本文關(guān)鍵詞：高速鐵路車橋耦合系統(tǒng)地震響應(yīng)分析　出處：《中國地震局工程力學研究所》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 高速鐵路 車橋耦合 自振特性 地震作用 軌道不平順 列車運行安全性指標 移動荷載模擬

【摘要】：隨著我國鐵路列車不斷提速、載重日益增大、橋梁在鐵路系統(tǒng)中的比重日益增高,研究列車與橋梁的動力相互作用已成為一個重要的課題。同時,在地震頻發(fā)的當下,高速鐵路地震報警系統(tǒng)及緊急處置系統(tǒng)已成為保障高鐵列車地震安全性的有效技術(shù)手段,而車橋耦合系統(tǒng)的地震響應(yīng)分析是了解高速鐵路車橋系統(tǒng)抗震性能的基礎(chǔ)性工作,也是高速鐵路地震報警系統(tǒng)閾值分析的必要環(huán)節(jié)和依據(jù)。在本文中,對車橋耦合系統(tǒng)的動力相互作用的國內(nèi)外研究現(xiàn)狀問題進行了歷史回顧和發(fā)展現(xiàn)狀的闡述,總結(jié)了已有的研究成果和經(jīng)驗,建立了車橋耦合系統(tǒng)地震反應(yīng)分析模型,較為全面地進行了地震作用下的車橋耦合振動研究。主要研究內(nèi)容包括： 1)詳細闡述了高速鐵路橋梁在地震作用下動力響應(yīng)問題研究的目的、意義、現(xiàn)狀以及存在的問題。 在以往的研究中,橋梁抗震與車橋耦合動力響應(yīng)分析是兩個獨立的研究課題,列車在橋上運行時同時受到地震荷載的概率的增大,使得車橋耦合系統(tǒng)的抗震研究和地震作用下列車在橋梁上的走行性安全研究成為了重要的研究課題。 2)基于現(xiàn)役高速鐵路橋梁的設(shè)計參數(shù),通過Midas-Civil軟件建立車橋耦合模型并進行動力特性分析。 在考慮列車的作用下,車橋耦合模型的自振頻率與橋梁固有頻率之間存在較大差異；通過改變車輛位置、橋梁墩高及跨度等參數(shù),得到了相應(yīng)的車橋耦合模型的自振特性變化規(guī)律。 3)進行了車橋耦合系統(tǒng)的地震響應(yīng)分析及列車運行安全性評估。 通過Midas有限元模型先對車橋耦合系統(tǒng)進行地震反應(yīng)分析,再以橋面響應(yīng)為輸入,加入軌道不平順數(shù)據(jù),計算列車的動力響應(yīng),并基于列車運行安全性指標對列車的安全性進行了評價。當改變列車運行速度與地震動加速度峰值,得到了列車運行三項安全性指標(脫軌系數(shù)、橫向輪軌力、輪重減載率)的相應(yīng)變化規(guī)律及安全限值。 4)采用有限元方法完成了快速移動列車荷載下橋梁結(jié)構(gòu)的動力響應(yīng)分析。 對列車靜荷載、列車動荷載、地震荷載作用時的橋面反應(yīng)進行了計算分析。與地震荷載做對比,移動荷載列的貢獻值雖然小但是不可忽略的；列車以不同速度過橋時,橋面節(jié)點的動力響應(yīng)值會隨著車速的提高而增大。
[Abstract]:As China's railway train constant speed, load increasing, the proportion of the bridge in the railway system is increasing, the power of train and bridge interaction has become an important issue. At the same time, the frequent seismic moment, high-speed railway seismic alarm system and emergency disposal system has become the guarantee of effective technical means for high iron the seismic safety of the vehicle bridge coupling system of seismic response analysis is a basic understanding of the seismic performance of bridge system of high-speed railway, high-speed railway is a necessary part of earthquake alarm threshold analysis system and the basis. In this paper, the research status at home and abroad on the dynamic interaction of vehicle bridge coupling system and reviews the history of the development of the status quo, summarizes the research results and the existing experience, established coupled system seismic response analysis model, comprehensively carried out The research on the coupling vibration of vehicle and Bridge under earthquake. The main contents include:
1) the purpose, significance, present situation and existing problems of the research on the dynamic response of the high-speed railway bridge under the earthquake action are elaborated in detail.
In the previous study, the bridge seismic and vehicle bridge coupling dynamic response analysis of two independent research projects, the train running on the bridge at the same time by the increased probability of seismic loads, the seismic research and earthquake bridge coupling system under the train on the bridge to go on for security has become an important research topic.
2) based on the design parameters of the existing high speed railway bridge, the bridge coupling model is established by Midas-Civil software and the dynamic characteristics are analyzed.
Considering the effect of train, there is a great difference between the natural frequency of vehicle bridge coupling model and the natural frequency of bridge. By changing vehicle location, pier height and span parameters, the corresponding self vibration characteristics of vehicle bridge coupling model are obtained.
3) the seismic response analysis of the vehicle bridge coupling system and the safety assessment of the train operation are carried out.
Through the Midas finite element model of vehicle bridge coupling system for seismic response analysis, and then to the deck response as input, join the track irregularity data, calculate the dynamic response of the train, and the safety index of train based on train running safety was evaluated. When the change speed and train vibration acceleration peak, got three an index of safety of the train (wheel rail lateral force, derailment coefficient, wheel load reduction rate) the corresponding changes and safety limits.
4) the dynamic response analysis of the bridge structure under the fast moving train load is completed by the finite element method.
The static load of the train, the train load, the response when earthquake load are calculated and analyzed. Compared with seismic load, moving load series contribution value is small but not negligible; train at different speeds when the bridge deck, dynamic node response value will increase as the speed increases.

【學位授予單位】：中國地震局工程力學研究所
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.3;U211.3

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本文編號：1403263