本文選題：橋梁　切入點(diǎn)：頂推施工　出處：《西南交通大學(xué)》2014年碩士論文

【摘要】：橋梁頂推施工法因其高度工業(yè)化、施工占地少、機(jī)具設(shè)備簡便、施工過程不阻斷交通、結(jié)構(gòu)整體性好、設(shè)備(模板等)可多次重復(fù)使用、施工過程平穩(wěn)無噪聲、施工速度快等優(yōu)點(diǎn)而被迅速推廣應(yīng)用,在中等跨徑的橋梁施工中已體現(xiàn)出較強(qiáng)的競爭力。隨著頂推設(shè)備的不斷創(chuàng)新,頂推法適用范圍逐漸擴(kuò)大,不可避免地會(huì)有傳統(tǒng)施工中未曾出現(xiàn)過的新問題相伴而生,結(jié)合相關(guān)文獻(xiàn)的閱讀以及參與頂推施工現(xiàn)場監(jiān)控工作所受到的啟發(fā),論文主要對頂推施工法的幾個(gè)關(guān)鍵問題進(jìn)行探討,并對鋼箱梁在頂推施工過程中關(guān)鍵部位受力進(jìn)行詳細(xì)分析研究。 (1)分別從不同的角度對頂推施工進(jìn)行明確分類,就頂推施工過程中的臨時(shí)設(shè)施起到的作用及其在施工中面臨的問題這兩個(gè)側(cè)面進(jìn)行討論,對頂推施工形成多方位的了解與認(rèn)識。 (2)采用經(jīng)典解析法和數(shù)值解法對頂推過程中主梁的受力進(jìn)行分析。得到主梁控制內(nèi)力、支點(diǎn)反力的解析表達(dá)式。利用桿系有限元模型對紹興濱海大橋鋼箱梁頂推施工過程進(jìn)行分析,得到頂推過程中反力、內(nèi)力、位移等變化規(guī)律,并進(jìn)行參數(shù)分析,揭示支點(diǎn)剛度變化以及頂推設(shè)備同步頂升量對頂推施工的影響。 (3)針對已經(jīng)得出的解析表達(dá)式,進(jìn)行數(shù)值分析,得到導(dǎo)梁的合理設(shè)計(jì)參數(shù),并針對導(dǎo)梁線形設(shè)計(jì)提出控制原則；針對頂推平臺梁體脫空時(shí)梁體受力安全提出控制原則,以及相應(yīng)的解決辦法與改善措施,以供施工參考。 (4)在介紹了接觸問題的分類及其計(jì)算方法之后,采用ANSYS建立空間梁-殼-實(shí)體-接觸混合有限元計(jì)算模型,對紹興濱海大橋頂推過程中最不利工況進(jìn)行空間應(yīng)力分析。研究鋼箱梁在頂推過程中所承受頂推設(shè)備反力的不均勻分配、彈性支座的應(yīng)力分布、彈性墊層剛度對鋼箱梁頂推施工的影響,給出了頂推施工中彈性墊層選擇的建議,并分析了梁體橫向偏移的影響；將計(jì)算結(jié)果與現(xiàn)場實(shí)測值對比,結(jié)果吻合良好。根據(jù)計(jì)算結(jié)果得到鋼箱梁在局部反力分布的簡化計(jì)算公式,以供同類型橋梁頂推施工參考。
[Abstract]:Due to its high industrialization, small construction area, simple equipment and equipment, no interruption of traffic during construction, good integrity of structure, repeated use of equipment (formwork, etc.), the construction process is smooth and noiseless. Because of the advantages of fast construction speed and so on, it has been popularized and applied rapidly, which has shown strong competitiveness in the bridge construction of medium span. With the continuous innovation of the pushing equipment, the scope of application of the thrusting method has gradually expanded. Inevitably, there will be some new problems that have not appeared in the traditional construction, which will be inspired by the reading of the relevant documents and the participation in the monitoring work of the construction site. This paper mainly discusses several key problems in the method of jacking construction, and makes a detailed analysis and research on the stress on the key parts of the steel box girder in the process of jacking construction. 1) categorizing the jacking construction from different angles, discussing the function of temporary facilities in the process of pushing construction and the problems they face in construction, and forming a multi-directional understanding and understanding of the jacking construction. (2) A classical analytical method and a numerical method are used to analyze the force of the main beam in the process of pushing, and the controlled internal force of the main beam is obtained. The analytical expression of the reaction force of the fulcrum. By using the finite element model of the bar system, the jacking construction process of the steel box girder of Shaoxing Binhai Bridge is analyzed, and the law of change of reaction force, internal force and displacement in the process of pushing is obtained, and the parameter analysis is carried out. This paper reveals the influence of the stiffness change of support point and the amount of synchronous lifting of the lifting equipment on the jacking construction. 3) according to the analytical expression obtained, the reasonable design parameters of the guide beam are obtained, and the control principle is put forward for the linear design of the guide beam, and the control principle for the force safety of the beam body when the platform beam is emptied is put forward. And the corresponding solutions and improvement measures for construction reference. (4) after introducing the classification of contact problems and their calculation methods, a hybrid finite element model of space beam-shell-solid contact is established by using ANSYS. The spatial stress analysis of the most unfavorable conditions during the pushing process of Shaoxing Binhai Bridge is carried out. The uneven distribution of the reaction force of the steel box girder and the stress distribution of the elastic support are studied. The influence of elastic cushion stiffness on the jacking construction of steel box girder is presented, the suggestion of selecting elastic cushion in jacking construction is given, and the influence of transverse deviation of beam body is analyzed, and the calculated results are compared with the field measured values. The results are in good agreement with each other. A simplified formula for calculating the local reaction force distribution of steel box girder is obtained, which can be used as a reference for the jacking construction of the same type of bridge.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.462

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