【摘要】：水泥混凝土路面是我國高等級(jí)公路路面結(jié)構(gòu)的主要形式之一。隨著我國綜合國力的進(jìn)一步增強(qiáng),基礎(chǔ)建設(shè)取得新的成就,交通運(yùn)輸業(yè)迅猛發(fā)展。同時(shí)我國交通現(xiàn)狀中也存在著不少問題。其一,我國現(xiàn)行規(guī)范對(duì)路面各項(xiàng)指標(biāo)的規(guī)定均采用靜態(tài)荷載,而實(shí)際情況中,車輛以一定速度行駛在路面上,對(duì)路面施加的動(dòng)荷載是大小和作用位置都隨時(shí)間變化的隨機(jī)荷載,路面實(shí)際受力狀態(tài)與在靜態(tài)荷載下得到的水泥路面受力特性存在一定差別。其二,在運(yùn)輸車輛中,重型車及超重型車在公路運(yùn)輸中所占比重越來越高,車輛超限、超載問題日益突出,造成水泥混凝土路面早期破壞現(xiàn)象嚴(yán)重。所以對(duì)重載交通路面結(jié)構(gòu)進(jìn)行動(dòng)力學(xué)分析有重要的理論意義和應(yīng)用價(jià)值。本文針對(duì)重載交通的特征,在總結(jié)國內(nèi)外研究成果的基礎(chǔ)上,應(yīng)用有限元分析理論,將水泥混凝土路面結(jié)構(gòu)模擬為彈性層狀體系,借助ANSYS軟件建立的三維有限元分析模型,將車輛荷載模擬為穩(wěn)態(tài)正弦移動(dòng)荷載,在不同超載率下,對(duì)水泥混凝土路面在勻速狀態(tài),以及考慮水平荷載作用的加速狀態(tài)、制動(dòng)減速狀態(tài)下的路面結(jié)構(gòu)力學(xué)響應(yīng)進(jìn)行分析,得出荷載作用下路面各結(jié)構(gòu)層彎沉、縱向應(yīng)力、垂直壓應(yīng)力以及水平剪應(yīng)力的時(shí)間歷程曲線,并通過對(duì)計(jì)算結(jié)果進(jìn)行比較確定不同行駛狀態(tài)下,超載對(duì)加速路面損傷的影響規(guī)律。分析結(jié)果表明,水泥混凝土路面在路表取得最大彎沉值、最大縱向壓應(yīng)力、最大垂直壓應(yīng)力以及最大水平剪應(yīng)力,在路面板底取得最大縱向拉應(yīng)力。并且隨著超載率的增加,路面結(jié)構(gòu)應(yīng)力和彎沉均隨之增大�？梢�,重載道路載貨汽車的超載現(xiàn)象是造成路面結(jié)構(gòu)破壞的重要原因。
[Abstract]:Cement concrete pavement is one of the main forms of high-grade highway pavement structure in China. With the further enhancement of China's comprehensive national strength, new achievements have been made in infrastructure construction and the transportation industry has developed rapidly. At the same time, there are many problems in the present traffic situation in our country. First, the current code of our country all adopt static load to every index of road surface, but in practice, the vehicle travels on the pavement at a certain speed, and the dynamic load imposed on the road surface is a random load that changes in size and action position with time. There is a certain difference between the actual loading state of pavement and the mechanical characteristics of cement pavement under static load. Second, in the transportation vehicles, heavy vehicles and super heavy vehicles account for more and more high proportion in the road transportation. The overload problem of the vehicles is becoming more and more serious, which results in the serious early damage phenomenon of cement concrete pavement. Therefore, the dynamic analysis of heavy-haul traffic pavement structure has important theoretical significance and application value. In this paper, according to the characteristics of heavy haul traffic, on the basis of summarizing the research results at home and abroad, applying the theory of finite element analysis, the structure of cement concrete pavement is simulated as an elastic layered system, and the three-dimensional finite element analysis model is established by means of ANSYS software. The vehicle load is simulated as a steady sinusoidal moving load. Under different overloading rates, the mechanical response of pavement structure under the condition of uniform speed and acceleration under horizontal load and braking and deceleration is analyzed. The time history curves of deflection, longitudinal stress, vertical compressive stress and horizontal shear stress are obtained under load, and the calculated results are compared to determine the different driving states. The influence of overload on accelerated pavement damage. The results show that the maximum deflection value, the maximum longitudinal compressive stress, the maximum vertical compressive stress and the maximum horizontal shear stress of the cement concrete pavement are obtained on the pavement surface, and the maximum longitudinal tensile stress is obtained at the bottom of the pavement slab. And with the increase of overload ratio, the stress and deflection of pavement structure increase. It can be seen that overloading of heavy-haul road vehicles is an important cause of pavement structure damage.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.216

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相關(guān)期刊論文 前1條

1 周華飛,蔣建群,毛根海;路面不平整引起的車輛動(dòng)荷載分析[J];中國市政工程;2002年03期

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本文編號(hào)：2227475