大跨度鐵路鋼混結(jié)合梁斜拉橋施工控制及關(guān)鍵技術(shù)研究
發(fā)布時(shí)間:2018-09-08 11:10
【摘要】:鋼混結(jié)合梁斜拉橋以獨(dú)特的性能在國(guó)內(nèi)被首次用于鐵路建設(shè)中,斜拉橋承受列車活載遠(yuǎn)大于公路汽車荷載。故對(duì)鐵路專用鋼混結(jié)合梁斜拉橋的施工控制顯得尤為重要,一些關(guān)鍵的施工過程值得深入探討研究,為今后同類型鐵路斜拉橋施工積累寶貴經(jīng)驗(yàn)。論文以某鐵路特大橋工程施工為研究背景,,采用有限元分析軟件Midas和Ansys對(duì)本橋進(jìn)行了以下研究: 1、研究在成橋狀態(tài)下斜拉橋主梁段和索塔的應(yīng)力分布情況,確定斜拉索的初拉力和成橋狀態(tài)下斜拉索的索力,驗(yàn)證了主梁、主塔設(shè)計(jì)和斜拉索索力大小分布的合理性;基于鋼箱梁梁上運(yùn)梁法,研究在施工階段中主梁的上下緣應(yīng)力最大值與最小值和斜拉索索力最大值與最小值,從而確定最大值出現(xiàn)的施工階段和位置。 2、采用Midas有限元軟件分析承臺(tái)大體積混凝土內(nèi)部的溫度狀況,選擇典型的測(cè)點(diǎn)為研究對(duì)象,分析在水平方向和豎直方向上承臺(tái)內(nèi)部的溫度梯度關(guān)系,和加設(shè)冷管前后對(duì)承臺(tái)溫度的影響,描述了承臺(tái)溫度對(duì)冷管直徑和水流量的敏感性情況。 3、在施工過程中超高索塔會(huì)出現(xiàn)較大的懸臂段,采用Midas有限元軟件對(duì)索塔施工過程進(jìn)行模擬分析,針對(duì)施工過程中出現(xiàn)的一些不利因素采取相應(yīng)的控制措施來改善懸臂施工對(duì)索塔產(chǎn)生的影響。 4、采用Midas軟件對(duì)索塔與下橫梁采取同步施工還是異步施工進(jìn)行了對(duì)比分析。 5、索塔鋼錨箱是斜拉橋中一個(gè)關(guān)鍵特殊部位,它的質(zhì)量如何決定斜拉橋后期的使用效果。在斜拉索索索力最大的情況下,分別采用Midas和Ansys有限元軟件對(duì)鋼錨箱進(jìn)行建模分析,將結(jié)果進(jìn)行比較,分析鋼錨箱各主要組成部分的應(yīng)力分布情況。
[Abstract]:Cable-stayed bridges with steel-concrete composite beams have been used in railway construction for the first time in China because of their unique performances, and the live loads of the trains are much greater than those of the highway vehicles. Based on the construction of a railway super-large bridge as the research background, the paper uses the finite element analysis software Midas and Ansys to study the bridge as follows:
1. Study the stress distribution of the main girder and pylon of the cable-stayed bridge in the completed state, determine the initial tension of the cable and the cable force of the cable in the completed state, verify the rationality of the girder, the design of the main pylon and the distribution of the cable force of the cable in the completed state. The maximum value and minimum value of cable force and the maximum value and minimum value of cable force can be used to determine the construction stage and location of the maximum value.
2. Using Midas finite element software to analyze the internal temperature of mass concrete cap, select typical measuring points as the research object, analyze the temperature gradient relationship in the horizontal and vertical direction of cap, and the influence of cold pipe on cap temperature before and after installing cold pipe, describe the sensitivity of cap temperature to cold pipe diameter and water flow rate. Condition.
3. Large cantilever section will appear in the construction process of super-high pylon. Midas finite element software is used to simulate and analyze the construction process of pylon. Corresponding control measures are taken to improve the influence of cantilever construction on pylon.
4, the Midas software is used to compare and analyze the synchronous construction of the pylon and the lower crossbeam or the asynchronous construction.
5. The steel anchor box of the pylon is a key special part of the cable-stayed bridge, and its quality determines the later service effect of the cable-stayed bridge. Condition.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U448.27
本文編號(hào):2230349
[Abstract]:Cable-stayed bridges with steel-concrete composite beams have been used in railway construction for the first time in China because of their unique performances, and the live loads of the trains are much greater than those of the highway vehicles. Based on the construction of a railway super-large bridge as the research background, the paper uses the finite element analysis software Midas and Ansys to study the bridge as follows:
1. Study the stress distribution of the main girder and pylon of the cable-stayed bridge in the completed state, determine the initial tension of the cable and the cable force of the cable in the completed state, verify the rationality of the girder, the design of the main pylon and the distribution of the cable force of the cable in the completed state. The maximum value and minimum value of cable force and the maximum value and minimum value of cable force can be used to determine the construction stage and location of the maximum value.
2. Using Midas finite element software to analyze the internal temperature of mass concrete cap, select typical measuring points as the research object, analyze the temperature gradient relationship in the horizontal and vertical direction of cap, and the influence of cold pipe on cap temperature before and after installing cold pipe, describe the sensitivity of cap temperature to cold pipe diameter and water flow rate. Condition.
3. Large cantilever section will appear in the construction process of super-high pylon. Midas finite element software is used to simulate and analyze the construction process of pylon. Corresponding control measures are taken to improve the influence of cantilever construction on pylon.
4, the Midas software is used to compare and analyze the synchronous construction of the pylon and the lower crossbeam or the asynchronous construction.
5. The steel anchor box of the pylon is a key special part of the cable-stayed bridge, and its quality determines the later service effect of the cable-stayed bridge. Condition.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U448.27
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 余定軍;王吉英;劉勇;袁錫權(quán);;斜拉橋鉆石形主塔下橫梁與塔柱異步施工技術(shù)[J];公路;2010年11期
2 金曉宏;;斜拉橋承臺(tái)大體積混凝土溫度場(chǎng)仿真分析[J];公路;2010年12期
3 白光亮;蒲黔輝;夏招廣;;大跨度斜拉橋混凝土索塔鋼錨箱空間有限元分析研究[J];公路交通科技;2008年08期
4 陳剛毅;江建斌;丁望星;干學(xué)軍;;荊岳長(zhǎng)江公路大橋超高H形橋塔施工過程分析[J];中外公路;2010年05期
5 余鋒;姚清濤;游新鵬;;斜拉橋索塔錨固區(qū)受力性能數(shù)值模擬及分析[J];中外公路;2011年02期
6 孫才志;趙雷;陳文元;;大跨度結(jié)合梁斜拉橋施工階段靜力分析[J];四川建筑科學(xué)研究;2012年06期
7 楊秋玲,馬可栓;大體積混凝土水化熱溫度場(chǎng)三維有限元分析[J];哈爾濱工業(yè)大學(xué)學(xué)報(bào);2004年02期
8 陳開利,余天慶,習(xí)剛;混合梁斜拉橋的發(fā)展與展望[J];橋梁建設(shè);2005年02期
9 張燕飛;高宗余;梅新詠;;多塔大跨鐵路斜拉橋方案研究[J];橋梁建設(shè);2010年03期
10 蔡軍;王勇;薛其林;;混凝土斜拉橋雙直立塔柱形索塔與下橫梁異步施工控制[J];交通科技;2011年05期
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