基于WIM数据的多车道随机车流模拟及汽车荷载效应

发布时间：2018-03-22 14:10

  本文选题：Monte-Carlo方法　切入点：汽车荷载　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：桥梁工程作为公路工程的枢纽,是交通运输的咽喉,而汽车荷载是桥梁使用阶段承受的主要荷载,是影响公路桥梁结构安全性和使用性的重要因素之一。本文以某高速公路WIM动态称重系统的交通调查数据为基础,分析研究了公路行驶车辆各参数的随机特性;通过K-S优度拟合检验法,计算行驶车辆各参数的特性分布类型及分布参数,采用Monte-Carlo方法进行车流模拟;根据梁格模型计算得到的各车道影响线,考虑横桥向多车道同时加载,按多种横向加载子工况(例如,左偏、居中、右偏),计算20~40m跨径装配式T梁在模拟车流作用下研究桥梁的荷载效应。基于WIM数据的基础上编制了一套可统计、可查询随机车流参数,根据统计参数生成随机车流,模拟汽车荷载效应程序。主要内容包括以下几个方面:1、阐述公路桥梁车辆荷载模型的研究现状,给出车辆荷载调查的详细流程;介绍了车辆荷载常用的几种概率分布类型及K-S分布优度拟合检验法;全面分析随机车流各参数,包括车型、车速、横向位置、车间距、车重及轴距参数等的分布类型及分布参数。2、利用某高速公路WIM数据分析其交通特性,并根据调查得到的车辆车型、横向位置、车间距、车重及轴距参数等数据,采用蒙特卡洛方法生成3个月的多车道随机车流数据;编制随机车流模拟车辆荷载效应仿真模拟软件,根据影响线加载原理计算了不同跨径简支梁、连续刚构、斜拉桥在模拟车流作用下产生的荷载效应,并与公路—Ⅰ荷载效应进行对比,以研究模拟汽车荷载效应和设计汽车荷载效应的差异性;采用Rice公式对设计基准期内样本桥梁的车辆荷载极值进行外推,研究了汽车荷载效应极值与设计汽车荷载效应之间差异。3、根据模拟随机车流提出一种计算横、纵向折减系数的新方法。采用不同车道加载不同车流数据的方法,计算车道横向折减系数,给出三个车道时的车道折减系数;计算随机车流作用下以不同跨径的车辆总重来计算数据,定义为其纵向折减系数,并给出了纵向折减系数公式。
[Abstract]:As the hub of highway engineering, bridge engineering is the throat of traffic and transportation, and the vehicle load is the main load during the use of the bridge. Based on the traffic survey data of WIM dynamic weighing system of a highway, the random characteristics of various parameters of highway vehicles are analyzed and studied. Through K-S goodness fitting test method, the characteristic distribution types and distribution parameters of each parameter of moving vehicle are calculated, the vehicle flow is simulated by Monte-Carlo method, and the influence line of each lane is calculated according to the beam model, and the multi-lane loading of the cross bridge is considered at the same time. According to various transverse loading sub-working conditions (for example, left deviation, center, right deviation, etc.), the load effect of the bridge is studied under the simulated traffic flow of 20m 40 m span assembled T-beam. A set of statistics is compiled on the basis of WIM data. The random vehicle flow parameters can be queried, the random vehicle flow can be generated according to the statistical parameters, and the vehicle load effect program can be simulated. The main contents include the following aspects: 1. The research status of the highway bridge vehicle load model is expounded. The detailed flow chart of vehicle load investigation is given, several kinds of probability distribution types and K-S distribution goodness fitting method are introduced, and the parameters of random vehicle flow, including vehicle type, speed, lateral position, distance between vehicles, are analyzed comprehensively. The distribution types and distribution parameters of vehicle weight and wheelbase parameters. 2. The traffic characteristics are analyzed by using the WIM data of a certain expressway, and based on the data of vehicle type, lateral position, vehicle spacing, vehicle weight and wheelbase parameters, etc. The Monte Carlo method is used to generate multi-lane random traffic flow data for three months, and a simulation software is developed to simulate the vehicle load effect. According to the loading principle of the influence line, the simple supported beams with different spans and continuous rigid frames are calculated. The load effect of cable-stayed bridge under simulated vehicle flow is compared with highway-鈪，

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