本文選題：矮塔斜拉橋 + 0#塊��； 參考：《東北林業(yè)大學(xué)》2014年碩士論文

【摘要】：矮塔斜拉橋以其優(yōu)良的結(jié)構(gòu)性能以及良好的經(jīng)濟(jì)指標(biāo),得到越來(lái)越廣泛的應(yīng)用。箱梁0#塊位于矮塔斜拉橋塔、墩、梁連接處,幾何形式和邊界條件都十分復(fù)雜,作為懸臂施工的起點(diǎn),施工過(guò)程中承擔(dān)兩側(cè)懸臂重量,通常布置大量的普通鋼筋與預(yù)應(yīng)力筋,并且隨著施工的進(jìn)展應(yīng)力不斷發(fā)生變化,處于復(fù)雜的三向受力狀態(tài),普通的平面桿系計(jì)算已不能滿足精度要求,因此建立0#塊三維空間有限元模型,細(xì)致分析0#塊空間應(yīng)力狀態(tài)是十分必要的。 本文以浙江省常山大橋(65+108+65m雙塔單索面矮塔斜拉橋)為工程背景,首先運(yùn)用MIDAS/civil有限元軟件,建立常山大橋平面桿系模型,進(jìn)行全橋靜力分析,重點(diǎn)計(jì)算最大懸臂階段及成橋階段兩種工況下結(jié)構(gòu)內(nèi)力、位移、應(yīng)力、索力,同時(shí)為后續(xù)0#塊實(shí)體模型的加載與分析提供數(shù)據(jù)準(zhǔn)備；其次運(yùn)用MIDAS/FEA有限元軟件,建立常山大橋0#塊空間有限元模型,基于箱梁空間應(yīng)力分析理論,分別對(duì)最大懸臂階段及成橋階段0#塊三向正應(yīng)力及主應(yīng)力進(jìn)行分析,細(xì)致掌握0#塊頂板、底板、腹板、橫隔板各區(qū)域的應(yīng)力數(shù)值及分布規(guī)律；最后根據(jù)施工現(xiàn)場(chǎng)實(shí)際情況及理論計(jì)算結(jié)果,選取0#塊應(yīng)力測(cè)試截面及測(cè)點(diǎn),埋置傳感器跟蹤監(jiān)測(cè)各主要施工階段0#塊應(yīng)力數(shù)值,總結(jié)懸臂施工過(guò)程中0#塊應(yīng)力變化規(guī)律,并及時(shí)與理論計(jì)算值作對(duì)比校核,分析誤差產(chǎn)生原因,保證施工安全順利進(jìn)行。 本文研究得出的結(jié)論可對(duì)依托工程提供數(shù)據(jù)支持,同時(shí)可為矮塔斜拉橋0#塊優(yōu)化設(shè)計(jì)、空間應(yīng)力計(jì)算分析及應(yīng)力監(jiān)測(cè)提供參考,具有重要的現(xiàn)實(shí)意義。
[Abstract]:The short tower cable-stayed bridge is more and more widely used because of its excellent structural performance and good economic index. The box girder 0# block is located in the short tower cable-stayed bridge tower, pier and beam connection, the geometric form and boundary condition are very complex. As the starting point of the cantilever construction, the weight of the cantilever on both sides of the cantilever construction is carried out in the construction process, and a large number of ordinary steel bars are usually arranged. With the prestressed reinforcement, and with the progress of the construction stress constantly changing, in the complex three direction force state, the ordinary plane bar system calculation can not meet the precision requirements. Therefore, it is necessary to establish the three-dimensional finite element model of 0# block and analyze the stress state of the 0# block in detail.
This paper takes the Changshan bridge in Zhejiang (65+108+65m Twin Towers single cable plane short tower cable-stayed bridge) as the engineering background. First, the MIDAS/civil finite element software is used to establish the plane bar model of Changshan bridge, and the static analysis of the whole bridge is carried out. The structural internal force, displacement, stress and cable force are calculated in the two working conditions of the maximum cantilever stage and the bridge stage. At the same time, it is the follow-up 0. The data preparation is provided for the loading and analysis of the block entity model. Secondly, the finite element model of the Changshan bridge 0# block is established by using the MIDAS/FEA finite element software. Based on the box beam spatial stress analysis theory, the three direction stress and the main stress of the maximum cantilever stage and the bridge stage 0# block are analyzed, and the roof, floor and web of the 0# block are carefully mastered. At last, according to the actual situation of the construction site and the theoretical calculation results, the stress test section and measuring point of the 0# block are selected according to the actual situation of the construction site and the theoretical calculation results. The stress value of the 0# block in the main construction stages is tracked by the buried sensor, and the stress variation law of the 0# block in the cantilever construction process is summarized, and the calculation value is in time with the theoretical calculation value. Compared with checking, the causes of errors are analyzed and the construction safety is ensured smoothly.
The conclusions obtained in this paper can provide data support for the support project, and can provide reference for the optimization design of the 0# block of the short tower cable-stayed bridge, the calculation and analysis of the spatial stress and the stress monitoring, which is of great practical significance.
【學(xué)位授予單位】：東北林業(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;U441.5

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