貨運繁重公路的車輛荷載譜和疲勞車輛模型
[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.
【作者單位】: 湖南大學(xué)土木工程學(xué)院;
【基金】:國家自然科學(xué)基金項目(51278191) 國家973計劃項目(2015CB057701,2015CB057702) 湖南省交通科技項目(201522)
【分類號】:U441.2
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