本文選題：仿真路面　切入點(diǎn)：車輛荷載　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：目前設(shè)計(jì)壽命為15年的高速公路瀝青路面,往往在通車后2~3年內(nèi)就出現(xiàn)了不同程度的早期破壞現(xiàn)象。出現(xiàn)該困境的原因是車輛行駛于不平整的路面上,受路面激勵(lì)的影響會(huì)產(chǎn)生隨機(jī)振動(dòng),使部分路面受力增大,導(dǎo)致路面平整度下降,而路面平整度惡化又會(huì)加劇車輛振動(dòng),使路面受到更大的作用力,行駛中的車輛荷載與平整度之間的關(guān)系,大大加速了路面破壞。而我國(guó)現(xiàn)行瀝青路面結(jié)構(gòu)設(shè)計(jì)中各車型軸載為靜態(tài)荷載,實(shí)際作用于路面上的車輛荷載具有一定的空間重復(fù)性和數(shù)值波動(dòng)性。設(shè)計(jì)與實(shí)際的偏差使設(shè)計(jì)的路面無法達(dá)到使用年限。從仿真路面高程入手,應(yīng)用濾波白噪聲法仿真出各個(gè)路面功率譜密度下的路面高程,并考慮路形影響,建立路面功率譜密度與國(guó)際平整度指數(shù)之間的關(guān)系。據(jù)此,仿真出各個(gè)平整度下的路面高程,經(jīng)驗(yàn)證仿真路面高程正確有效。將仿真路面高程作為考慮裝載影響的雙軸貨車半車動(dòng)力學(xué)模型的輸入,選取適當(dāng)?shù)姆抡媛访骈L(zhǎng)度和個(gè)數(shù),計(jì)算得到各個(gè)平整度、車速和軸載下的路面各點(diǎn)行駛中的車輛荷載,并對(duì)比分析了雙軸貨車半車系統(tǒng)模態(tài)和行駛中的車輛荷載幅頻特性。對(duì)不同平整度、車速和軸載作用下的車輛荷載波動(dòng)規(guī)律進(jìn)行了分析,得到了車輛以不同車速和軸載行駛于同一路面時(shí),行駛中的車輛荷載在路面同一位置具有空間可重復(fù)性的結(jié)論。還以行駛中的車輛荷載標(biāo)準(zhǔn)差作為代表值,得到了行駛中的車輛荷載各影響因素的規(guī)律和敏感性,其中平整度為首要影響因素,并確定了其分布特性和分布概率。結(jié)合實(shí)例分析行駛中的車輛荷載對(duì)瀝青路面結(jié)構(gòu)設(shè)計(jì)的影響,具體包括對(duì)路面使用壽命、設(shè)計(jì)彎沉值、各層層底拉應(yīng)力和瀝青路面平整度養(yǎng)護(hù)標(biāo)準(zhǔn)的影響。
[Abstract]:At present, asphalt pavement with a design life of 15 years often appears early damage phenomenon in different degree within 2 ~ 3 years after opening to traffic.The reason for this predicament is that the vehicles driving on uneven road surface will produce random vibration under the influence of the road surface excitation, which will increase the force on part of the road surface and cause the road surface smoothness to decrease, and the deterioration of the road surface smoothness will aggravate the vehicle vibration.The relationship between vehicle load and smoothness greatly accelerates the pavement damage.However, in the design of asphalt pavement structure in China, the axle load of each vehicle model is static load, and the vehicle load acting on the pavement has a certain spatial repeatability and numerical fluctuation.The deviation between design and practice makes the designed pavement unable to reach the service life.Based on the simulation of road height, the white noise filtering method is used to simulate the road height under the power spectral density of road surface, and the relationship between the power spectral density of road surface and the international smoothness index is established considering the influence of road shape.According to this, the pavement elevation under various smoothness is simulated, and it is proved that the simulated pavement elevation is correct and effective.Taking the simulated road height as the input of the dynamic model of the two-axle freight car considering the loading effect, selecting the appropriate simulation road surface length and number, the vehicle load at each point under the load, the speed and the vehicle load are calculated.The mode of half-vehicle system and the amplitude-frequency characteristics of vehicle load are compared and analyzed.The fluctuation law of vehicle load under the action of different smoothness, speed and axle load is analyzed, and the vehicle driving on the same road with different speed and axle load is obtained.The conclusion that the vehicle load in progress has spatial repeatability in the same position of road surface.Taking the vehicle load standard deviation as the representative value, the law and sensitivity of the factors affecting the vehicle load are obtained, in which the flatness is the primary factor, and the distribution characteristics and distribution probability are determined.The influence of vehicle load on asphalt pavement structure design is analyzed with examples, including the influence of pavement service life, design deflection value, layer bottom tensile stress and asphalt pavement smoothness maintenance standard.
【學(xué)位授予單位】：哈爾濱工業(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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本文編號(hào)：1707940