货运繁重公路的车辆荷载谱和疲劳车辆模型

发布时间：2019-01-12 13:34

【摘要】：为研究货运繁重公路的车辆荷载谱和疲劳车辆模型,基于佛山平胜大桥的动态称重系统采集的多时段车流数据,归类出了车辆荷载谱的10类代表车型,分析了代表车型的轴距、质量、轴重和超载数据,以及沿不同车道的车辆和轴重分布特性,提出了可用于钢桥疲劳评估的车辆荷载谱;以疲劳加载率最大的六轴车辆为原型,基于疲劳损伤等效原则分别提出了桥梁单向重载车道的疲劳车辆模型和简化疲劳车辆模型。计算结果表明:平胜大桥呈现货运繁重公路的典型特征,车辆日均通行总量达到了45 065veh,约为《AASHTO LRFD》定义的日均通行量20 000veh的2.3倍;疲劳车辆在全部交通流中的比例为51.6%,为《AASHTO LRFD》定义的20.0%的2.6倍;货车占疲劳车辆总数的45.2%,主要分布于重载车道,而且通行货车超载比例占到相应车型的30%~70%,最大超载货车达到了132.5t;两轴货车超载率为29.0%,等效质量达到17.5t,后轴等效轴重达到12.1t,因而不能忽略两轴货车的疲劳加载贡献。对比《AASHTO LRFD》五轴标准疲劳车辆模型(前轴轴重为2.6t,中间双联轴和后面双联轴的单轴轴重均为5.4t)和简化标准疲劳车辆模型(前轴为2.6t,中轴和后轴均为10.8t),提出的六轴单向疲劳车辆模型总质量为33.1t,前轴轴重为3.6t,中间双联轴和后面三联轴的单轴轴重均为5.9t;简化单向疲劳车辆模型的前轴轴重为3.6t,中轴和后轴分别为11.8、17.7t;针对重载车道提出的六轴疲劳车辆模型总质量达到了36.5t,前轴轴重为4.0t,联轴中的单轴轴重均为6.5t;对应的重载车道简化疲劳车模型的前轴轴重为4.0t,中轴和后轴轴重分别为13.0、19.5t。
[Abstract]:In order to study the vehicle load spectrum and fatigue vehicle model of heavy-duty highway, based on the multi-period traffic flow data collected by the dynamic weighing system of Pingsheng Bridge in Foshan, 10 representative vehicle types of vehicle load spectrum are classified, and the wheelbase of representative vehicle model is analyzed. Mass, axle load and overload data, as well as the distribution characteristics of vehicle and axle load along different lanes, the vehicle load spectrum which can be used for fatigue assessment of steel bridge is proposed. Taking the six-axle vehicle with the highest fatigue loading rate as the prototype, the fatigue vehicle model and the simplified fatigue vehicle model of the one-way heavy-haul lane of the bridge are proposed based on the fatigue damage equivalence principle. The results show that Pingsheng Bridge has the typical characteristics of heavy freight highway, the average daily traffic volume of the vehicle reaches 45 065 veh, which is about 2. 3 times that of the average daily traffic volume of 20 000veh defined by < AASHTO LRFD >. The proportion of fatigue vehicles in the total traffic flow was 51.6, 2.6 times of the 20.0% defined by < AASHTO LRFD >; Freight cars account for 45.2% of the total number of fatigue vehicles, mainly distributed in heavy-haul lanes, and the proportion of overloaded trucks accounts for 300.70% of the corresponding models, and the maximum overloading truck reaches 132.5 t; The overloading rate of two-axle freight car is 29.0, the equivalent mass is 17.5 t, and the equivalent axle weight of rear axle is 12.1t, so the fatigue load contribution of two-axle freight car can not be ignored. Compared with the model of < AASHTO LRFD > five-axle standard fatigue vehicle (the load of front axle is 2.6 t, the load of single axle of middle and rear double coupling is 5.4 t), and the simplified model of standard fatigue vehicle is 2.6t for front axle, 10.8t for middle axle and rear axle. The total weight of the six-axis one-way fatigue vehicle model is 33.1 t, the load of the front axle is 3.6 t, and the load of the middle double axis and the rear triaxial is 5.9 t. The axle load of front axle, middle axle and rear axle of simplified one-way fatigue vehicle model is 3.6 t, 11.8 t and 17.7 t, respectively. The total mass of the six axle fatigue vehicle model for heavy haul lane is 36.5 t, the load of front axle is 4.0 t, and the load of single axle in coupling is 6.5 t. The weight of the front axle of the simplified fatigue vehicle model is 4.0 t, and the load of the middle axle and rear axle is 13.0 ~ 19.5t respectively.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金项目(51278191) 国家973计划项目(2015CB057701,2015CB057702) 湖南省交通科技项目(201522)
【分类号】：U441.2

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