红淖段煤运主线与矿区支线的选线设计实践,讨论煤炭集运铁路主线与矿区专用线统筹考虑时的选线思路、原则和需考虑的问题。通过综合考虑矿区总体开发规划、矿区井田分布及煤炭主要流向,从压覆矿产、运输组织、带动地方经济发展、工程投资等方面,对煤运主线与矿区支线合建、分建进行综合分析,推荐采用不压覆矿产、符合地方规划,工程投资省、总费用现值小的红淖铁路煤运主线与矿区支线分建方案。     

树枝形专用线取送车问题的研究

本文基于树枝形专用线取送车作业的特点，就非直达车流连送带取（含单送、单取）这种常见情况进行分析，提出了三个优化目标，并给出了简便易行的优化方法。     

喀纳斯湖区旅游公路某支线改建技术方案

结合喀纳斯湖区旅游公路某支线改建工程实例,对公路改建中路基、路面工程及防排水的施工技术要点与施工中的注意事项进行探讨,可为相关工程项目提供参考.     

三峡水库运行对支流水库影响分析

以龙盛水库为例,按照三峡水库典型调度运行方式,建立一维数学模型,推求出三峡水库调度影响下御临河口长江水位(即龙盛水库坝下水位);并以典型年的时段划分方法,分析龙盛水库对应与三峡水库回水水位的关系,得出典型年时段下三峡水库坝前调度水位对应的龙盛水库调度曲线。对三峡水库运行下坝前水位、支流水库坝后水位及其坝前水位三者关系作出了分析。     

船舶淡水冷却系统流量分配的探析

对船舶淡水冷却系统流量分配问题进行探讨,在常规分支管路流量分配的计算方法的基础上,对该系统的流量分配提出新的流量补偿的计算法,并对实际施工提出建议。