本文選題：大跨度斜拉橋　切入點：行車舒適性　出處：《長沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：車輛行駛在橋梁之上,在車輛發(fā)動機、橋面不平整度等激勵下橋梁會發(fā)生振動現(xiàn)象,橋梁的振動效應(yīng)反作用于車輛系統(tǒng)致使其振動加劇,車輛移動荷載的加載效應(yīng)比靜荷載加載的效應(yīng)明顯,同時振動也會影響乘客的行車舒適性。大跨度斜拉橋作為現(xiàn)代橋梁跨越大、自重質(zhì)量小等優(yōu)點成為很多跨越江河的首選橋型之一,其剛度相對其它梁橋剛度要小,所以有必要對大跨度斜拉橋的車-橋耦合的振動響應(yīng)以及行車舒適性進行研究。本文從兩個方面對大跨度斜拉橋的車-橋耦合振動著手研究：第一以橋梁結(jié)構(gòu)作為研究對象,移動荷載的作用會對橋梁有一個放大作用效應(yīng),即沖擊作用效應(yīng),振動會導(dǎo)致橋梁結(jié)構(gòu)的安全性以及耐久性產(chǎn)生消極影響；第二以車輛為研究對象,在橋面不平整度、橋梁反作用于車輛的振動效應(yīng)等激勵會影響車體的各向(縱向、橫向、豎向)加速度,從而影響乘客的行車舒適性。本文研究內(nèi)容如下：(1)通過查閱文獻總結(jié)了國內(nèi)外的關(guān)于車-橋耦合振動研究,分別從鐵路橋梁、汽車橋梁等介紹了其研究方法以及兩者相應(yīng)的區(qū)別；(2)通過分析不同車輛模型(1/4車輛模型、1/2車輛模型、三維空間車輛模型)得到相應(yīng)的車輛振動微分方程,選擇三維空間(7自由度)車輛模型作為本文研究的車輛模型,同時通過有限元軟件建立了橋梁模型并且推導(dǎo)得到橋梁振動微分方程,最后根據(jù)橋梁系統(tǒng)以及車輛系統(tǒng)之間的相互關(guān)系(位移協(xié)調(diào)和作用力平衡)求解車-橋耦合振動方程；(3)通過不同參數(shù)(車速、車重、橋梁質(zhì)量、橋面不平整度、車輛懸架剛度、橋梁阻尼比)研究其振動響應(yīng)以及沖擊系數(shù),表明車速、車重、橋梁質(zhì)量、橋面不平整度參數(shù)對其影響較大,車輛懸架剛度、橋梁阻尼比參數(shù)相對影響小些,沖擊系數(shù)的大小不僅和規(guī)范規(guī)定的橋梁基頻有關(guān),而且還和荷載作用、以及橋面不平整度等參數(shù)有關(guān)；(4)根據(jù)Matlab編制的車-橋耦合振動軟件,計算了車體的各向(縱向、橫向、豎向)加速度,并以IS02631的加權(quán)加速度為行車舒適性評價標準,分析了車重、車速、橋面不平整度等參數(shù)對行車舒適性的影響,同時以良好行車舒適性的第二類型舒適度加速度為界限,計算車輛在不同橋面等級下的建議車速,為車輛過橋在車速方面提供一定的理論依據(jù)。
[Abstract]:The vehicle on the bridge, in the vehicle engine, the bridges of the whole bridge excitation will vibrate, the vibration effect of bridge vehicle system due to its effect on the vibration of vehicles moving load, load effect is more obvious than the effect of static load, the vibration will affect passengers riding comfort of long span. Cable-stayed bridge as a modern bridge, the advantages of small weight quality become a preferred type of crossing rivers, the stiffness of the beam relative to other Qiaogang would be small, so it is necessary for the long-span cable-stayed bridge vehicle bridge coupling of vibration response and driving comfort. Research on the coupled vibration of bridge this paper from the two aspects of the long-span cable-stayed bridge vehicle: the first to bridge structure as the research object, the effect of moving load will have a magnifying effect on the bridge, namely the impact effect, The vibration will lead to negative effect of bridge structure safety and durability; second in the vehicle as the research object, on the road roughness, bridge effect on the vehicle vibration excitation will affect body (longitudinal, transverse and vertical anisotropy) acceleration, thus affecting the riding comfort of passengers. The contents of this paper are as follows: (1) through the literature at home and abroad are summarized. The research on vehicle bridge coupled vibration, respectively from the railway bridge, vehicle bridge introduces its research methods and the difference between the corresponding two; (2) through the analysis of different vehicle model (1/4 1/2 vehicle model, vehicle model, vehicle model three-dimensional space vehicle) the vibration of the corresponding differential equation, choose the three-dimensional space (7 DOF) vehicle model as the vehicle model in this paper, the finite element software to establish the bridge model and derived the micro vibration of bridge The differential equation based on the relationship between bridge system and vehicle system (displacement and force balance equation for vehicle bridge coupling vibration); (3) through different parameters (speed, weight, quality of the bridge, bridge deck roughness, vehicle suspension stiffness, damping ratio of bridge) to study the vibration response and impact coefficient show, speed, weight, quality of the bridge, the roughness parameters have great influence on the vehicle, suspension stiffness, damping ratio of bridge parameters relatively low impact, the impact coefficient is not only the size and specification of the bridge based on frequency, and load, and the roughness parameters (; 4) according to the software Matlab for the vibration of vehicle bridge coupling, the calculated anisotropy (longitudinal, transverse, vertical acceleration, acceleration) and a weighted IS02631 for driving comfort evaluation standards, analysis of the vehicle weight, vehicle speed, road The influence of flatness and other parameters on driving comfort is also discussed. Based on the second types of comfort and acceleration of good driving comfort, the recommended speed of vehicles under different deck grades is calculated, which provides a theoretical basis for vehicle crossing and speed.

【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27
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本文編號：1608907