本文選題：混凝土連續(xù)梁橋　切入點(diǎn)：頂推施工　出處：《長沙理工大學(xué)》2014年碩士論文

【摘要】：預(yù)應(yīng)力混凝土連續(xù)梁橋由于其結(jié)構(gòu)剛度好、少伸縮縫、變形小、易養(yǎng)護(hù)、經(jīng)濟(jì)適用等優(yōu)點(diǎn)在橋梁建設(shè)中占有不可或缺的地位。在橋梁施工過程中,常受到地形、地貌、交通運(yùn)輸線路等條件的限制,而頂推施工方法具有經(jīng)濟(jì)、必要設(shè)備少、所需施工場地小等優(yōu)點(diǎn),因而在橋梁施工中得到了廣泛的應(yīng)用。本文以頂推法施工的跨鐵路線預(yù)應(yīng)力混凝土連續(xù)箱梁橋?yàn)檠芯繉ο?圍繞湘府路湘江大橋京廣跨線聯(lián)這一工程背景,對頂推施工中的仿真分析、主墩與臨時(shí)墩的承載能力、鋼導(dǎo)梁試驗(yàn)以及頂推過程中的施工控制等展開研究。本文主要工作如下：(1)通過對連續(xù)梁橋頂推施工仿真計(jì)算的兩種基本形式(梁動(dòng)墩不動(dòng)模型和墩動(dòng)梁不動(dòng)模型)的對比分析,根據(jù)工程背景的相關(guān)情況選取墩動(dòng)梁不動(dòng)模型形式來進(jìn)行相關(guān)計(jì)算分析。應(yīng)用Midas Civil軟件對該橋頂推施工全過程進(jìn)行仿真計(jì)算分析,然后針對頂推施工過程中主墩的最不利情況對其進(jìn)行承載能力的驗(yàn)算、并在采取加固措施后進(jìn)行再次復(fù)核,得到的結(jié)果滿足要求；(2)通過建立的該橋頂推施工全過程的仿真計(jì)算分析模型,得到鋼導(dǎo)梁在頂推過程中在導(dǎo)梁與主梁聯(lián)結(jié)處的最大彎矩的最不利工況,并確定鋼導(dǎo)梁試驗(yàn)方案。然后針對鋼導(dǎo)梁試驗(yàn)實(shí)施過程中主梁與導(dǎo)梁連接處梁體出現(xiàn)裂縫的現(xiàn)象,建立該聯(lián)的空間實(shí)體模型,分析頂推過程中最不利工況下的結(jié)構(gòu)受力情況,探討鋼導(dǎo)梁試驗(yàn)重要性,以及相關(guān)分析。模型計(jì)算結(jié)果與現(xiàn)場實(shí)施過程中出現(xiàn)的問題相一致,計(jì)算得到在梁體出現(xiàn)裂縫位置處(即主梁與導(dǎo)梁聯(lián)結(jié)處腹板的下部)存在有較大拉應(yīng)力；(3)結(jié)合工程實(shí)例中頂推過程施工控制的橫向偏位、應(yīng)力、撓度、裂縫等方面的監(jiān)測進(jìn)行分析,為以后同類型橋梁頂推施工控制留下可靠的借鑒經(jīng)驗(yàn)。
[Abstract]:Prestressed concrete continuous beam bridge plays an indispensable role in bridge construction because of its advantages such as good structural stiffness, less expansion joints, small deformation, easy maintenance, economic applicability and so on.In the process of bridge construction, it is often restricted by the conditions of topography, geomorphology, transportation line, etc. However, the method of pushing construction has the advantages of economy, few necessary equipment and small construction site, so it has been widely used in bridge construction.In this paper, the prestressed concrete continuous box girder bridge constructed by the pushing method is taken as the research object, and the simulation analysis, the bearing capacity of the main pier and the temporary pier are analyzed around the engineering background of the Beijing-Guangzhou cross-line connection of Xiangjiang Bridge on the Xiangjiang River, Xiangfu Road, Xiangjiang River, Xiangjiang River, Xiangjiang River, Xiangjiang River, Hunan Province, Hunan Province.The test of steel guide beam and the construction control in the process of pushing are studied.The main work of this paper is as follows: (1) by comparing and analyzing the two basic forms of simulation calculation of continuous beam bridge's jacking construction (beam moving-pier immobility model and pier moving-beam immobility model),According to the relevant situation of engineering background, the fixed model form of pier moving beam is selected to carry on correlation calculation and analysis.Midas Civil software is used to simulate and analyze the whole process of jacking and construction of the bridge, and then the bearing capacity of the main pier is checked according to the most disadvantageous condition of the main pier in the process of jacking construction, and the reinforcement measures are taken to recheck the load capacity of the main pier.The obtained results meet the requirements of the bridge. By establishing the simulation analysis model of the whole process of the jacking and construction of the bridge, the most unfavorable working conditions of the maximum bending moment of the steel guide beam at the junction between the guide beam and the main beam during the jacking and pushing process are obtained, and the test scheme of the steel guide beam is determined.Then, in view of the cracks in the beam body at the connection between the main beam and the guide beam during the steel guide beam test, the spatial solid model of the joint is established, and the stress situation of the structure under the most unfavorable working conditions during the pushing process is analyzed, and the importance of the steel guide beam test is discussed.And related analysis.The results of the model are consistent with the problems in the field implementation.The calculation results show that there is a large tensile stress at the crack position (that is, the lower part of the web at the junction between the main beam and the guide beam) and the lateral deflection, stress and deflection controlled by the construction control in the pushing process in the engineering example.The monitoring of cracks and other aspects are analyzed in order to leave reliable experience for the construction control of the same type of bridges in the future.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.462

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 王昊,楊小玲;頂推斜拉橋連續(xù)梁預(yù)應(yīng)力施工[J];湖南交通科技;1996年01期

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本文編號(hào)：1701816