本文關(guān)鍵詞：復(fù)雜輪胎力作用下瀝青路面力學(xué)行為研究　出處：《北京交通大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 重載汽車 輪胎力 路面力學(xué)行為 有限元 路面病害

【摘要】：隨著我國(guó)經(jīng)濟(jì)的持續(xù)發(fā)展和地區(qū)間人貨交流數(shù)量的增加,公路運(yùn)輸正向快速和重型化發(fā)展,車輛的高速重載現(xiàn)象日益嚴(yán)重。結(jié)合這一背景,有針對(duì)性地開展重交通荷載作用下的瀝青路面力學(xué)行為研究,是道路工程學(xué)科和公路交通建設(shè)管理領(lǐng)域的迫切需求。在多數(shù)的路面力學(xué)行為研究中,輪胎力都被簡(jiǎn)化為靜態(tài)均布垂向荷載,不能很好地適應(yīng)重交通動(dòng)態(tài)荷載作用下瀝青路面設(shè)計(jì)與路表早期病害機(jī)理研究的特殊需求。將水平向輪胎力引入路面模型,以揭示復(fù)雜輪胎力作用下的路面力學(xué)行為,對(duì)于豐富和發(fā)展道路設(shè)計(jì)理論具有重要理論意義和工程應(yīng)用價(jià)值。本文以復(fù)雜輪胎力及其作用下的瀝青路面力學(xué)行為為對(duì)象,基于多體動(dòng)力學(xué)方法和有限元方法分別建立了車輛、輪胎和道路的仿真模型,結(jié)合我國(guó)公路運(yùn)輸中車輛和道路的典型工況,從車輛-道路相互作用系統(tǒng)的角度進(jìn)行了輪胎力和路面力學(xué)行為的研究,較全面地分析了車輛使用參數(shù)對(duì)輪胎力空間分布、路面動(dòng)力響應(yīng)及路面典型病害的影響。通過(guò)研究,得出以下主要結(jié)論:(1)輪胎接地壓力可表達(dá)為三個(gè)方向的分力,即垂向接觸力CPRESS、縱向摩擦力CSHEAR1、橫向摩擦力CSHEAR2。穩(wěn)態(tài)滾動(dòng)條件下,上述三向接觸力同時(shí)存在。輪胎處于自由滾動(dòng)狀態(tài)時(shí),CSHEAR1和CSHEAR2與CPRESS處于同一量級(jí)。輪胎大部分的工作狀態(tài)接近自由滾動(dòng),在進(jìn)行輪胎和路面力學(xué)響應(yīng)分析時(shí)不應(yīng)忽略CSHEAR1和CSHEAR2。在完全制動(dòng)和完全牽引狀態(tài)下,CSHEAR1是水平向輪胎力的主要成分,CSHEAR2可以忽略不計(jì)。(2)CSHEAR1和CSHEAR2對(duì)路面面層的力學(xué)行為產(chǎn)生顯著影響,尤其是增加了面層的等效應(yīng)力幅值和TDC早期裂紋的等效應(yīng)力強(qiáng)度因子,而半剛性材料層底的拉應(yīng)力極值由垂向輪胎力控制,不受水平向輪胎力影響。(3)不同的車輛使用條件將產(chǎn)生不同的輪胎力空間分布特征,控制負(fù)載、增大胎壓可有效改善輪胎的接地壓力分布;道路條件也對(duì)輪胎力產(chǎn)生重要影響,CSHEAR1對(duì)路面摩擦系數(shù)和縱坡較為敏感,CSHEAR2對(duì)道路橫坡較為敏感。(4)在高速公路運(yùn)輸中常見的參數(shù)條件下,貨車的車速、裝載率、胎壓和道路縱坡對(duì)道路的使用性能產(chǎn)生顯著的負(fù)面影響。低速、高胎壓、超載均是促進(jìn)車轍發(fā)生的直接原因;超載將加速TDC早期裂紋的擴(kuò)展,高胎壓則對(duì)裂紋的擴(kuò)展沒(méi)有顯著影響。(5)車輛前軸對(duì)車轍和TDC早期裂紋的影響不容忽視,多軸并裝車輛比單軸車輛更加容易導(dǎo)致車轍的發(fā)生。
[Abstract]:With the continuous development of our economy and the increase of the quantity of people and goods exchange between regions, highway transportation is developing rapidly and heavy-duty, and the phenomenon of high-speed and heavy load of vehicles is becoming more and more serious. It is an urgent need to study the mechanical behavior of asphalt pavement under heavy traffic load, which is an urgent need in the field of road engineering and highway traffic construction management. Tire forces are reduced to static uniform vertical loads. It can not meet the special needs of asphalt pavement design under heavy traffic dynamic load and the early disease mechanism of pavement surface. The horizontal tire force is introduced into the pavement model. In order to reveal the pavement mechanics behavior under the complex tire force action. It has important theoretical significance and engineering application value for enriching and developing road design theory. This paper takes the complex tire force and its mechanical behavior under the action of asphalt pavement as the object. Based on the multi-body dynamics method and the finite element method, the simulation models of vehicle, tire and road are established, and the typical conditions of vehicle and road in road transportation in China are combined. The tire force and pavement mechanical behavior are studied from the point of view of vehicle-road interaction system, and the spatial distribution of tire force caused by vehicle operating parameters is analyzed comprehensively. The main conclusions are as follows: 1) the earthing pressure of tire can be expressed in three directions, that is vertical contact force (CPRESS). Longitudinal friction CSHEAR1, transverse friction CSHEAR2. Under the steady rolling condition, the three directions contact force exists simultaneously. The tire is in the free rolling state. The CSHEAR1 and CSHEAR2 are of the same order of magnitude as the CPRESS. Most tyres are close to free rolling. CSHEAR1 and CSHEAR2 should not be ignored in the mechanical response analysis of tire and pavement. CSHEAR1 is the main component of horizontal tire force under the condition of complete braking and complete traction. CSHEAR2 can ignore that CSHEAR1 and CSHEAR2 have significant influence on the mechanical behavior of pavement surface. In particular, the equivalent stress amplitude of the surface layer and the equivalent stress intensity factor of the TDC early crack are increased, while the tensile stress extremum of the semi-rigid material bottom is controlled by the vertical tire force. Different vehicle use conditions will produce different tire force spatial distribution characteristics, control the load and increase the tire pressure can effectively improve the tire earthing pressure distribution. The road condition also has an important influence on the tire force. CSHEAR1 is more sensitive to the friction coefficient and longitudinal slope of the road surface. CSHEAR2 is more sensitive to the cross slope of the road. 4) under the condition of common parameters in the expressway transportation, the speed and loading rate of the truck. Tire pressure and longitudinal slope have a significant negative effect on the road performance. Low speed, high tire pressure and overload are the direct reasons to promote rutting. Overloading will accelerate the growth of early crack in TDC, while high tire pressure has no significant effect on crack propagation.) the influence of front axle of vehicle on rutting and early crack of TDC can not be ignored. Multi-axle mounted vehicles are more likely to cause rutting than single-axle vehicles.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：U416.217

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 王揚(yáng);王麗娟;路永婕;司春棣;;復(fù)雜移動(dòng)輪胎力作用下瀝青路面黏彈性力學(xué)行為模擬研究[J];振動(dòng)與沖擊;2017年15期

，

本文編號(hào)：1359857