本文關(guān)鍵詞： 大跨度 鋼桁梁橋 應(yīng)力分析 施工監(jiān)控　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：大跨度鋼結(jié)構(gòu)橋梁的施工方法有多種形式,應(yīng)根據(jù)橋梁的結(jié)構(gòu)形式、跨度大小、施工環(huán)境等因素綜合選擇合適的方法,以達(dá)到施工方便、降低造價、減少工期、安全可靠等綜合經(jīng)濟(jì)效益良好的目的,其中頂推法施工具有不影響橋位處交通狀況、少施工設(shè)備、有利于生產(chǎn)組織、安全可靠和縮短施工工期等優(yōu)點成為大跨度鋼結(jié)構(gòu)橋梁常用的施工方法之一。其中大型鋼桁梁橋結(jié)構(gòu)以其受力好、質(zhì)量輕,滿足較高強度和剛度要求等優(yōu)點,成為跨越河流、深溝峽谷的理想橋型。但在頂推施工過程中主梁的受力遠(yuǎn)較采用其他常規(guī)的施工方法復(fù)雜,有必要對施工過程進(jìn)行準(zhǔn)確的模擬。 本文以黃韓侯鐵路156m鋼桁梁橋為背景,對該橋頂推法施工過程的應(yīng)力及變形的監(jiān)控工作進(jìn)行研究。采用了有限元軟件MIDAS建立全橋?qū)嶓w模型,分析鋼桁梁橋頂推施工的全過程,對鋼桁梁橋在頂推施工過程的受力與變形進(jìn)行仿真模擬計算分析,為類似工程建設(shè)提供一定的參考。為了確保橋梁的施工安全以及保證大跨鋼桁梁橋梁線型和應(yīng)力滿足設(shè)計要求,根據(jù)施工控制和實際施工的需要對鋼桁梁橋頂推施工控制的技術(shù)進(jìn)行研究。 文中介紹了頂推施工發(fā)展?fàn)顩r,并對鋼桁梁橋梁的施工監(jiān)控理論方法以及目的和原則進(jìn)行了簡要的闡述。然后通過使用MIDAS有限元分析軟件對橋梁頂推施工過程各階段的應(yīng)力和變形狀態(tài)進(jìn)行了數(shù)值分析。有限元分析的主要內(nèi)容包括橋梁主梁、桁架的應(yīng)力和線型變化規(guī)律。同時采用應(yīng)力傳感器對橋梁頂推施工過程進(jìn)行了應(yīng)力測量。通過對MIDAS計算結(jié)果和實測值的分析比較,二者數(shù)據(jù)基本保持一致。在實際施工過程中,施工控制人員通過計算結(jié)果和實際測量值之間的比較,能夠及時發(fā)現(xiàn)問題,為下一階段的安全施工提供可行的意見,達(dá)到了施工監(jiān)控的目的,從而保障了該大跨度橋梁的安全施工。
[Abstract]:There are many kinds of construction methods for long-span steel bridges. According to the structural form, span size, construction environment and other factors, the appropriate method should be comprehensively selected, in order to achieve the convenience of construction, reduce the cost and reduce the duration of the project. The safety and reliability of the purpose of comprehensive economic benefits such as good, one of the thrust method construction has no impact on the traffic situation at the bridge, less construction equipment, is conducive to production organization. The advantages of safety and reliability and shortening the construction period have become one of the commonly used construction methods of long-span steel bridge, among which the large steel truss bridge structure has the advantages of good force, light weight, high strength and stiffness requirements, and so on. It is an ideal bridge type to cross rivers and deep gully canyons, but the force of the main beam in the process of pushing construction is much more complicated than that of other conventional construction methods, so it is necessary to simulate the construction process accurately. Based on the 156m steel truss bridge of Huanghanhou railway, this paper studies the monitoring of stress and deformation during the construction process of the bridge by pushing method. The finite element software MIDAS is used to establish the solid model of the whole bridge. The whole process of jacking construction of steel truss bridge is analyzed, and the force and deformation of steel truss bridge in the process of jacking construction are simulated and calculated. In order to ensure the safety of the bridge construction and ensure that the long span steel truss bridge line and stress meet the design requirements. According to the need of construction control and actual construction, the construction control technology of steel truss bridge is studied. In this paper, the development of pushing construction is introduced. The construction monitoring theory method, purpose and principle of steel truss bridge are briefly expounded. Then, the stress and deformation state of each stage of bridge jacking construction is analyzed by using MIDAS finite element analysis software. The main contents of the finite element analysis include the main beam of the bridge. At the same time, stress sensor is used to measure the stress of the bridge jacking construction process. Through the analysis and comparison of the MIDAS calculation results and the measured values. In the actual construction process, the construction controller can find the problem in time by comparing the calculated results with the actual measured values. It provides feasible opinions for the next stage of safe construction, achieves the purpose of construction monitoring, and thus ensures the safe construction of the long-span bridge.
【學(xué)位授予單位】：蘭州交通大學(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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