本文關(guān)鍵詞：復(fù)雜行駛工況下考慮瀝青路面變溫粘彈性的動(dòng)態(tài)軸載換算　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 動(dòng)態(tài)軸載換算 動(dòng)荷載 溫度場(chǎng) 輪胎-路面 數(shù)值仿真

【摘要】：現(xiàn)有的瀝青路面結(jié)構(gòu)設(shè)計(jì)將車輛荷載假定為雙圓均布靜態(tài)荷載,忽略了車輛荷載的動(dòng)態(tài)行為和瀝青混凝土的粘彈性特征�，F(xiàn)行的城鎮(zhèn)道路設(shè)計(jì)規(guī)范雖然將瀝青層剪應(yīng)力作為設(shè)計(jì)指標(biāo),但仍借用公路設(shè)計(jì)規(guī)范中瀝青路面彎沉和層底彎拉應(yīng)力的軸載換算公式,這種方法存在不足。因此,本文建立了剛性基層瀝青路面三維數(shù)值模型,考慮路面溫度場(chǎng)對(duì)瀝青混凝土粘彈性參數(shù)的影響,研究移動(dòng)荷載對(duì)瀝青路面動(dòng)力學(xué)響應(yīng)的影響,根據(jù)彎拉應(yīng)力和剪應(yīng)力指標(biāo)分別提出了相應(yīng)的動(dòng)態(tài)軸載換算公式。首先,基于二維Lamb問(wèn)題對(duì)數(shù)值仿真的有效性進(jìn)行驗(yàn)證,并對(duì)阻尼參數(shù)的設(shè)定做了比選。建立雙圓均布移動(dòng)荷載作用下的剛性基層瀝青路面數(shù)值模型,綜合分析了荷載移動(dòng)速度、路面摩擦系數(shù)和軸載對(duì)路面結(jié)構(gòu)動(dòng)力響應(yīng)的影響,獲得以瀝青層底彎拉應(yīng)力為指標(biāo)并考慮路面摩擦系數(shù)的動(dòng)態(tài)軸載換算公式。其次,進(jìn)行瀝青路面溫度場(chǎng)仿真的有效性驗(yàn)證。開(kāi)展剛性基層瀝青路面的溫度測(cè)量實(shí)驗(yàn),并建立相同工況的數(shù)值模型進(jìn)行溫度場(chǎng)仿真,使用檢測(cè)數(shù)據(jù)對(duì)仿真結(jié)果進(jìn)行了驗(yàn)證,證明了數(shù)值分析方法有效可行,計(jì)算結(jié)果可以為第五章進(jìn)行瀝青材料變溫粘彈性分析提供有效的溫度場(chǎng)數(shù)據(jù)。再次,建立輪胎-路面結(jié)構(gòu)的三維數(shù)值模型。由于輪胎結(jié)構(gòu)十分復(fù)雜,所以本文對(duì)輪胎結(jié)構(gòu)進(jìn)行了適當(dāng)簡(jiǎn)化,并利用Hypermesh和AutoCAD軟件建立子午線輪胎的三維模型。結(jié)合溫度場(chǎng)仿真數(shù)據(jù),通過(guò)VUMAT用戶子程序?qū)⒙访娼Y(jié)構(gòu)的瀝青混凝土粘彈性參數(shù)定義為溫度的函數(shù),將輪胎模型導(dǎo)入ABAQUS中與路面結(jié)構(gòu)組成輪胎-路面三維數(shù)值模型。最后,車輛分別采用不同的加速度和減速度,進(jìn)行非勻速移動(dòng)荷載作用下瀝青路面的動(dòng)力響應(yīng)分析。結(jié)合交叉口車輛啟動(dòng)和制動(dòng)車速實(shí)驗(yàn),在考慮瀝青混凝土變溫粘彈性的情況下進(jìn)行瀝青路面動(dòng)力響應(yīng)數(shù)值分析,根據(jù)計(jì)算結(jié)果提出基于剛性基層瀝青路面瀝青層剪應(yīng)力的動(dòng)態(tài)軸載換算公式,彌補(bǔ)了當(dāng)前城鎮(zhèn)道路設(shè)計(jì)規(guī)范未單獨(dú)提出以瀝青層剪應(yīng)力進(jìn)行軸載換算的不足。
[Abstract]:The existing asphalt pavement structure design assumes the vehicle load as double circular uniform static load. The dynamic behavior of vehicle load and the viscoelastic characteristics of asphalt concrete are ignored. Although the shear stress of asphalt layer is taken as the design index in the current design code for urban roads. However, the axial load conversion formula of asphalt pavement deflection and bottom bending stress is still used in the highway design code. This method has some shortcomings. Therefore, a three-dimensional numerical model of rigid base asphalt pavement is established in this paper. Considering the influence of pavement temperature field on the viscoelastic parameters of asphalt concrete, the effect of moving load on the dynamic response of asphalt pavement is studied. According to the flexural stress and shear stress index, the corresponding dynamic axial load conversion formulas are proposed. Firstly, the validity of the numerical simulation is verified based on the two-dimensional Lamb problem. The numerical model of rigid base asphalt pavement under the action of double circular uniform moving load is established, and the load moving speed is analyzed synthetically. The influence of pavement friction coefficient and axle load on the dynamic response of pavement structure, the dynamic axial load conversion formula is obtained, which takes the bending and tensile stress of asphalt bottom as the index and considers the pavement friction coefficient. Secondly. The validity of temperature field simulation of asphalt pavement is verified. The temperature measurement experiment of asphalt pavement with rigid base is carried out, and the numerical model of the same working condition is established to simulate the temperature field. The simulation results are verified by the test data, and the results show that the numerical analysis method is effective and feasible. The calculated results can provide the effective temperature field data for the 5th chapter of the asphalt material variable temperature viscoelastic analysis. The three-dimensional numerical model of tire pavement structure is established. Because the tire structure is very complex, the tire structure is simplified in this paper. The three-dimensional model of radial tire is built by using Hypermesh and AutoCAD software, and the simulation data of temperature field are combined. The viscoelastic parameters of asphalt concrete of pavement structure are defined as a function of temperature by VUMAT user subroutine. The tire model is introduced into ABAQUS to form a three-dimensional numerical model of tire and road surface. Finally, the vehicle adopts different acceleration and deceleration. The dynamic response of asphalt pavement under non-uniform moving load is analyzed. Considering the variable temperature viscoelasticity of asphalt concrete, the dynamic response of asphalt pavement is analyzed numerically. Based on the calculation results, the dynamic axial load conversion formula based on the shear stress of asphalt layer of rigid base asphalt pavement is proposed. It makes up for the deficiency that the shearing stress of asphalt layer is not used separately in the current urban road design code.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.217

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相關(guān)博士學(xué)位論文 前1條

1 銀花;基于分?jǐn)?shù)導(dǎo)數(shù)粘彈性理論的車輛—路面作用研究[D];南京林業(yè)大學(xué);2010年

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本文編號(hào)：1421966