【摘要】：八七型鐵路應(yīng)急搶修鋼梁(簡稱八七梁)是目前我國適應(yīng)跨度最大的搶修鋼梁,具有結(jié)構(gòu)簡單,組裝方便,拼架速度快,使用面廣等特點(diǎn),滿足戰(zhàn)時(shí)鐵路保障與平時(shí)搶險(xiǎn)救災(zāi)應(yīng)急使用的要求。隨著社會(huì)和國家經(jīng)濟(jì)不斷發(fā)展變化,鐵路運(yùn)輸在提高列車速度以加快貨物周轉(zhuǎn)的同時(shí),也要求大幅度提高列車的載貨重量。國內(nèi)外鐵路重載運(yùn)輸經(jīng)驗(yàn)表明,通過對(duì)線橋設(shè)備進(jìn)行合理的強(qiáng)化改造,實(shí)現(xiàn)在既有鐵路開行大軸重貨物列車,是提高運(yùn)輸能力與效率的最佳途徑,這必然會(huì)出現(xiàn)在重載列車活載作用下八七梁的適應(yīng)性問題�；谏鲜銮闆r,本文開展了如下工作:(1)介紹了八七梁的技術(shù)條件和特點(diǎn)、結(jié)構(gòu)部件、橋跨結(jié)構(gòu)型式。(2)利用有限元軟件ANSYS建立了不同橋跨型式不同跨度八七梁有限元模型,對(duì)其進(jìn)行了動(dòng)力特性分析。(3)在建立的有限元模型上分別按原設(shè)計(jì)活載(前進(jìn)型機(jī)車單機(jī)隨掛7 t/m勻載)、中—活載、不同軸重ZH標(biāo)準(zhǔn)活載(25 t軸重、27 t軸重及30 t軸重)等共五種列車活載圖式,對(duì)結(jié)構(gòu)的強(qiáng)度、剛度、穩(wěn)定性進(jìn)行了計(jì)算分析,并根據(jù)《鐵路橋梁搶修(建)技術(shù)規(guī)程》(試行)對(duì)計(jì)算結(jié)果進(jìn)行校核。(4)針對(duì)不同載荷狀態(tài)下,不同跨度和結(jié)構(gòu)形式的八七梁結(jié)構(gòu)中不滿足規(guī)范的情況,進(jìn)行了使用方案的改進(jìn)措施研究。通過本論文研究,分析比較了八七梁在不同列車活載圖式作用下的力學(xué)性能變化規(guī)律,得出了相應(yīng)活載下滿足規(guī)范要求和不滿足規(guī)范要求的八七梁適用情況,并經(jīng)過對(duì)部分八七梁使用方案的改進(jìn),使之能夠適應(yīng)重載鐵路橋梁搶修需要。研究結(jié)果提高了八七梁的適應(yīng)性,可為將來八七梁用于重載鐵路橋梁的搶修工程提供技術(shù)支撐。
[Abstract]:87 type railway emergency repair steel beam (abbreviated as 87 beam) is the largest emergency repair steel beam with the largest span in our country at present. It has the characteristics of simple structure, convenient assembly, fast framing speed and wide use, which meets the requirements of emergency use of railway support and emergency relief in peacetime. With the continuous development and change of society and national economy, railway transportation not only increases the train speed to speed up the cargo turnover, but also requires a large increase in the load of the train. The experience of railway heavy load transportation at home and abroad shows that it is the best way to improve the transportation capacity and efficiency by reasonably strengthening the line and bridge equipment to realize the operation of large axle load freight train in the existing railway, which will inevitably occur in the adaptability of 87 beams under the live load of heavy duty train. Based on the above situation, the following work has been carried out in this paper: (1) the technical conditions and characteristics of the eight seven beams, structural components and bridge span structure types are introduced. (2) the finite element models of different bridge span types and different span 87 beams are established by using the finite element software ANSYS, and their dynamic characteristics are analyzed. (3) on the established finite element model, the live load is designed according to the original design. Five kinds of train live load schemas, including 25 t axle load, 27 t shaft load and 30 t axle load, are calculated and analyzed, and the calculation results are checked according to the Technical Specification for Emergency repair (Construction) of Railway Bridges (trial). (4) according to the different load conditions, the eight seven beam structures with different span and structural form are not satisfied with the specification. (4) according to the technical specification for emergency repair (construction) of railway bridges (trial), the calculation results are checked according to the calculation results of five kinds of train live load schemas (25 t axle load, 27 t shaft load and 30 t axle load). The improvement measures of the use scheme are studied. Through the research of this paper, the change law of mechanical properties of 87 beams under the action of different train live load schemas is analyzed and compared, and the applicable conditions of 87 beams which meet the requirements of the code and do not meet the requirements of the code under the corresponding live load are obtained, and through the improvement of the use scheme of some 87 beams, it can meet the needs of emergency repair of heavy load railway bridges. The research results improve the adaptability of the 87 beam and provide technical support for the emergency repair project of the 87 beam used in the heavy load railway bridge in the future.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.7;U441

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本文編號(hào)：2500135