本文關(guān)鍵詞：連續(xù)梁橋懸臂現(xiàn)澆施工關(guān)鍵技術(shù)與控制方法研究　出處：《東南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 連續(xù)梁橋 懸臂現(xiàn)澆 關(guān)鍵技術(shù) 有限元模擬 參數(shù)敏感性 溫度效應(yīng) 施工控制

【摘要】：近年來隨著我國交通事業(yè)的迅速發(fā)展,橋梁跨徑的不斷增大,預(yù)應(yīng)力混凝土連續(xù)梁橋在橋梁建設(shè)中得到了廣泛的應(yīng)用,懸臂現(xiàn)澆施工也成為現(xiàn)代大跨徑橋梁建設(shè)的主要施工方法。采用懸臂現(xiàn)澆施工的連續(xù)梁橋要經(jīng)歷一個復(fù)雜的施工過程,過程中不僅要確保橋梁建設(shè)進(jìn)度和質(zhì)量,也要保證處于動態(tài)變化中的結(jié)構(gòu)在成橋后滿足線形和受力要求,因此有必要對連續(xù)梁橋懸臂現(xiàn)澆施工關(guān)鍵技術(shù)和控制方法進(jìn)行針對性研究。本文以宿揚(yáng)高速公路白塔河橋?yàn)楣こ瘫尘?首先對連續(xù)梁橋懸臂現(xiàn)澆過程中的臨時固結(jié)技術(shù)、掛籃施工技術(shù)和合攏段施工技術(shù)展開研究,從施工進(jìn)程角度首先介紹了墩梁臨時固結(jié)的布置方式,針對墩頂臨時固結(jié)方式校核精軋螺紋鋼的抗壓性能、錨固長度和支墩混凝土的承壓性能以確保施工過程中的穩(wěn)定性；其后對懸臂澆筑過程中所使用的掛籃分析其選擇機(jī)制和結(jié)構(gòu)構(gòu)造,利用Midas/Civil建立掛籃有限元模型,分析掛籃上橫梁、底籃和吊桿的受力性能,介紹了掛籃預(yù)壓靜載試驗(yàn),并繪制掛籃彈性變形曲線圖為后期計算施工預(yù)拱度作準(zhǔn)備；最后對合攏段臨時固結(jié)、合攏施工溫度和合攏施工配重展開論述。三項(xiàng)重要施工技術(shù)在時間進(jìn)程上涵蓋了橋梁建設(shè)全周期,為保證橋梁施工質(zhì)量和進(jìn)度奠定了基礎(chǔ)。結(jié)合以上連續(xù)梁橋懸臂現(xiàn)澆施工的工藝特點(diǎn),本文選擇正裝分析法對白塔河橋主橋施工過程進(jìn)行模擬。在確定有限元模型的設(shè)計參數(shù)、計算荷載、邊界條件及劃分施工工況后,利用MIDAS/Civil建立了白塔河橋的有限元計算模型,進(jìn)行白塔河橋主橋施工全過程仿真分析,預(yù)測并分析了施工過程中梁段受力和變形。在施工過程模擬有限元分析的基礎(chǔ)上,針對連續(xù)梁橋施工控制過程中可控參數(shù)進(jìn)行了敏感性分析,研究在橋梁建設(shè)過程中對結(jié)構(gòu)擾動較大的因素,以便在施工控制中實(shí)時修正理論模型和反饋控制,分析結(jié)果表明混凝土自重荷載和預(yù)應(yīng)力荷載偏差對橋梁結(jié)構(gòu)在施工階段和成橋階段的結(jié)構(gòu)撓度和應(yīng)力影響較大。由于溫度對混凝土結(jié)構(gòu)的受力和變形同樣存在一定影響,本文在總結(jié)以往箱梁結(jié)構(gòu)溫度分布形式的基礎(chǔ)上將溫度影響劃分為體系溫差和梯度溫差兩種溫度作用形式,介紹了溫度荷載在混凝土內(nèi)部產(chǎn)生兩種溫差應(yīng)力的機(jī)理,然后分析兩種溫差作用對橋梁在施工階段和成橋階段線形和應(yīng)力的影響,為橋梁施工控制中考慮溫度效應(yīng)提供理論依據(jù)�；谏鲜鍪┕た刂茀�(shù)敏感性和溫度效應(yīng)分析結(jié)果,選擇自適應(yīng)控制法建立白塔河橋施工控制體系,具體實(shí)施白塔河橋的線形控制和應(yīng)力監(jiān)控。在線形控制中介紹了立模標(biāo)高設(shè)置原理、全橋高程觀測網(wǎng)布置方法和測量方法,并利用灰色系統(tǒng)理論GM(1,1)模型將理想狀態(tài)和實(shí)測狀態(tài)下的橋面高程差作為灰微分序列建模,預(yù)測待施工階段的偏差并修正立模標(biāo)高,最后白塔河橋順利合攏、線形平順,表明灰色理論預(yù)測控制具有較強(qiáng)的適應(yīng)性和實(shí)用性。在應(yīng)力監(jiān)控中介紹了應(yīng)變計的選擇及工作原理、應(yīng)力測點(diǎn)監(jiān)控網(wǎng)的布置和監(jiān)測方法,應(yīng)力監(jiān)測結(jié)果顯示實(shí)測應(yīng)力與理論應(yīng)力保持一致的規(guī)律性且誤差較小,表明經(jīng)過自適應(yīng)控制的參數(shù)修正和誤差修正,結(jié)構(gòu)理論狀態(tài)和施工實(shí)際狀態(tài)相似程度較高。
[Abstract]:In recent years, with the rapid development of transportation in our country. The increase of the span prestressed concrete continuous girder bridge is widely used in bridge construction, cantilever cast-in-place construction has become the main construction method of long-span bridge construction. The cantilever cast-in-place continuous beam bridge construction is a complex during the construction process, not only to ensure that the progress of bridge construction and quality, but also to ensure that in the dynamic changes in the structure to meet the requirements of linear and stress in the bridge, so it is necessary for the continuous beam cantilever cast-in-place construction key technology and control method for research. This paper places Yang Expressway Bridge as the engineering tower the background, first on the temporary consolidation technology of continuous beam bridge cantilever cast-in-place process, hanging basket construction technology and construction technology of closure segment construction, from the point of the process first introduced the pier beam Layout of the temporary consolidation, the compressive properties of the pier top way to check temporary consolidation bar, anchorage length and pier bearing performance of concrete to ensure stability in the construction process of the hanging basket; then using the cantilever casting process analysis of the selection mechanism and structure, using Midas/Civil to establish the finite element model of the hanging basket analysis on the beam, hanging basket, basket bottom and suspender force performance, introduces the Cradle preloading static load test, and draw the curve of elastic deformation of the hanging basket for later calculation of the camber of construction preparation; at the end of the closure section of temporary consolidation, closure construction temperature and weight closure construction are discussed. Three the important construction technology covers the full cycle of bridge construction in the course of time, it lays a foundation to guarantee the quality of bridge construction and progress. With the above continuous beam cantilever cast-in-place construction technology characteristics, anthology Choose a formal analysis to simulate the construction process of bridge tower load calculation method. The design parameters, determining the finite element model, boundary conditions and division of construction conditions, using MIDAS/Civil to establish the finite element calculation model of the bridge tower, analyze the simulation of the whole process of Baita river bridge main bridge construction, and analyzes the prediction and deformation of girder construction in the process of stress. Based on Simulation of finite element analysis in the construction process, the controllable construction control of the continuous beam bridge parameter sensitivity analysis, perturbation of larger factors on the structure in the bridge construction process, in order to construction control of real time correction model and feedback control, analysis results show that the concrete gravity load and prestress load deviation of bridge structure during the construction period and the stage of bridge structure deflection and stress influence because of the temperature of the concrete structure. The stress and deformation also has certain effect in the previous box girder structure form based on the temperature distribution of temperature effect is divided into system temperature and gradient temperature difference of two kinds of temperature effect, the temperature load creates two kinds of temperature stress in the concrete mechanism, then analyzes the two kinds of temperature effect on the bridge the construction stage and the bridge alignment and stress effects, temperature effects are considered in the construction control of bridge construction to provide the theory basis. The control parameter sensitivity and temperature effect analysis based on the results of selection of adaptive control method to establish the construction control system of Baita River Bridge, Baita bridge concrete implementation of the linear control and stress monitoring in linear control. The elevation of formwork setting principle, full bridge elevation observation network layout method and measurement method, and using the theory of grey system GM (1,1) model of the ideal state The deck elevation and measured under the condition of the poor as the modeling of grey differential sequence, prediction error to the construction phase and correction of formwork elevation, finally Baita bridge successfully, smooth linear, indicate that the grey predictive control theory has strong adaptability and practicability. The stress monitoring was introduced and the working principle of the strain gauge, layout the stress measurement and monitoring method for monitoring network, stress monitoring results show that the measured stress and stress theory to maintain consistent regularity and the error is small, show that the parameter correction and error correction adaptive control theory, structure and construction of the actual state of state of similar degree is high.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U445.4

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