發(fā)布時(shí)間：2018-08-13 09:31

【摘要】：在我國(guó)高速鐵路和山區(qū)鐵路高速發(fā)展的今天,鋼管混凝土拱橋由于具有跨越能力大、梁高低、造型美觀等優(yōu)點(diǎn),正不斷得到應(yīng)用。廣西沿海高速鐵路是廣西第一條運(yùn)營(yíng)的高速鐵路,速度目標(biāo)值：250km/h,欽江鐵路特大橋是其中的控制工程,主橋采用2×128m下承式簡(jiǎn)支鋼管混凝土系桿拱,系梁采用預(yù)應(yīng)力鋼筋混凝土箱梁,拱上結(jié)構(gòu)為鋼管混凝土。我國(guó)西南山區(qū)是地震頻發(fā)地區(qū),為了在地震發(fā)生時(shí)降低控制工程的損害,保持整條鐵路的通暢運(yùn)行,對(duì)欽江鐵路特大橋進(jìn)行地震分析是非常有必要和具有重要意義的。本文從鋼管混凝土結(jié)構(gòu)的發(fā)展歷程著手,分析橋梁震害形式,并且系統(tǒng)的介紹拱橋動(dòng)力學(xué)原理和橋梁抗震的分析方法,選取欽江鐵路特大橋工程實(shí)例,利用大型有限元軟件Midas/civil建立三維空間模型,分析高速鐵路大跨度鋼管混凝土拱橋的動(dòng)力性能,主要進(jìn)行了以下工作：(1)鋼管混凝土拱橋的模型建立。本文利用有限元軟件Midas/civil,采用等效截面法模擬啞鈴型截面,建立比較精確的三維空間模型。(2)鋼管混凝土拱橋自振特性分析。在建立合理空間模型基礎(chǔ)上,使用多重Ritz向量法進(jìn)行自振特性分析,并對(duì)結(jié)構(gòu)的基頻和振型進(jìn)行分析。計(jì)算結(jié)果顯示基頻為0.518Hz,豎向自振頻率為1.723 Hz,系梁撓度最大值為38mm,均滿足規(guī)范要求。(3)鋼管混凝土拱橋的反應(yīng)譜分析�？紤]橋梁實(shí)際地質(zhì)條件、基本信息,選用合適的反應(yīng)譜函數(shù),采用完全開平方(CQC)法進(jìn)行分析計(jì)算,并對(duì)結(jié)構(gòu)典型截面的內(nèi)力和位移進(jìn)行分析,表明橫橋向地震荷載在抗震設(shè)計(jì)中起控制作用,建議設(shè)置橫向限位裝置。(4)鋼管混凝土拱橋的動(dòng)態(tài)時(shí)程分析。選擇EI波、Taft波和蘭州波,經(jīng)過調(diào)整后分別對(duì)橋梁從橫向,縱向和豎向三方向組合分析,并對(duì)結(jié)構(gòu)典型截面的位移和內(nèi)力進(jìn)行分析,表明地震波的橫向輸入對(duì)結(jié)構(gòu)的影響較大,提高結(jié)構(gòu)的抗震能力應(yīng)該通過優(yōu)化橫撐設(shè)置等方法對(duì)結(jié)構(gòu)橫向剛度進(jìn)行適當(dāng)加強(qiáng)。通過以上地震響應(yīng)分析,對(duì)欽江鐵路特大橋抗震設(shè)計(jì)提出一些參考建議。
[Abstract]:With the rapid development of high-speed railway and mountainous railway in our country, concrete filled steel tube arch bridge is being used continuously because of its advantages of large span ability, high and low beam, beautiful shape and so on. Guangxi coastal high speed railway is the first high speed railway in Guangxi. The speed target value is 250 km / h. The Qinjiang railway bridge is one of the control projects. The main bridge adopts 2 脳 128 m through concrete filled steel tube tie arch. Prestressed reinforced concrete box girder is used in the tie beam and concrete filled steel tube structure is used on the arch. In order to reduce the damage of the control project and keep the whole railway running smoothly, it is very necessary and significant to carry out seismic analysis of the Qinjiang railway bridge in the mountainous area of southwest China. Based on the development of concrete-filled steel tube (CFST) structure, this paper analyzes the earthquake damage form of bridge, and systematically introduces the dynamic principle of arch bridge and the seismic analysis method of bridge. Using the finite element software Midas/civil to establish the three-dimensional spatial model and analyze the dynamic performance of the long-span concrete-filled steel tube arch bridge in high-speed railway. The main work is as follows: (1) the model of the concrete filled steel tube arch bridge is established. In this paper, using the finite element software Midas / civil, the equivalent section method is used to simulate the dumbbell-shaped section, and a more accurate three-dimensional spatial model is established. (2) the natural vibration characteristics of concrete-filled steel tubular arch bridge are analyzed. On the basis of establishing a reasonable spatial model, the natural vibration characteristics of the structure are analyzed by using multiple Ritz vector method, and the fundamental frequency and mode shape of the structure are analyzed. The calculation results show that the fundamental frequency is 0.518 Hz, the vertical natural vibration frequency is 1.723 Hz, and the maximum deflection of the tie beam is 38 mm. (3) the response spectrum of concrete-filled steel tubular arch bridge is analyzed. Considering the actual geological conditions of the bridge, the basic information, choosing the appropriate response spectrum function, using the completely square (CQC) method to analyze and calculate the internal force and displacement of the typical section of the structure, the internal force and displacement of the typical section of the structure are analyzed. It is suggested that lateral limit devices should be set up. (4) dynamic time history analysis of concrete-filled steel tubular arch bridges. Selecting ei wave Taft wave and Lanzhou wave, after adjustment, the bridge is analyzed separately from transverse, longitudinal and vertical directions, and the displacement and internal force of typical section of the structure are analyzed. The results show that the transverse input of seismic wave has a great influence on the structure. In order to improve the seismic capacity of the structure, the transverse stiffness of the structure should be strengthened by optimizing the setting of transverse braces. Based on the above seismic response analysis, some suggestions for seismic design of Qinjiang Railway Bridge are put forward.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55;U448.22

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 徐艷;George C Lee;范立礎(chǔ);胡世德;;Acomparative study between China and U.S.on seismic design philosophy and practice of a long span arch bridge[J];Earthquake Engineering and Engineering Vibration;2006年01期

2 嚴(yán)琨;周亦唐;李睿;;鋼管混凝土拱橋非線性地震響應(yīng)分析[J];交通標(biāo)準(zhǔn)化;2008年05期

3 李少?zèng)_;張毅;范存新;;大跨度鋼管砼拱橋地震反應(yīng)分析近期研究進(jìn)展[J];商丘師范學(xué)院學(xué)報(bào);2009年09期

4 林蓉;;淺談山區(qū)鐵路橋梁抗震設(shè)計(jì)[J];四川建筑;2013年02期

相關(guān)博士學(xué)位論文 前1條

1 高峻;基于汶川地震重建的農(nóng)居建造范式及其策略研究[D];浙江大學(xué);2012年

相關(guān)碩士學(xué)位論文 前2條

1 杜敏;白鶴灘水電站金沙江大橋模擬地震振動(dòng)臺(tái)試驗(yàn)研究[D];重慶交通大學(xué);2013年

2 孟極;地震區(qū)中小跨徑橋梁支座及橋墩選型研究[D];長(zhǎng)安大學(xué);2013年

，

本文編號(hào)：2180579