本文選題：連續(xù)箱梁橋 + 仿真分析��； 參考：《廣西大學》2015年碩士論文

【摘要】：近些年來,隨著對交通基礎設施建設的重視,我國的橋梁建設事業(yè)也得到了蓬勃發(fā)展,橋梁建設水平及施工工藝控制也取得了長足的進步。大跨度預應力混凝土連續(xù)箱梁橋由于它獨有的優(yōu)點被而被人們廣泛采用。然而隨著橋梁跨徑越來越大,結構越來越復雜,施工難度也在增大。再利用懸臂施工法進行橋梁施工過程中,隨機誤差和系統(tǒng)誤差是不可避免的,并將隨著懸臂梁段的增加而不斷累積。如果不對此進行誤差分析及線形修正,最終將導致橋梁線形偏離理論設計狀態(tài),導致合龍困難,并且已經建成的懸臂段的線形在施工后期是不可調節(jié)的,因此必須在橋梁施工過程中必須對施工監(jiān)控工作給予相當的重視。本文主要介紹了大跨度預應力混凝土箱梁橋結構的發(fā)展情況和研究概況,以及施工監(jiān)控的基本內容和施工控制的一般方法和步驟。主要內容是以欽江大橋為工程實踐案例,對該種類型橋梁的施工監(jiān)控方法進行研究；利用橋梁有限元軟件Midas Civil2012進行結構仿真分析,得到理論計算值,并與實測值進行了對照分析；針對該類型橋梁結構進行了參數敏感性分析,確定了結構設計中的主要設計參數,并根據實際情況進行反饋控制分析來調整計算參數。在線形和應力預測方面,本文對比了理論值和實測值的差異,介紹了最小二乘法的基本原理和公式推導過程。在線形控制為主的同時,同時注重對橋梁應力的監(jiān)控。因此對最小二乘法進行改進,采用線形和應力進行雙控來預測立模標高,以便指導實際橋梁施工,取得了良好的效果,保證了橋梁在施工后期能夠順利合龍。
[Abstract]:In recent years, with the attention paid to the construction of transportation infrastructure, the construction of bridges in our country has been flourishing, and the level of bridge construction and the control of construction technology have also made great progress. Long-span prestressed concrete continuous box girder bridge is widely used because of its unique advantages. However, as the span of the bridge becomes larger and larger, the structure becomes more and more complicated and the construction difficulty increases. In the process of bridge construction using cantilever construction method, random error and systematic error are inevitable, and will accumulate with the increase of cantilever beam section. If the error analysis and alignment correction are not carried out, the alignment of the bridge will deviate from the theoretical design state, resulting in the closure difficulty, and the alignment of the cantilever section that has been built will not be adjustable in the later stage of construction. Therefore, the construction monitoring work must be paid more attention in the process of bridge construction. This paper mainly introduces the development and research situation of long-span prestressed concrete box girder bridge structure, as well as the basic content of construction monitoring and the general methods and steps of construction control. The main content of this paper is to study the construction monitoring method of this type of bridge with Qinjiang Bridge as a practical case, and to obtain the theoretical calculation value by using the bridge finite element software Midas Civil 2012 to carry out structural simulation analysis. The parameter sensitivity analysis of the bridge structure is carried out, the main design parameters are determined, and the calculation parameters are adjusted by feedback control analysis according to the actual situation. In the aspect of linear and stress prediction, the difference between the theoretical value and the measured value is compared, and the basic principle of the least square method and the derivation process of the formula are introduced. At the same time, it pays attention to the monitoring of bridge stress. Therefore, the least square method is improved to predict the elevation of vertical formwork by double control of linear shape and stress, so as to guide the actual bridge construction and obtain good results, and ensure that the bridge can close smoothly in the later stage of construction.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.4

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相關期刊論文 前1條

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本文編號：2111942