【摘要】：車(chē)輛動(dòng)荷載是道路承受的主要荷載,道路因長(zhǎng)期承受車(chē)輛荷載會(huì)出現(xiàn)破損和破壞。近年來(lái),隨著交通需求的增長(zhǎng),重載車(chē)輛增多,路面承受的振動(dòng)荷載也越來(lái)越大,同時(shí)路面結(jié)構(gòu)并不是承受理想的靜載。所以本文模擬路面實(shí)際的加載狀態(tài),對(duì)動(dòng)荷載作用下瀝青路面各層的動(dòng)態(tài)響應(yīng)進(jìn)行研究。車(chē)輛行駛的過(guò)程,實(shí)質(zhì)上是車(chē)、路相互影響作用的過(guò)程。以正弦波路面函數(shù)描述路面不平整狀況,建立1/4車(chē)輛動(dòng)荷載模型,利用MATLAB軟件分析車(chē)輛行駛速度、輪胎阻尼剛度和車(chē)輛參數(shù)對(duì)動(dòng)載系數(shù)的影響,針對(duì)車(chē)輛荷載狀況的不同,分析得出在空載、半載、滿(mǎn)載以及不同超載率下,車(chē)輛動(dòng)荷載的變化規(guī)律�；诙鄬訌椥泽w系,將瀝青路面結(jié)構(gòu)分為面層、基層、底基層和土基,利用ANSYS有限元軟件建立三維路面結(jié)構(gòu)模型,研究了半波正弦荷載作用下路面結(jié)構(gòu)的動(dòng)態(tài)響應(yīng)(主要包括動(dòng)位移、動(dòng)應(yīng)力、動(dòng)應(yīng)變),并對(duì)比了靜載作用下路面所受應(yīng)力的差異。結(jié)果表明動(dòng)載作用下,路面彎沉小于靜載作用,層底拉應(yīng)力、壓應(yīng)力略大于靜載;因此,在當(dāng)前的路面設(shè)計(jì)中,控制靜載下的路面彎沉是偏于保守及安全的,但以其控制層底拉應(yīng)力是偏小的,不能確切反映路面在動(dòng)載下的受力狀態(tài)。
[Abstract]:Vehicle dynamic load is the main load on the road, and the road will be damaged and destroyed because of the long-term vehicle load. In recent years, with the increase of traffic demand, the number of heavy load vehicles increases, and the vibration load on the pavement is also increasing. At the same time, the pavement structure is not subjected to ideal static load. Therefore, this paper simulates the actual loading state of asphalt pavement, and studies the dynamic response of each layer of asphalt pavement under dynamic load. The process of vehicle driving is essentially the process of interaction between vehicle and road. The sine wave pavement function is used to describe the uneven condition of the pavement, and the dynamic load model of 1 / 4 vehicle is established. The effects of vehicle speed, tire damping stiffness and vehicle parameters on the dynamic load coefficient are analyzed by MATLAB software. According to the different load conditions of the vehicle, the influence of vehicle speed, tire damping stiffness and vehicle parameters on the dynamic load coefficient is analyzed. The variation law of vehicle dynamic load under no load, half load, full load and different overload rate is analyzed. Based on the multi-layer elastic system, the asphalt pavement structure is divided into surface layer, base, subbase and soil foundation, and the three-dimensional pavement structure model is established by using ANSYS finite element software. The dynamic response of pavement structure under half-wave sinusoidal load (including dynamic displacement, dynamic stress, dynamic strain) is studied, and the difference of stress on pavement under static load is compared. The results show that the deflection of pavement under dynamic load is smaller than that under static load, and the tensile stress and compressive stress at the bottom of the layer are slightly higher than those under static load. Therefore, in the current pavement design, the pavement deflection under static load control is conservative and safe, but the tensile stress at the bottom of the control layer is small, which can not accurately reflect the stress state of the pavement under dynamic load.
【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(lèi)號(hào)】：U416.217

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本文編號(hào)：2483670