本文選題：懸索橋 + 施工監(jiān)控��； 參考：《湖北工業(yè)大學(xué)》2014年碩士論文

【摘要】：改革開放以來,我國橋梁建設(shè)水平特別是大中型橋梁方面取得了驚人的發(fā)展。大型橋梁雖然已經(jīng)有很多例子,但是關(guān)于大型橋梁施工監(jiān)控和有限元分析技術(shù)卻還有值得完善和深入研究的必要。為了確保橋梁結(jié)構(gòu)的安全,提高施工質(zhì)量以及為同類橋梁施工監(jiān)控研究提供必要的參考。 本文以某大型懸索橋作為分析對象。詳細(xì)介紹了問題提出的國內(nèi)外背景,懸索橋發(fā)展現(xiàn)狀,懸索橋主要特點(diǎn)及其將來發(fā)展趨勢,橋梁施工中施工監(jiān)控的重要性,橋梁施工中施工控制內(nèi)容及其方法,對影響橋梁施工中施工監(jiān)控的因素作了詳細(xì)分析。具體闡述了本大型懸索橋施工中的施工監(jiān)控及有限元分析,本論文用目前流行的MIDASICIVIL軟件對本橋進(jìn)行有限元模型模擬,建立了全橋整體模型,計(jì)算施工過程中各個(gè)施工階段的結(jié)構(gòu)撓度、內(nèi)力、線形等,為應(yīng)力測量和線形控制提供理論計(jì)算值及結(jié)構(gòu)狀態(tài)預(yù)期。 本文研究過程基于施工監(jiān)控對澆筑混凝土方量監(jiān)測、支架變形監(jiān)測、橋面堆載監(jiān)測和預(yù)應(yīng)力張拉監(jiān)測、塔梁變形監(jiān)測、拉索索力監(jiān)測、塔梁應(yīng)力監(jiān)測、溫度場監(jiān)測等。有限元分析計(jì)算工況根據(jù)橋梁的施工步驟具體劃分,施工階段主要可劃分為橋塔施工、混凝土主梁現(xiàn)澆、貓道施工、鞍座就位、主纜架設(shè)、索夾安裝、吊索安裝并張拉、拆除貓道階段、橋面鋪裝及附屬設(shè)施施工、運(yùn)營階段;計(jì)算內(nèi)容包括加勁梁預(yù)拋高計(jì)算,吊索分級張拉順序確定及張拉應(yīng)力計(jì)算(吊索張拉過程中,主纜線形和主梁縱梁變形、應(yīng)力均將產(chǎn)生相應(yīng)的變化,經(jīng)計(jì)算確定吊索張拉順序、張拉力大小,保證張拉過程主梁縱梁的應(yīng)力不超過最大值,成橋后梁、塔、內(nèi)力及主纜線形符合設(shè)計(jì)規(guī)定),各施工階段主纜軸力和線形計(jì)算,各施工階段加勁梁內(nèi)力和線形計(jì)算,各施工階段主塔內(nèi)力和塔頂偏位計(jì)算,索塔、主梁壓縮補(bǔ)償量計(jì)算,鞍座預(yù)偏值、頂推值計(jì)算,本文僅對索塔、主梁和主纜進(jìn)行監(jiān)控分析。 將施工監(jiān)測過程中實(shí)測值與有限元理論計(jì)算值進(jìn)行對比研究,可以驗(yàn)證本次模擬計(jì)算的準(zhǔn)確性與合理性,同時(shí)證明該橋施工及監(jiān)控方法安全可靠。該大型懸索橋施工工藝特別,它的施工工藝、施工監(jiān)控實(shí)測資料與模擬計(jì)算資料的分析對比方法和有限元方法模擬成果,能夠?yàn)橄嗤愋蜆蛄菏┕けO(jiān)控提供一定的借鑒。
[Abstract]:Since the reform and opening up, the level of bridge construction, especially the large and medium-sized bridges, has made remarkable development. Although there are many examples of large bridge construction monitoring and finite element analysis are still worthy of further study. In order to ensure the safety of bridge structure, improve the construction quality and provide necessary reference for the similar bridge construction monitoring research. This paper takes a large suspension bridge as an analysis object. This paper introduces in detail the domestic and foreign background of the problems raised, the present situation of the suspension bridge development, the main characteristics of the suspension bridge and its future development trend, the importance of the construction monitoring in the bridge construction, the construction control content and the methods in the bridge construction. The factors influencing the construction monitoring in bridge construction are analyzed in detail. The construction monitoring and finite element analysis in the construction of the large suspension bridge are expounded in detail. The finite element model of the bridge is simulated by the popular Midas software in this paper, and the whole bridge model is established. The deflection, internal force and shape of the structure in each construction stage are calculated, which provide theoretical calculation value and structure state expectation for stress measurement and linear control. The research process of this paper is based on the construction monitoring to monitoring the quantity of pouring concrete, the deformation monitoring of support, the monitoring of bridge deck load and prestressed tensioning, the deformation monitoring of tower beam, the monitoring of cable force, the stress monitoring of tower beam, the monitoring of temperature field, and so on. According to the concrete construction steps of the bridge, the working conditions of finite element analysis and calculation can be divided into three parts: bridge tower construction, concrete main beam cast-in-situ, catwalk construction, saddle position, main cable erection, cable clamp installation, sling installation and tension, In the phase of removing the catwalk, the bridge deck paving and ancillary facilities are being constructed, and the operation stage; the calculation includes the calculation of the pre-throwing height of the stiffened beam, the determination of the tension sequence of the slings and the calculation of the tensile stress (during the stretching of the slings, the deformation of the main cable line and the longitudinal beam of the main beam, The stress will be changed accordingly. The tension sequence and tension force of the sling will be determined by calculation to ensure that the stress of the longitudinal beam of the main beam does not exceed the maximum value during the tensioning process, and the rear beam and tower of the bridge are formed. The internal force and the shape of the main cable conform to the design regulations), the axial force and the line shape of the main cable are calculated in each construction stage, the internal force and the linear shape of the stiffened beam in each construction stage, the internal force and the top deviation of the tower in each construction stage, the compression compensation amount of the cable tower and the main beam, In this paper, only cable tower, main beam and cable are monitored and analyzed. The accuracy and rationality of the simulation calculation can be verified by comparing the measured values with the calculated values of finite element theory in the course of construction monitoring. At the same time, it is proved that the bridge construction and monitoring method is safe and reliable. The construction technology of the large suspension bridge is very special, its construction technology, the analysis and comparison of the measured data of construction monitoring and the simulated calculation data and the simulation results of the finite element method can provide some reference for the construction monitoring of the same type of bridge.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.25;U445.4

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相關(guān)期刊論文 前10條

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本文編號：2080373