【摘要】：我國(guó)地域遼闊,物資運(yùn)量大、運(yùn)距遠(yuǎn),經(jīng)濟(jì)的高速發(fā)展對(duì)鐵路運(yùn)輸也提出了新的要求,在既有線上開行重載列車是一種低成本的可行方法,但勢(shì)必會(huì)對(duì)既有鐵路橋梁的安全性、疲勞壽命產(chǎn)生不利影響,因此,需對(duì)重載橋梁的受力性能進(jìn)行分析。本文以中國(guó)鐵路總公司科技研究開發(fā)計(jì)劃重大課題《京廣線既有鋼橋適應(yīng)大軸重重載運(yùn)輸?shù)年P(guān)鍵技術(shù)研究》(2013G010-A)為依托,以新菏長(zhǎng)東黃河大橋4×108 m連續(xù)鋼桁梁橋?yàn)檠芯繉?duì)象,分別采用有限元軟件Midas和ANSYS建立有限元模型,對(duì)重載列車作用下鋼桁梁橋的整體受力性能、桿件受力性能和疲勞壽命進(jìn)行了分析,主要研究?jī)?nèi)容和結(jié)論如下:(1)根據(jù)設(shè)計(jì)圖紙,確定長(zhǎng)東黃河大橋連續(xù)鋼桁梁部分的桿件截面尺寸、邊界條件、節(jié)點(diǎn)連接方式,建立Midas有限元模型并對(duì)其進(jìn)行校核。(2)對(duì)重載列車作用下鋼桁梁橋的整體受力適應(yīng)性進(jìn)行分析。采用Midas軟件進(jìn)行了靜力性能分析,結(jié)果表明重載列車荷載作用下的豎向撓度和在搖擺力、風(fēng)力作用下的橫向撓度均滿足現(xiàn)行規(guī)范要求。與中 活載下相比,豎向撓度安全裕度下降22%,橫向撓度安全裕度基本不變;采用ANSYS軟件進(jìn)行了動(dòng)力響應(yīng)分析,結(jié)果表明重載列車作用引起的跨中豎向動(dòng)撓度、橫向振幅、豎向加速度和活動(dòng)支座轉(zhuǎn)角分別比中 活載作用下增大26.0%、32.0%、42.9%和26.8%。(3)對(duì)重載列車作用下鋼桁梁橋的桿件受力適應(yīng)性進(jìn)行了分析,結(jié)果表明在中 活載作用下桿件應(yīng)力、應(yīng)力幅、穩(wěn)定性均滿足要求。在重載列車作用下桿件應(yīng)力滿足要求;跨中處下弦桿、支座處斜桿等桿件的應(yīng)力幅不滿足要求;跨中處上弦桿,支座處下弦桿、下平聯(lián)桿件、斜桿等部分桿件穩(wěn)定性不滿足要求。(4)對(duì)重載列車作用下鋼桁梁橋典型桿件的疲勞壽命進(jìn)行了分析。根據(jù)動(dòng)力分析中得到的典型桿件處的應(yīng)力時(shí)程,采用雨流法對(duì)應(yīng)力幅進(jìn)行計(jì)數(shù),得到累積損傷度,然后根據(jù)線性累積損傷原理分別對(duì)各典型桿件在重載列車和普通列車作用下的疲勞壽命進(jìn)行了分析�？傮w來說,該橋在C96重載編組列車作用下典型桿件的疲勞壽命比普通列車作用下平均縮短80%左右。
[Abstract]:China has a vast territory, large quantity of goods and materials, long transportation distance, and the rapid development of economy has put forward new requirements for railway transportation. It is a feasible method of low cost to operate heavy haul trains on existing railway lines, but it is bound to be safe for existing railway bridges. Fatigue life has a negative effect, so it is necessary to analyze the mechanical behavior of heavy-load bridges. This paper is based on the important project of China Railway Corporation Science and Technology Research and Development Plan (2013G010-A), which is the key technology of existing steel bridges of Beijing-Guangzhou railway line to adapt to heavy load transportation of large axles. Taking the 4 脳 108m continuous steel truss bridge of Xinhe Changdong Yellow River Bridge as the research object, the finite element model was established by using the finite element software Midas and ANSYS, respectively, and the overall mechanical behavior of the steel truss bridge under the action of heavy load train was studied. The main research contents and conclusions are as follows: (1) according to the design drawings, the section size, boundary condition and connection mode of continuous steel truss beam of Changdong Yellow River Bridge are determined. The finite element model of Midas is established and checked. (2) the adaptability of steel truss bridge under the action of heavy-haul train is analyzed. The static performance analysis using Midas software shows that the vertical deflection under heavy load and the lateral deflection under the action of swaying force and wind force can meet the requirements of the current code. Compared with the live load, the vertical deflection safety margin is reduced by 22 and the lateral deflection safety margin is not changed. The dynamic response analysis is carried out by using ANSYS software. The results show that the vertical deflection, lateral amplitude, vertical acceleration and rotation angle of moving support caused by the action of heavy-haul train are 26.0% and 32.0% higher than those under the action of live load, respectively. 42.9% and 26.8. (3) the stress adaptability of steel truss girder bridge under the action of heavy-haul train is analyzed. The results show that the stress, stress amplitude and stability of steel truss bridge under the action of live load meet the requirements. Under the action of heavy-haul train, the stress of the rod can not meet the requirements, the stress amplitude of the lower chord at the middle span and the inclined rod at the support does not meet the requirements. The stability of the upper chord at the center of the span, the lower chord at the support, the lower flat link and the inclined bar are not satisfied with the requirements. (4) the fatigue life of the typical steel truss bridge members under the action of the heavy haul train is analyzed. According to the stress time history at the typical member in the dynamic analysis, the stress amplitude is counted by the rain flow method, and the cumulative damage degree is obtained. Then the fatigue life of typical bars under the action of heavy haul train and ordinary train is analyzed according to the principle of linear cumulative damage. As a whole, the fatigue life of the typical rod of the bridge under the action of C96 heavy haul marshalling train is about 80% shorter than that of the ordinary train.
【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】：2015
【分類號(hào)】：U441

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相關(guān)期刊論文 前1條

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本文編號(hào)：2404703