本文選題：公路橋梁 + 汽車荷載��； 參考：《長安大學》2014年碩士論文

【摘要】：對于中小跨徑橋梁結(jié)構(gòu)，交通運輸中的重型車輛對其汽車荷載起決定作用；對于大跨徑橋梁結(jié)構(gòu)，影響其汽車荷載量值的因素還包括車型比例、交通流的運行狀態(tài)等。本文根據(jù)國內(nèi)兩個地區(qū)的車輛荷載長期實測數(shù)據(jù)，分析了兩個地區(qū)的交通流參數(shù)特征；計算了兩個地區(qū)實測車輛荷載作用下中小跨徑簡支梁的內(nèi)力分布，并與設(shè)計汽車荷載效應進行對比；引入CA交通流模型對影響大跨徑橋梁汽車荷載量值的主要交通流參數(shù)進行了討論。主要完成了以下工作： 1）根據(jù)104國道為期30天、宣大高速為期180天的實測車輛荷載數(shù)據(jù)，對比分析了兩個地區(qū)不同車道各車型的占有比例、車重車速分布，以及各軸車輛的實際超載運輸比例；根據(jù)疲勞等效原理計算了兩個地區(qū)不同車道對應的疲勞車型并進行了對比。 2）根據(jù)影響線加載原理計算了兩個地區(qū)不同車道實測車輛荷載作用下中小跨徑簡支梁的內(nèi)力分布，分析了各跨徑簡支梁內(nèi)力超限情況；采用Rice公式對設(shè)計基準期各跨徑簡支梁的汽車荷載效應極值進行外推，研究了汽車荷載效應極值與設(shè)計汽車荷載效應之比隨簡支梁跨徑的分布情況；討論了不同車道汽車荷載效應之間的差異。 3）采用CA交通流模型模擬了大跨徑橋梁在不同車型比例、不同交通流密度下的汽車荷載，分析了影響大跨徑橋梁汽車荷載量值的主要交通流參數(shù)；模擬不同地區(qū)交通流處于密集或堵塞運行狀態(tài)時，大跨徑橋梁不同加載長度對應的汽車荷載分布情況，，并與設(shè)計汽車荷載進行了對比。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.14;U441.2

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