本文選題：高速鐵路　切入點(diǎn)：無碴軌道橋梁　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：高速鐵路橋梁建設(shè)以來,部分大跨度橋梁由于梁端變形過大而導(dǎo)致梁端軌道受力超過安全限值,影響了軌道結(jié)構(gòu)使用的安全性和耐久性。目前主要通過增設(shè)過渡板結(jié)構(gòu)降低軌道受力,何種參數(shù)的過渡板結(jié)構(gòu)能夠最大限度地改善軌道受力、設(shè)置過渡板結(jié)構(gòu)后又能否保證列車的平穩(wěn)舒適運(yùn)行,這是設(shè)計(jì)時(shí)必須考慮的問題。本文基于靜、動(dòng)力計(jì)算結(jié)果對(duì)過渡板結(jié)構(gòu)的合理參數(shù)取值進(jìn)行了研究。主要研究內(nèi)容與成果如下： (1)論述了過渡板結(jié)構(gòu)的作用機(jī)理,定性說明了過渡板結(jié)構(gòu)能夠改善由梁端變形引起的扣件受力。 (2)以32m簡支梁的梁端變形模擬大跨度連續(xù)剛構(gòu)橋的梁端變形,建立了32m簡支梁Ansys靜力計(jì)算模型,分析了過渡板結(jié)構(gòu)對(duì)軌道受力的改善效果得出：當(dāng)過渡板長度為2.5m時(shí),在梁端錯(cuò)臺(tái)單獨(dú)作用下,扣件下壓力和鋼軌應(yīng)力改善效果最好；梁端轉(zhuǎn)角和錯(cuò)臺(tái)共同作用下,扣件上拔力和軌道板穩(wěn)定性改善效果最為顯著。當(dāng)在梁端錯(cuò)臺(tái)在0.5mm～3.0mm之間時(shí),扣件最大下壓力和鋼軌最大應(yīng)力分別可減小85%～87%和70%-72%；當(dāng)在梁端轉(zhuǎn)角和錯(cuò)臺(tái)在0.5%orad和0.5mm～2.0%orad和2.0mm之間時(shí),扣件最大上拔力可減小83%-90%,軌道板最小穩(wěn)定系數(shù)的增幅為379%-490%。 (3)建立了大跨度連續(xù)剛構(gòu)橋動(dòng)力計(jì)算模型,編制了Fortran程序,運(yùn)用該程序探究了過渡板結(jié)構(gòu)對(duì)行車平穩(wěn)性和舒適性的影響。增設(shè)過渡板前、后,車體動(dòng)力響應(yīng)僅當(dāng)車輛通過過渡板時(shí)有所差異,車體豎向最大加速度改變較大,Sperling指標(biāo)改變較小。 (4)基于靜、動(dòng)力計(jì)算結(jié)果提出了大跨度連續(xù)剛構(gòu)橋過渡板結(jié)構(gòu)合理參數(shù)取值范圍：過渡板結(jié)構(gòu)長度控制在1.3m～2.5m之間,過渡板抗彎慣性矩宜不小于6.4×10-4m4,過渡板上扣件的靜剛度宜取在20kN/mm～40kN/mm之間,過渡板上扣件的間距宜取為600mm～629mm,過渡板板端扣件到支座的距離宜取為300mm～400mm。圖87幅,表27
[Abstract]:Absrtact: since the construction of high-speed railway bridges, some long-span bridges have exceeded the safety limit due to the excessive deformation at the end of the beam. The safety and durability of track structure are affected. At present, the load of track is reduced by adding transition plate structure. It is necessary to consider whether the train can run smoothly and comfortably after setting up the transition plate structure. The results of dynamic calculation are used to study the reasonable parameters of the transition plate structure. The main contents and results are as follows:. 1) the mechanism of the transition plate structure is discussed, and the effect of the transition plate structure on the force of the fastener caused by the deformation of the beam end is explained qualitatively. In this paper, the Ansys static calculation model of 32m simply supported beam is established by simulating the beam end deformation of the long-span continuous rigid frame bridge with the beam end deformation of 32m simply supported beam, and the improvement effect of the transition plate structure on the track stress is analyzed. The results show that when the length of the transition plate is 2.5m, Under the single action of staggered beam, the improvement effect of buckle pressure and rail stress is the best. Under the joint action of angle of beam end and staggered platform, the improvement effect of pull force on fastener and stability of rail plate is most remarkable. When the staggered beam end is between 0.5 mm and 3.0 mm, The maximum downward pressure of fastener and the maximum stress of rail can be reduced by 850.87% and 70-72, respectively. When the angle at the end of the beam and the stagger are between 0.5orad and 0.5mm, the maximum pull-up force of the fastener can be reduced by 83-90, and the minimum stability coefficient of the track plate increases by 379-490mm. The dynamic calculation model of long-span continuous rigid frame bridge is established, and the Fortran program is compiled. By using the program, the influence of transition plate structure on ride stability and comfort is explored. The dynamic response of the car body is different only when the vehicle passes through the transition plate, and the maximum vertical acceleration of the car body changes greatly and the change of Sperling index is small. 4) based on the static and dynamic calculation results, the reasonable parameter range of the transition plate structure of the long-span continuous rigid frame bridge is proposed. The length of the transition plate structure is controlled between 1.3 m and 2.5 m. The bending moment of inertia of transition plate should be not less than 6.4 脳 10 ~ (-4) mm, the static stiffness of fastener should be between 20kN / mm and 40kN / mm, the distance of fastener should be 600mm / 629mm, the distance between end fastener and support should be 300mm / 400mm.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U448.13

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