本文選題：變形監(jiān)測(cè)　切入點(diǎn)：撓度　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：橋梁是交通運(yùn)輸網(wǎng)絡(luò)的重要組成部分。當(dāng)前我國(guó)工程建設(shè)快速發(fā)展。大跨度橋梁層出不窮,對(duì)橋梁工程質(zhì)量水平提出了新的高度和要求。從上世紀(jì)五十年代,鋼材冶煉技術(shù)快速提高,鋼鐵橋梁的建設(shè)取得了極快發(fā)展。目前,國(guó)內(nèi)外鋼結(jié)構(gòu)橋梁的主要結(jié)構(gòu)形式有鋼箱梁結(jié)構(gòu)、大跨度鋼桁梁結(jié)構(gòu)、鋼管或鋼箱拱結(jié)構(gòu)和多種鋼制疊合梁結(jié)構(gòu)等。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(qiáng)度和剛度要求等優(yōu)點(diǎn),成為跨越河流、深溝峽谷的理想橋型。大跨度鋼桁梁橋施工安全監(jiān)測(cè)與分析是連接設(shè)計(jì)與施工的關(guān)鍵步驟,對(duì)橋梁施工安全至關(guān)重要。提高大跨度鋼桁梁橋施工安全監(jiān)測(cè)與分析技術(shù)水平將帶來(lái)巨大的經(jīng)濟(jì)效益和工程價(jià)值。本文結(jié)合具體工程項(xiàng)目,針對(duì)大跨度鋼桁梁橋施工監(jiān)測(cè)過(guò)程,重點(diǎn)分析了大跨度鋼桁梁橋施工過(guò)程的線形與應(yīng)力變化,評(píng)估橋梁安全狀態(tài),建立了橋梁有限元模型,并做了一些優(yōu)化修正。主要內(nèi)容包括:1.大跨度鋼桁梁大橋測(cè)量手段的研究。結(jié)合大跨度鋼桁梁橋的具體情況,將傳統(tǒng)測(cè)量技術(shù)、電子測(cè)量技術(shù)、自動(dòng)化測(cè)量技術(shù)綜合比較,分析不同測(cè)量手段的優(yōu)劣,依據(jù)“優(yōu)劣互補(bǔ)、精確可靠”的原則選擇測(cè)量手段。2.鋼桁梁橋的施工監(jiān)測(cè)方案概括總結(jié)。結(jié)合國(guó)內(nèi)外鋼桁梁工程的發(fā)展?fàn)顩r,對(duì)大跨度鋼桁梁施工監(jiān)控的理論、原則、方法、目的等做了簡(jiǎn)要概述。結(jié)合項(xiàng)目具體情況制訂了施工監(jiān)測(cè)方案,對(duì)監(jiān)測(cè)過(guò)程中的幾個(gè)重要參數(shù)進(jìn)行了測(cè)量數(shù)據(jù)分析研究。3.運(yùn)用有限元法,建立有效的全橋有限元模型。通過(guò)使用大型通用有限元軟件ABAQUS/Standard對(duì)橋梁落架、旋轉(zhuǎn)、平移、落梁各階段做了應(yīng)力和線形變化分析,結(jié)合精確的測(cè)量手段達(dá)到安全監(jiān)測(cè)的目的。模型修正后能在誤差允許范圍內(nèi)提供橋梁形態(tài)變化預(yù)測(cè),推演鋼桁梁橋在落架工況下?lián)隙茸兓�。結(jié)果顯示,該模型能較好預(yù)測(cè)自然條件下鋼桁梁撓度變化,符合實(shí)際變化規(guī)律,從而對(duì)確保施工安全有較大幫助。
[Abstract]:Bridge is an important part of transportation network. At present, the rapid development of engineering construction in China, the emergence of long-span bridges in endlessly, put forward a new height and requirements for the quality level of bridge engineering. Since -50s, At present, the main structural forms of steel bridge at home and abroad include steel box girder structure, large span steel truss beam structure. Steel tube or steel box arch structure and a variety of steel composite beam structures, among which large steel truss girder bridge structure has become a cross river because of its advantages of good force, light weight, high strength and rigidity, etc. The construction safety monitoring and analysis of long span steel truss girder bridge is the key step of connecting design and construction. It is of great importance to bridge construction safety. Improving the technical level of construction safety monitoring and analysis of long-span steel truss bridge will bring great economic benefits and engineering value. Combined with specific project, this paper aims at the construction monitoring process of long-span steel truss bridge. In this paper, the linear and stress changes of long span steel truss bridge are analyzed, the safety state of the bridge is evaluated, and the finite element model of the bridge is established. Some optimization amendments are made. The main contents include: 1. Research on measuring means of long span steel truss bridge. Combined with the concrete situation of long span steel truss bridge, the traditional measurement technology, electronic measurement technology and automatic measurement technology are compared. This paper analyzes the merits and demerits of different measuring methods, selects the measuring means according to the principle of "complementary advantages and disadvantages, accurate and reliable", summarizes the construction monitoring scheme of steel truss bridge, and combines the development of steel truss beam engineering at home and abroad. In this paper, the theory, principle, method and purpose of construction monitoring of large-span steel truss beam are briefly summarized. In this paper, some important parameters in the monitoring process are analyzed and studied. 3. Using finite element method, an effective finite element model of the bridge is established. By using the large-scale universal finite element software ABAQUS/Standard, the bridge falls, rotates, and moves the bridge. The stress and linear variation of the falling beam are analyzed, and the safety monitoring is achieved by means of accurate measurement. The modified model can provide the prediction of the bridge shape change within the allowable error range. The results show that the model can predict the deflection change of steel truss beam under natural conditions, which is in line with the actual variation law, and thus has great help to ensure the construction safety.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U446

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