【摘要】：為研究貨運(yùn)繁重公路的車輛荷載譜和疲勞車輛模型,基于佛山平勝大橋的動(dòng)態(tài)稱重系統(tǒng)采集的多時(shí)段車流數(shù)據(jù),歸類出了車輛荷載譜的10類代表車型,分析了代表車型的軸距、質(zhì)量、軸重和超載數(shù)據(jù),以及沿不同車道的車輛和軸重分布特性,提出了可用于鋼橋疲勞評(píng)估的車輛荷載譜;以疲勞加載率最大的六軸車輛為原型,基于疲勞損傷等效原則分別提出了橋梁?jiǎn)蜗蛑剌d車道的疲勞車輛模型和簡(jiǎn)化疲勞車輛模型。計(jì)算結(jié)果表明:平勝大橋呈現(xiàn)貨運(yùn)繁重公路的典型特征,車輛日均通行總量達(dá)到了45 065veh,約為《AASHTO LRFD》定義的日均通行量20 000veh的2.3倍;疲勞車輛在全部交通流中的比例為51.6%,為《AASHTO LRFD》定義的20.0%的2.6倍;貨車占疲勞車輛總數(shù)的45.2%,主要分布于重載車道,而且通行貨車超載比例占到相應(yīng)車型的30%~70%,最大超載貨車達(dá)到了132.5t;兩軸貨車超載率為29.0%,等效質(zhì)量達(dá)到17.5t,后軸等效軸重達(dá)到12.1t,因而不能忽略兩軸貨車的疲勞加載貢獻(xiàn)。對(duì)比《AASHTO LRFD》五軸標(biāo)準(zhǔn)疲勞車輛模型(前軸軸重為2.6t,中間雙聯(lián)軸和后面雙聯(lián)軸的單軸軸重均為5.4t)和簡(jiǎn)化標(biāo)準(zhǔn)疲勞車輛模型(前軸為2.6t,中軸和后軸均為10.8t),提出的六軸單向疲勞車輛模型總質(zhì)量為33.1t,前軸軸重為3.6t,中間雙聯(lián)軸和后面三聯(lián)軸的單軸軸重均為5.9t;簡(jiǎn)化單向疲勞車輛模型的前軸軸重為3.6t,中軸和后軸分別為11.8、17.7t;針對(duì)重載車道提出的六軸疲勞車輛模型總質(zhì)量達(dá)到了36.5t,前軸軸重為4.0t,聯(lián)軸中的單軸軸重均為6.5t;對(duì)應(yīng)的重載車道簡(jiǎn)化疲勞車模型的前軸軸重為4.0t,中軸和后軸軸重分別為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.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51278191) 國(guó)家973計(jì)劃項(xiàng)目(2015CB057701,2015CB057702) 湖南省交通科技項(xiàng)目(201522)
【分類號(hào)】：U441.2

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