典型高速公路實際運行車輛荷載模型研究
發(fā)布時間：2018-09-12 18:23
【摘要】：汽車活載和疲勞荷載是公路橋梁車輛荷載中最重要的兩種荷載。一方面,我國幅員遼闊,各地區(qū)發(fā)展不平衡導(dǎo)致不同地區(qū)間車輛荷載模型存在顯著差異；另一方面,既有橋梁實際運行車輛荷載可能和設(shè)計荷載有很大差別。因此本研究主要基于動態(tài)稱重(WIM)系統(tǒng)實測數(shù)據(jù)進(jìn)行公路橋梁實際運行汽車活載模型和疲勞荷載模型的研究。主要進(jìn)行的工作如下：(1)本文以京滬高速新沂河大橋為工程背景,基于1500萬輛左右WIM系統(tǒng)實測數(shù)據(jù),統(tǒng)計分析各車輛參數(shù)的分布特征。繼而,運用規(guī)范方法建立包括新沂河大橋在內(nèi)的六種橋型在正常運行狀態(tài)下的汽車活載模型。(2)同樣以新沂河大橋為工程背景,基于平衡更新過程理論計算并道和擁堵運行狀態(tài)下汽車活載模型。(3)以沿海高速灌河大橋為工程背景,對比分析國內(nèi)外公路橋梁規(guī)范中疲勞荷載模型的模式和取值。在統(tǒng)計分析WIM系統(tǒng)實測數(shù)據(jù)中車輛參數(shù)的基礎(chǔ)上,計算實際運行車輛疲勞荷載譜和標(biāo)準(zhǔn)疲勞車,并以灌河大橋斜拉索的疲勞評估為目標(biāo),對比分析在所得多種疲勞荷載模型作用下的拉索疲勞作用。得到的主要結(jié)論如下：(1)新沂河大橋WIM系統(tǒng)長期監(jiān)測數(shù)據(jù)表明,從車輛數(shù)來看,夜間重型車較白天多,各季節(jié)差異明顯,整體數(shù)量是平穩(wěn)中略有增長；從車重上來看,重車比例從外側(cè)車道到內(nèi)側(cè)車道依次減少,且南行一側(cè)重車明顯較北行的多。新沂河大橋右幅實際運行汽車活載模型是公路-I級的1.4倍,左幅為1.22倍。(2)并道運行時,新沂河大橋左幅實際荷載為規(guī)范荷載的1.25倍,與正常運行相近；擁堵運行狀態(tài)下,右幅的荷載達(dá)到了公路-I級的2.1倍,左幅為1.8倍,相對于正常運行分別提高了0.7倍和0.6倍。(3)為灌河大橋建立三個車輛疲勞荷載模型：“疲勞荷載模型1”為由5種車型組成的車輛疲勞荷載譜；“疲勞荷載模型2”為一輛由6個軸組成的標(biāo)準(zhǔn)疲勞車；“疲勞荷載模型3”為直接應(yīng)用實測車輛數(shù)據(jù)。分別通過荷載模型1和3獲得的拉索疲勞作用結(jié)果非常相近,同時也都表明灌河大橋拉索具有較高的疲勞可靠性,而且基于疲勞荷載譜的計算結(jié)果更加保守。
[Abstract]:Vehicle live load and fatigue load are the two most important loads in highway bridge vehicle load. On the one hand, because of the vast territory of our country, the unbalanced development of different regions leads to significant differences in vehicle load models between different regions; on the other hand, the actual running vehicle loads of existing bridges may differ greatly from the design loads. Therefore, based on the measured data of dynamic weighing (WIM) system, this paper mainly studies the active load model and fatigue load model of highway bridge. The main works are as follows: (1) based on the measured data of about 15 million WIM system, the distribution characteristics of the parameters of each vehicle are statistically analyzed based on the background of Beijing-Shanghai Expressway Xinyi River Bridge. Then, six kinds of bridge models, including Xinyi River Bridge, are established by using the normative method. (2) the Xinyi River Bridge is also used as the engineering background. Based on the theory of equilibrium renewal process, the dynamic load model of vehicles under the condition of parallel road and congested operation is calculated. (3) taking the coastal high-speed Guanhe Bridge as the engineering background, the fatigue load models in the codes of highway bridges at home and abroad are compared and analyzed. Based on the statistical analysis of the vehicle parameters in the measured data of the WIM system, the fatigue load spectrum and the standard fatigue vehicle of the actual running vehicle are calculated, and the fatigue assessment of the stayed cables of the Guanhe Bridge is taken as the objective. The fatigue behavior of cables under various fatigue load models is analyzed. The main conclusions are as follows: (1) the long-term monitoring data of WIM system of Xinyi River Bridge show that, from the view of the number of vehicles, the number of heavy vehicles at night is more than that of the daytime, the difference between seasons is obvious, the overall number of vehicles is slightly increased steadily, and from the point of view of vehicle weight, The proportion of heavy vehicles decreased from the outside lane to the inside lane, and the southbound one focused on the vehicle more than the northbound. The actual running model of the right side of Xinyi River Bridge is 1.4 times that of highway class I and 1.22 times of that of the left. (2) the actual load on the left side of Xinyi River Bridge is 1.25 times of the normal load, which is close to that of normal operation under the condition of congested operation, (2) the actual load on the left side of Xinyi River Bridge is 1.25 times that of the normal load. The load on the right side is 2.1 times that of the highway class I, and on the left is 1.8 times. Compared with normal operation, it increases 0.7 times and 0.6 times respectively. (3) three vehicle fatigue load models are established for Guanhe Bridge: "fatigue load model 1" is composed of five types of vehicle fatigue load spectrum; "fatigue load model 2" is a standard fatigue vehicle composed of six axes, and "fatigue load model 3" is the vehicle data directly applied. The results obtained from load models 1 and 3 are very similar, which also show that the cable of Guanhe Bridge has high fatigue reliability and the calculation results based on fatigue load spectrum are more conservative.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.2
本文編號：2239862
[Abstract]:Vehicle live load and fatigue load are the two most important loads in highway bridge vehicle load. On the one hand, because of the vast territory of our country, the unbalanced development of different regions leads to significant differences in vehicle load models between different regions; on the other hand, the actual running vehicle loads of existing bridges may differ greatly from the design loads. Therefore, based on the measured data of dynamic weighing (WIM) system, this paper mainly studies the active load model and fatigue load model of highway bridge. The main works are as follows: (1) based on the measured data of about 15 million WIM system, the distribution characteristics of the parameters of each vehicle are statistically analyzed based on the background of Beijing-Shanghai Expressway Xinyi River Bridge. Then, six kinds of bridge models, including Xinyi River Bridge, are established by using the normative method. (2) the Xinyi River Bridge is also used as the engineering background. Based on the theory of equilibrium renewal process, the dynamic load model of vehicles under the condition of parallel road and congested operation is calculated. (3) taking the coastal high-speed Guanhe Bridge as the engineering background, the fatigue load models in the codes of highway bridges at home and abroad are compared and analyzed. Based on the statistical analysis of the vehicle parameters in the measured data of the WIM system, the fatigue load spectrum and the standard fatigue vehicle of the actual running vehicle are calculated, and the fatigue assessment of the stayed cables of the Guanhe Bridge is taken as the objective. The fatigue behavior of cables under various fatigue load models is analyzed. The main conclusions are as follows: (1) the long-term monitoring data of WIM system of Xinyi River Bridge show that, from the view of the number of vehicles, the number of heavy vehicles at night is more than that of the daytime, the difference between seasons is obvious, the overall number of vehicles is slightly increased steadily, and from the point of view of vehicle weight, The proportion of heavy vehicles decreased from the outside lane to the inside lane, and the southbound one focused on the vehicle more than the northbound. The actual running model of the right side of Xinyi River Bridge is 1.4 times that of highway class I and 1.22 times of that of the left. (2) the actual load on the left side of Xinyi River Bridge is 1.25 times of the normal load, which is close to that of normal operation under the condition of congested operation, (2) the actual load on the left side of Xinyi River Bridge is 1.25 times that of the normal load. The load on the right side is 2.1 times that of the highway class I, and on the left is 1.8 times. Compared with normal operation, it increases 0.7 times and 0.6 times respectively. (3) three vehicle fatigue load models are established for Guanhe Bridge: "fatigue load model 1" is composed of five types of vehicle fatigue load spectrum; "fatigue load model 2" is a standard fatigue vehicle composed of six axes, and "fatigue load model 3" is the vehicle data directly applied. The results obtained from load models 1 and 3 are very similar, which also show that the cable of Guanhe Bridge has high fatigue reliability and the calculation results based on fatigue load spectrum are more conservative.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.2
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