本文選題：橋梁工程 + 重載交通��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：汽車荷載是公路橋梁建成后的主要運營荷載。隨著我國各地交通量和車載噸位的不斷攀升,橋梁結(jié)構(gòu)遭遇重載車輛及車輛超載的危害日益突出,因此關(guān)于重載交通對橋梁的荷載作用研究尤為重要。目前關(guān)于車輛荷載的研究還很不充分,本文專門對重載公路貨運通道車輛荷載進行研究。主要研究內(nèi)容如下： 本文首先介紹了各國公路橋梁規(guī)范對汽車荷載的規(guī)定,并將各國規(guī)范中對汽車荷載的規(guī)定進行對比。對重載公路貨運通道典型路段進行實際車流量調(diào)查,對車型分布、車間距分布、車重等數(shù)據(jù)進行統(tǒng)計分析,并對車流量隨時間變化規(guī)律進行分析。根據(jù)車流量調(diào)查數(shù)據(jù)及相關(guān)規(guī)范建立一般運行狀態(tài)及密集運行狀態(tài)下的車輛荷載模型。選取常見跨徑簡支梁橋及連續(xù)梁橋建模,計算橋梁在實際車輛荷載作用下關(guān)鍵截面的作用效應(yīng),并與按規(guī)范加載計算的荷載效應(yīng)進行對比分析。計算結(jié)果表明,實際車輛加載作用效應(yīng)與按規(guī)范加載作用效應(yīng)比值隨橋梁跨度增大而增大。 為更好的表述實際車輛荷載對橋梁的作用效應(yīng),選取一座T型梁簡支橋,對其在幾種實際車輛運行狀態(tài)作用下進行承載能力極限狀態(tài)驗算及抗裂性驗算。計算結(jié)果表明,當橋梁多車道均有擁堵車輛時,橋梁的承載能力極限狀態(tài)驗算及抗裂性驗算均不滿足要求。 最后結(jié)合本文關(guān)于重載車輛的研究計算結(jié)果,建議適當提高重載地區(qū)貨運通道橋梁的荷載標準,采取措施盡量避免重載車輛在大跨度橋梁上的集中擁堵。
[Abstract]:The vehicle load is the main operating load after the highway bridge is built. With the increasing of traffic volume and vehicle tonnage, the damage of overloading and overloading of the bridge structure is becoming more and more serious, so it is very important to study the load effect of the heavy load traffic on the bridge. At present, the research on vehicle load is not enough. The main contents of this paper are as follows: firstly, this paper introduces the regulations of highway and bridge codes in various countries on vehicle loads, and compares them with those of other countries. The actual traffic flow of a typical section of heavy haul road freight corridor is investigated. The data of vehicle type distribution, vehicle spacing distribution and vehicle weight are statistically analyzed, and the variation law of vehicle flow with time is analyzed. Based on the traffic flow survey data and relevant specifications, the vehicle load models under general and dense operation conditions are established. The common span simply supported beam bridge and continuous beam bridge are selected to model, and the effect of key section of bridge under actual vehicle load is calculated, and compared with the load effect calculated in accordance with the code loading. The results show that the ratio of the actual vehicle loading effect to the actual vehicle loading effect increases with the span of the bridge. In order to better describe the effect of the actual vehicle load on the bridge, a T-beam simply supported bridge is selected. The ultimate state of bearing capacity and crack resistance of the vehicle are checked and calculated under the action of several actual vehicle running states. The results show that when there are congested vehicles in the multi-lane of the bridge, the checking calculation of the limit state of the bearing capacity of the bridge and the checking calculation of the anti-cracking capacity of the bridge do not meet the requirements. Finally, combined with the results of the research and calculation of the heavy-duty vehicle in this paper, It is suggested that the load standard of the freight corridor bridge in heavy load area should be raised appropriately and that measures should be taken to avoid the concentrated congestion of heavy load vehicles on the long span bridge as far as possible.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.2

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