基于实测数据与CA交通流模型的桥梁汽车荷载研究

发布时间：2018-04-29 01:30

本文选题：公路桥梁 + 汽车荷载　；参考：《长安大学》2014年硕士论文

【摘要】：对于中小跨径桥梁结构，交通运输中的重型车辆对其汽车荷载起决定作用；对于大跨径桥梁结构，影响其汽车荷载量值的因素还包括车型比例、交通流的运行状态等。本文根据国内两个地区的车辆荷载长期实测数据，分析了两个地区的交通流参数特征；计算了两个地区实测车辆荷载作用下中小跨径简支梁的内力分布，并与设计汽车荷载效应进行对比；引入CA交通流模型对影响大跨径桥梁汽车荷载量值的主要交通流参数进行了讨论。主要完成了以下工作： 1）根据104国道为期30天、宣大高速为期180天的实测车辆荷载数据，对比分析了两个地区不同车道各车型的占有比例、车重车速分布，以及各轴车辆的实际超载运输比例；根据疲劳等效原理计算了两个地区不同车道对应的疲劳车型并进行了对比。 2）根据影响线加载原理计算了两个地区不同车道实测车辆荷载作用下中小跨径简支梁的内力分布，分析了各跨径简支梁内力超限情况；采用Rice公式对设计基准期各跨径简支梁的汽车荷载效应极值进行外推，研究了汽车荷载效应极值与设计汽车荷载效应之比随简支梁跨径的分布情况；讨论了不同车道汽车荷载效应之间的差异。 3）采用CA交通流模型模拟了大跨径桥梁在不同车型比例、不同交通流密度下的汽车荷载，分析了影响大跨径桥梁汽车荷载量值的主要交通流参数；模拟不同地区交通流处于密集或堵塞运行状态时，大跨径桥梁不同加载长度对应的汽车荷载分布情况，，并与设计汽车荷载进行了对比。
[Abstract]:For medium and small span bridge structures, heavy vehicles in traffic and transportation play a decisive role in vehicle load, while for long span bridge structures, the factors that affect the vehicle load value also include vehicle model ratio, traffic flow running state and so on. Based on the long-term measured data of vehicle loads in two areas of China, the characteristics of traffic flow parameters in two regions are analyzed, and the distribution of internal forces of small and medium span simply supported beams under vehicle loads in two regions are calculated. The CA traffic flow model is introduced to discuss the main traffic flow parameters which affect the vehicle load value of long span bridge. The following tasks have been completed: 1) according to the measured vehicle load data of 104 National Highway for 30 days and Xuanda Expressway for 180 days, this paper compares and analyzes the proportion of vehicle types in different driveways, the distribution of vehicle weight speed and the actual overloading ratio of each axle vehicle in two areas; According to the fatigue equivalent principle, the fatigue models corresponding to different lanes in two areas are calculated and compared. 2) according to the influence line loading principle, the internal force distribution of the small and medium span simply supported beam under the action of vehicle load in two different driveways is calculated, and the situation of the internal force exceeding the limit of each span simply supported beam is analyzed. The Rice formula is used to extrapolate the extreme value of the vehicle load effect of each span simply supported beam in the design reference period, and the distribution of the ratio of the vehicle load effect extreme value to the design automobile load effect with the span of the simply supported beam is studied. The difference of vehicle load effect in different lanes is discussed. 3) the CA traffic flow model is used to simulate the vehicle load of long span bridge under different vehicle types and different traffic density, and the main traffic flow parameters which affect the vehicle load value of long span bridge are analyzed. The distribution of vehicle loads corresponding to different loading lengths of long-span bridges is simulated when the traffic flow in different areas is in dense or clogged conditions and compared with the designed vehicle loads.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.14;U441.2

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