本文選題：地震作用 + 城市輕軌��； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：城鎮(zhèn)化進(jìn)程的蓬勃發(fā)展帶來(lái)了城市交通系統(tǒng)的日益擁擠,相應(yīng)給城市居民出行及生活造成困難。跨座式輕軌可以極大地緩解交通壓力，而且對(duì)起伏復(fù)雜的地形有較強(qiáng)的適應(yīng)能力，有效的緩解了目前城市交通與城市發(fā)展的矛盾。以重慶嘉陵江輕軌專(zhuān)用連續(xù)剛構(gòu)橋?yàn)楣こ瘫尘�，利用橋梁分析軟件Midas Civil建立有限元模型，做了以下幾個(gè)方面的研究工作： ①論述地震災(zāi)害的特點(diǎn)以及國(guó)內(nèi)外近年來(lái)發(fā)生的較大地震實(shí)況；分析地震波的特性及其地震波與橋梁結(jié)構(gòu)的空間相關(guān)性；研究跨座式單軌交通系統(tǒng)的發(fā)展歷程以及目前國(guó)內(nèi)外的發(fā)展?fàn)顩r。 ②構(gòu)建地震介質(zhì)傳導(dǎo)作用下輕軌列車(chē)通過(guò)連續(xù)剛構(gòu)橋的動(dòng)力特性新理念，從地震波介質(zhì)載體動(dòng)態(tài)演化特征入手，研究地震波不同介質(zhì)對(duì)橋梁結(jié)構(gòu)內(nèi)力的影響，探尋其動(dòng)態(tài)傳遞規(guī)律，得到不同地震波介質(zhì)和不同場(chǎng)地條件下橋梁結(jié)構(gòu)響應(yīng)。 ③通過(guò)多重Ritz向量法對(duì)連續(xù)剛構(gòu)橋的自振特性分析，計(jì)算得到結(jié)構(gòu)的前十階自振頻率、周期和振型，并分析各個(gè)振型的特性；定義輕軌列車(chē)荷載、編組方式和各種工況，分析各種工況條件下連續(xù)剛構(gòu)橋和軌道梁各個(gè)控制截面的位移、加速度響應(yīng)以及各項(xiàng)動(dòng)力指標(biāo)所反映的橋梁實(shí)際狀況；得出位移幅值主要集中在8～17s，加速度幅值主要集中在中間時(shí)段的結(jié)論。 ④提出地震作用下列車(chē)-軌道-連續(xù)剛構(gòu)橋空間動(dòng)力分析模型，分析在地震作用下列車(chē)過(guò)橋時(shí)的動(dòng)力作用機(jī)理；采用多點(diǎn)激勵(lì)形式的動(dòng)態(tài)時(shí)程分析方法，選取Elcent地震波，分析連續(xù)剛構(gòu)橋在行車(chē)和地震作用雙重荷載下的動(dòng)力和內(nèi)力時(shí)程響應(yīng)，得出主跨跨中是薄弱部位，最大位移為8.2cm，最大加速度為2.07m/s2；承受軸力最大的部位是橋墩結(jié)構(gòu)，最大值為6763.09KN，主梁的最大軸力和彎矩在主跨的跨中處，為2602.40KN和26982.32kN·m，是整座橋的薄弱部位。 ⑤對(duì)地震作用下城市輕軌通過(guò)連續(xù)剛構(gòu)橋時(shí)橋梁結(jié)構(gòu)以及運(yùn)行車(chē)輛本身的安全性做深入的研究，確保乘車(chē)人的生命和財(cái)產(chǎn)安全。從不同橋墩高度，不同行車(chē)速度以及不同地震波強(qiáng)度三個(gè)方面，對(duì)所建的模型進(jìn)行地震作用下的響應(yīng)分析，，提出在地震發(fā)生時(shí)列車(chē)安全運(yùn)營(yíng)的建議。
[Abstract]:With the rapid development of urbanization, urban traffic system is becoming more and more crowded, which makes it difficult for urban residents to travel and live. The straddle light rail can greatly relieve the traffic pressure, and has a strong adaptability to the complex terrain, which effectively alleviates the contradiction between urban traffic and urban development. Taking the special continuous rigid frame bridge of Jialing River Light Rail in Chongqing as the engineering background, the finite element model is established by using the bridge analysis software Midas Civil. The research works are as follows: (1) the characteristics of earthquake disaster and the large earthquakes occurring at home and abroad in recent years are discussed, and the characteristics of seismic wave and the spatial correlation between seismic wave and bridge structure are analyzed. This paper studies the development course of straddle monorail transportation system and the current development situation at home and abroad. (2) constructing a new concept of dynamic characteristics of light rail train passing through continuous rigid frame bridge under seismic medium conduction, Based on the dynamic evolution characteristics of seismic wave medium carrier, the influence of different seismic wave media on the internal force of bridge structure is studied, and the dynamic transfer law of seismic wave medium carrier is explored. The responses of bridge structures under different seismic wave media and different sites are obtained. 3 the natural vibration characteristics of continuous rigid frame bridges are analyzed by multiple Ritz vector method, and the first ten natural frequencies, periods and modes of the structure are calculated. It also analyzes the characteristics of each mode, defines the load, marshalling mode and various working conditions of the light rail train, and analyzes the displacement of each control section of the continuous rigid frame bridge and track beam under various working conditions. Acceleration response and the actual state of the bridge reflected by each dynamic index; It is concluded that the displacement amplitude is mainly concentrated in 8 ~ 17s, and the acceleration amplitude is mainly concentrated in the middle period. 4 the spatial dynamic analysis model of train-track continuous rigid frame bridge under earthquake action is put forward. The dynamic mechanism of train crossing bridge under earthquake action is analyzed, and the dynamic and internal force response of continuous rigid frame bridge under the dual loads of driving and earthquake is analyzed by using the dynamic time-history analysis method of multi-point excitation form and selecting Elcent seismic wave. The maximum displacement is 8.2 cm, the maximum acceleration is 2.07 m / s ~ 2, the maximum axial force is the pier structure, the maximum value is 6763.09 KN, and the maximum axial force and bending moment of the main beam are at the middle of the main span, the maximum displacement of the main span is 8.2 cm and the maximum acceleration is 2.07 m / s ~ (2), and the maximum axial force is 6763.09 KN. For 2602.40KN and 26982.32kN, it is the weak part of the whole bridge. 5 the safety of the bridge structure and the running vehicle itself when the urban light rail passes through the continuous rigid frame bridge under earthquake is studied deeply to ensure the life and property safety of the passenger. From three aspects of different piers height, different driving speed and different seismic wave intensity, the response analysis of the model under earthquake action is carried out, and some suggestions for safe operation of trains in the event of earthquake are put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.23;U441.3

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