Modeling the evolutions of day‐to‐day route choice and year‐to‐year ATIS adoption with stochastic user equilibrium

Suppose that in an urban transportation network there is a specific advanced traveler information system (ATIS) which acts for reducing the drivers' travel time uncertainty through provision of pre‐trip route information. Because of the imperfect information provided, some travelers are not in compliance with the ATIS advice although equipped with the device. We thus divide all travelers into three groups, one group unequipped with ATIS, another group equipped and in compliance with ATIS advice and the third group equipped but without compliance with the advice. Each traveler makes route choice in a logit‐based manner and a stochastic user equilibrium with multiple user classes is reached for every day. In this paper, we propose a model to investigate the evolutions of daily path travel time, daily ATIS compliance rate and yearly ATIS adoption, in which the equilibrium for every day's route choice is kept. The stability of the evolution model is initially analyzed. Numerical results obtained from a test network are presented for demonstrating the model's ability in depicting the day‐to‐day and year‐to‐year evolutions.     

区域公路网出行者信息系统咨询电话服务设计方法研究

信息发布设计是公路出行者信息系统设计的核心内容之一,研究信息发布对于改善道路的运行状况,提高区域路网的通行能力有着重要的意义。由于固话、手机的普及率比较高,使用便捷,因此,从交通管理者的角度来讲,咨询电话作为获取交通信息的渠道,是公路信息发布的重要方式之一。本文在分析区域公路咨询电话系统设计目的、设计定位和服务对象的基础上,提出了区域公路出行者信息系统咨询电话服务设计方法,从用户界面接口设计、菜单流程设计、语音库系统设计、系统容量确定、应用效果评价、宣传推广策略等六个方面对设计方法及设计内容进行了探讨。     

出行者出行方式选择行为的重复博弈分析

利用博弈理论,建立了出行者出行方式选择行为的博弈模型,并将一次博弈模型扩展至重复博弈模型.通过分析得到出行者合作策略稳定运行的条件,即当博弈方都比较注重长远利益的情况下会选择合作策略.由于出行者在进行博弈时,可能会“犯错误”,因此建立了具有颤抖效应的重复博弈模型,给出了博弈方在可能犯错情况下的收益,这种情况更符合实际,通过分析得到了在博弈方都比较注重长远利益的情况下均会采取触发策略.本文从理论上建立了有效地激励出行者选择公交车出行的决策机制、激励惩罚机制,并针对目前的公共交通现状给出了相应的对策与建议,以期为公共交通建设创新提供依据.     

重庆轨道交通三号线嘉陵江特大桥菱形挂篮设计与施工

结合重庆轨道交通3号线嘉陵江特大桥主桥挂篮施工的实际情况,介绍所用挂篮的构造、特点、结构计算,以及挂篮在曲线段准确就位等方面的主要施工技术。     

蟒蛇河大桥悬臂施工关键技术

蟒蛇河大桥是204国道跨越蟒蛇河的一座大型桥梁,上部结构为主跨115 m的预应力混凝土连续箱梁,采用悬臂浇筑法施工。该文以该桥为背景,对悬臂施工过程中0号块的锚固与支架搭设、挂篮的千斤顶预压、合拢段施工,以及施工控制等关键技术进行介绍,为同类工程的施工提供一定的参考。     

Multi-scenario optimization approach for assessing the impacts of advanced traffic information under realistic stochastic capacity distributions

In this study, to incorporate realistic discrete stochastic capacity distribution over a large number of sampling days or scenarios (say 30–100 days), we propose a multi-scenario based optimization model with different types of traveler knowledge in an advanced traveler information provision environment. The proposed method categorizes commuters into two classes: (1) those with access to perfect traffic information every day, and (2) those with knowledge of the expected traffic conditions (and related reliability measure) across a large number of different sampling days. Using a gap function framework or describing the mixed user equilibrium under different information availability over a long-term steady state, a nonlinear programming model is formulated to describe the route choice behavior of the perfect information (PI) and expected travel time (ETT) user classes under stochastic day-dependent travel time. Driven by a computationally efficient algorithm suitable for large-scale networks, the model was implemented in a standard optimization solver and an open-source simulation package and further applied to medium-scale networks to examine the effectiveness of dynamic traveler information under realistic stochastic capacity conditions.     

ATIS影响下的混合随机用户均衡交通分配模型研究

在考虑信息对出行者路径选择行为影响的基础上,基于路网混合随机用户均衡建模理论,建立了ATIS影响下的混合随机用户均衡交通分配模型,证明了该数学规划模型解的等价性,设计了求解算法,并利用算例进行了计算分析.     

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普遍认为先进的出行者信息系统(ATIS )能够有效地减少拥堵，提高出行者的出行质量.研究表明它所带来的效益并不是随着其市场占有率的增长而持续增加的，本文就此问题做了详细的探讨.首先综述了ATIS市场占有率问题的相关概念，在此基础上，详细介绍了近几年来国内外对ATIS市场占有率问题的研究成果.最后，分析了该领域研究中目前存在和需要进一步研究的问题，并提出了一些有效的改进方法.     

挂篮-支架加平衡重法施工关键技术及其应用

该文阐述了挂篮-支架加平衡重法施工变截面连续箱梁的基本原理以及关键技术。该方法成功应用于上海市A9高速公路西段拦路港大桥,取得了明显的经济效益和较大的社会效益。     

挂篮施工时宽幅混凝土箱梁横向框架的受力分析

以府河大桥主桥70+120+70(m)预应力混凝土连续梁为背景,对挂篮施工过程的箱梁横向框架进行了受力分析.结合分析结果,对大跨径、宽幅预应力混凝土连续梁结构设计提出了一些建议,为以后同类型桥梁设计提供参考.