基于多车道交通微观仿真的大跨度桥梁交通荷载  

Long-span Bridge Traffic Loading Based on Multi-lane Traffic Micro-simulation

作　　者：彭琳琳 

机构地区：[1]中交二航局第四工程有限公司,安徽芜湖241000

出　　处：《物流工程与管理》2016年第6期124-131,共8页Logistics Engineering and Management

基　　金：TEAM(欧洲资产管理培训)项目的一部分。TEAM项目属于一个居里夫人初始培训网络;由欧盟委员会第7框架计划(PITN-GA-2009-238648)进行资助

摘　　要：大跨度桥交通荷载由交通拥堵决定。尽管交通拥堵有多种形式,但先前的多数研究仅考虑了一列车队的情况。文中采用交通微观仿真生成若干个经过两座单向双车道大跨度桥的交通拥堵场景。为此,采用了一个公认的车辆跟驰模型并结合变道模型。根据其交通特点及其对桥梁荷载的影响,文中分析了不同交通组成和多种拥堵方式。结果发现:(a)根据跨距,缓慢移动交通流与完全停滞的交通流同样重要;(b)关键的车道内较长卡车队形主要为中速移动,且经常避开交通高峰期;(c)分布于不同车道内的卡车对总荷载影响有限;(d)轿车可以通过与卡车的交互作用对荷载产生较强的间接影响。文中的方法与研究结果与大跨度桥梁交通荷载的精确计算有相关性。Long-span bridge traffic loading is governed by congestion. Although congestion can take various forms,most previous studies consider only a queue of vehicles. In this paper, traffic micro-simulation is used to generate severalcongested traffic scenarios on a two-lane same-direction roadway passing over two long-span bridges. To this end, anacknowledged car-following model is coupled with a lane-changing model. Different traffic compositions and severalcongestion patterns are analysed in relation to their traffic features and influence on bridge loading. It is found that （a）slow-moving traffic may be as critical as the full-stop condition, depending on the span length; （b） critical long in-lane truckplatoons form mainly at moderate inflows, typically occurring outside of rush hours; （c） the truck distribution between laneshas a limited effect on the total loading; （d） the presence of cars has a strong indirect influence on loading through theirintemction with tacks. ITie methodology 肪d the findings have relev肪ce for computing a more accmate traffic loading ^long-span bridges.

关 键 词：大跨度桥 交通载荷 微观仿真 变道 拥堵 概率建模 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]