發(fā)布時(shí)間：2018-11-12 11:38

【摘要】：隨著我國(guó)公路交通運(yùn)輸?shù)陌l(fā)展,早期修建的公路通行能力日趨飽和,部分公路已不能滿足交通量的增長(zhǎng)需求,以前已有很多的橋梁結(jié)構(gòu)已經(jīng)不能滿足現(xiàn)有的通行要求或者超過(guò)了原有橋梁的承載能力;在公路改擴(kuò)建工程中,基于現(xiàn)有的橋梁通行能力和承載能力,為使其滿足公路橋梁今后的通行需求,提高公路橋梁的通行能力和服務(wù)水平,要么進(jìn)行改建、要么進(jìn)行重建或者對(duì)原橋進(jìn)行加固,當(dāng)然在能滿足今后通行和承載能力的基礎(chǔ)上是可以繼續(xù)沿用的,但是當(dāng)進(jìn)行橋梁拼寬擴(kuò)大其通行能力時(shí),新舊橋梁之間的變形和受力協(xié)調(diào)性問(wèn)題是橋梁擴(kuò)建拼寬中的主要問(wèn)題,在橋梁擴(kuò)建拼寬中,老橋沉降、收縮、徐變等變形已經(jīng)基本或大都完成,而新橋剛建會(huì)產(chǎn)生較大的沉降、收縮、徐變等變形,導(dǎo)致新老橋之間產(chǎn)生變形差異,從而導(dǎo)致新橋?qū)蠘蚝屠蠘驅(qū)π聵虻淖冃魏透郊觾?nèi)力的影響,有必要對(duì)新橋在產(chǎn)生沉降、收縮、徐變時(shí)老橋、新橋中產(chǎn)生的附加內(nèi)力和變形進(jìn)行研究,從而為橋梁擴(kuò)建設(shè)計(jì)施工提出理論措施建議。本論文以云南小磨二級(jí)公路改建為高速公路的龍茵1號(hào)大橋改擴(kuò)建工程中的預(yù)應(yīng)力混凝土T梁橋?yàn)橐劳?使用混凝土收縮徐變計(jì)算理論,采用有限元計(jì)算軟件Midas Civil,深入探討橋梁在進(jìn)行擴(kuò)建以后,由于新舊橋混凝土的收縮徐變以及基礎(chǔ)沉降的差異對(duì)橋梁上部結(jié)構(gòu)產(chǎn)生的附加影響。本論文開(kāi)展了以下工作:(1)通過(guò)對(duì)國(guó)內(nèi)外相關(guān)文獻(xiàn)資料進(jìn)行收集分析,總結(jié)橋梁擴(kuò)建過(guò)程中常用的設(shè)計(jì)施工方法及適用條件。(2)研究分析混凝土收縮、徐變的計(jì)算方法,總結(jié)在不同外界因素作用條件下計(jì)算混凝土收縮、徐變的方法、適用條件及存在的問(wèn)題。(3)結(jié)合混凝土收縮、徐變的計(jì)算方法,使用有限元軟件Midas Civil中的空間梁格法對(duì)云南省小磨二級(jí)公路改建為高速公路龍茵1號(hào)橋梁的擴(kuò)建工程進(jìn)行數(shù)值模擬計(jì)算,工程擴(kuò)建后,舊橋主梁混凝土收縮、徐變已經(jīng)大部分完成,新橋混凝土的收縮徐變剛剛開(kāi)始或還未完成,新舊橋混凝土在收縮徐變上的差異必將產(chǎn)生對(duì)橋梁上部結(jié)構(gòu)的附加內(nèi)力和變形位移的影響,分析因此而產(chǎn)生的附加內(nèi)力和變形位移的變化規(guī)律。(4)由于新橋基礎(chǔ)的沉降還未完成,而舊橋的基礎(chǔ)沉降已經(jīng)基本完成,新舊橋的沉降差異必將導(dǎo)致新舊橋主梁之間產(chǎn)生附加內(nèi)力,分析因此而產(chǎn)生相應(yīng)的附加內(nèi)力對(duì)新舊橋上部結(jié)構(gòu)的影響以及變化規(guī)律。(5)綜合分析新舊橋梁由于混凝土的收縮、徐變以及基礎(chǔ)沉降的差異產(chǎn)生的附加內(nèi)力對(duì)新舊橋梁本身的內(nèi)力和變形位移穩(wěn)定性影響。(6)根據(jù)以上模擬計(jì)算分析結(jié)果和相關(guān)橋梁的設(shè)計(jì)理論、施工方法�？偨Y(jié)和提出減小混凝土土收縮徐變差異和基礎(chǔ)沉降差異對(duì)橋梁結(jié)構(gòu)影響的工程措施,采取科學(xué)合理的工程措施。
[Abstract]:With the development of highway transportation in our country, the capacity of the highway built in the early period is becoming more and more saturated, and some of the highways can no longer meet the increasing demand of traffic volume. In the past, many bridge structures have been unable to meet the existing traffic requirements or beyond the original bridge bearing capacity; In the highway reconstruction and expansion project, based on the existing bridge capacity and bearing capacity, in order to meet the future needs of highway bridges, improve the capacity and service level of highway bridges, or rebuild, Either rebuild or reinforce the original bridge. Of course, it can continue to be used on the basis of satisfying the traffic and carrying capacity in the future, but when the bridge is widened to expand its capacity, The problem of deformation and stress coordination between old and new bridges is the main problem in bridge expansion and widening. In the process of bridge expansion and widening, the deformation of old bridges, such as settlement, shrinkage and creep, has been basically or largely completed, but the new bridges will produce large settlement when they are just built. Shrinkage, creep and other deformation, resulting in the new bridge deformation difference between the old bridge and the old bridge on the new bridge deformation and additional internal force, it is necessary to the new bridge in the process of settlement, shrinkage, creep old bridge, The additional internal force and deformation produced in the new bridge are studied, so as to put forward some theoretical measures for the bridge expansion design and construction. This paper is based on the prestressed concrete T-beam bridge in the reconstruction and extension project of Longyin No. 1 Bridge in Yunnan Xiaomo second class highway. The theory of concrete shrinkage and creep calculation is used, and the finite element calculation software Midas Civil, is used. After the expansion of the bridge, the additional effects on the superstructure of the bridge caused by the shrinkage and creep of the new and old bridges and the difference of the foundation settlement are discussed. This paper has carried out the following work: (1) through the collection and analysis of the domestic and foreign related literature, the common design and construction methods and applicable conditions in the process of bridge expansion are summarized. (2) the concrete shrinkage is studied and analyzed. The calculation method of creep, the method of calculating concrete shrinkage and creep under different external factors, the applicable conditions and the existing problems are summarized. (3) combined with the calculation method of concrete shrinkage and creep, The spatial beam method of finite element software Midas Civil is used to simulate the extension of the second grade highway of Xiaomo in Yunnan province into the extension project of Longyin 1 bridge of expressway. After the expansion, the concrete of the main girder of the old bridge shrinks. The creep has been mostly completed, the shrinkage and creep of the new bridge concrete has just begun or not, the difference of the new and old bridge concrete in the shrinkage and creep will have the influence on the additional internal force and the deformation displacement of the superstructure of the bridge. The changes of additional internal force and deformation displacement are analyzed. (4) because the settlement of the new bridge foundation has not been completed, the settlement of the old bridge foundation has been basically completed. The settlement difference between the old and the new bridges will lead to additional internal forces between the main beams of the new and old bridges. The influence of the additional internal force on the superstructure of the new bridge and the old bridge is analyzed. (5) the shrinkage of the new and old bridges due to concrete is comprehensively analyzed. The creep and the additional internal force caused by the difference of foundation settlement affect the stability of internal force and deformation displacement of the new and old bridges. (6) according to the results of simulation calculation above and the design theory and construction method of the bridge concerned. The engineering measures to reduce the difference of shrinkage and creep of concrete soil and the difference of foundation settlement to bridge structure are summarized and put forward, and scientific and reasonable engineering measures are taken.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 辛偉;;沈陽(yáng)繞城高速公路改擴(kuò)建工程安全性評(píng)價(jià)分析[J];北方交通;2013年06期

2 劉方華;涂旭鳴;姚鋒;;梁格法在連續(xù)箱梁橋建模中具體劃分研究[J];湖南工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2012年04期

3 賀鐵飛;孫鐵鋼;;既有橋梁拓寬上部結(jié)構(gòu)接縫處理方法分析研究[J];城市道橋與防洪;2012年06期

4 譚少華;邱新林;;廣佛高速公路擴(kuò)建工程橋梁拼接技術(shù)[J];中外公路;2010年02期

5 雷莉;;岱黃高速公路擴(kuò)建工程橋梁拼接方案研究[J];公路交通技術(shù);2009年03期

6 梁志廣;周濱;袁磊;;公路橋梁拓寬拼接方式綜述[J];中國(guó)市政工程;2008年06期

7 雷芳華;;減縮劑簡(jiǎn)述[J];廣東建材;2008年03期

8 何琨,朱軍;中國(guó)高速公路建設(shè)歷程與發(fā)展戰(zhàn)略[J];筑路機(jī)械與施工機(jī)械化;2004年10期

9 郭立民,于彩云;橋面拓寬改建的方法[J];黑龍江交通科技;2004年07期

10 王云泉;高速公路經(jīng)營(yíng)企業(yè)運(yùn)作中存在的問(wèn)題及對(duì)策[J];山東經(jīng)濟(jì);2003年03期

相關(guān)碩士學(xué)位論文 前10條

1 孔令梅;混凝土徐變對(duì)連續(xù)梁橋預(yù)拱度設(shè)置的研究[D];河北工程大學(xué);2015年

2 陳敏;高速公路中先簡(jiǎn)支后連續(xù)T型梁橋空間受力分析[D];重慶交通大學(xué);2014年

3 王玉娜;改擴(kuò)建高速公路現(xiàn)狀評(píng)價(jià)及設(shè)計(jì)優(yōu)化[D];鄭州大學(xué);2014年

4 涂兵;混凝土收縮預(yù)測(cè)模型及拼寬橋梁結(jié)構(gòu)的收縮效應(yīng)[D];湖南大學(xué);2013年

5 朱永紅;基于徐變模式下的連續(xù)梁橋力學(xué)性能數(shù)值分析[D];長(zhǎng)安大學(xué);2013年

6 毛志堅(jiān);預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋橫向拼接靜力性能研究[D];長(zhǎng)安大學(xué);2013年

7 楊廷樹(shù);預(yù)應(yīng)力混凝土箱梁橋收縮徐變精細(xì)化分析[D];長(zhǎng)安大學(xué);2012年

8 張?chǎng)?橋梁加寬后結(jié)構(gòu)分析和試驗(yàn)研究[D];長(zhǎng)安大學(xué);2011年

9 何文杰;中小跨徑梁橋拓寬結(jié)構(gòu)受力分析[D];長(zhǎng)安大學(xué);2011年

10 劉勝鋒;大跨度連續(xù)剛構(gòu)橋徐變下?lián)戏治鯷D];重慶交通大學(xué);2010年

，

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