發(fā)布時(shí)間：2019-06-17 21:44

【摘要】：鋼管混凝土拱橋是一類將梁和拱有機(jī)結(jié)合起來(lái)的橋梁結(jié)構(gòu),該結(jié)構(gòu)體系近年來(lái)才在我國(guó)興起。在施工過(guò)程中主梁與拱肋的線形及內(nèi)力、混凝土澆筑時(shí)鋼管的溫度應(yīng)力、吊桿的索力值均需要建立合適的施工監(jiān)控體系來(lái)加以控制。本文以牟家村跨同三高速公路64m系桿拱橋?yàn)楣こ瘫尘?結(jié)合現(xiàn)有施工監(jiān)控的理論和方法,對(duì)各施工階段橋梁的狀態(tài)進(jìn)行了數(shù)據(jù)采集及分析,保證了橋梁成橋后線形、應(yīng)力及吊桿索力符合規(guī)范要求。主要完成的工作內(nèi)容如下:(1)采用橋梁博士對(duì)全橋進(jìn)行了有限元模擬,得到各階段主梁與拱肋的理論累計(jì)位移,將計(jì)算結(jié)果與設(shè)計(jì)資料對(duì)比,驗(yàn)證了模型的可靠性,在施工過(guò)程中,根據(jù)現(xiàn)場(chǎng)材料試驗(yàn)及實(shí)測(cè)數(shù)據(jù),對(duì)模型中各參數(shù)進(jìn)行調(diào)整,以提高控制精度。(2)采用自適應(yīng)度方法對(duì)橋梁進(jìn)行線形監(jiān)控,利用最小二乘法對(duì)橋梁主要參數(shù)進(jìn)行識(shí)別,并對(duì)橋梁各階段變形進(jìn)行預(yù)測(cè),結(jié)合有限元模型給出主梁與拱肋的預(yù)拱度,確定立模標(biāo)高,得到了理想的成橋線形。(3)分析了施工控制中影響應(yīng)力控制的因素,對(duì)溫度及收縮徐變的影響進(jìn)行了論述,采用收縮徐變相關(guān)理論,對(duì)實(shí)測(cè)應(yīng)變中的非荷載應(yīng)變進(jìn)行分離,得到更接近實(shí)際應(yīng)力的應(yīng)力檢測(cè)結(jié)果。(4)采用MIDAS/FEA有限元軟件對(duì)鋼管混凝土拱肋進(jìn)行有限元模擬,分析在澆筑混凝土過(guò)程中,釋放的水化熱以及對(duì)鋼管拱肋的影響。結(jié)果表明,鋼管混凝土拱澆筑過(guò)程中會(huì)釋放大量的水化熱,具有大體積混凝土溫度場(chǎng)的特征。(5)吊桿的索力直接影響著整個(gè)橋梁的受力狀態(tài),因而對(duì)吊桿索力的識(shí)別至關(guān)重要。選擇合適的實(shí)用公式對(duì)本橋的吊桿索力進(jìn)行識(shí)別,并利用影響矩陣法對(duì)本橋吊索進(jìn)行精確調(diào)整,成橋后索力誤差小于5%,證明了影響矩陣法調(diào)索的有效性。
[Abstract]:Concrete-filled steel tubular arch bridge is a kind of bridge structure which combines beam and arch organically, and the structure system has only emerged in our country in recent years. In the construction process, the alignment and internal force of the main beam and arch ribs, the temperature stress of the steel pipe and the cable force of the suspender should be controlled by establishing a suitable construction monitoring system to control the temperature stress of the steel pipe and the cable force of the suspender during concrete pouring. In this paper, taking the 64m tied arch bridge of Moujiacun Tongshan Expressway as the engineering background, combined with the existing construction monitoring theories and methods, the data acquisition and analysis of the state of the bridge in each construction stage are carried out to ensure that the bridge alignment, stress and suspender cable force meet the requirements of the code. The main contents are as follows: (1) the finite element simulation of the whole bridge is carried out by Dr. Bridge, and the theoretical cumulative displacement of the main beam and arch ribs is obtained. The calculated results are compared with the design data to verify the reliability of the model. In the construction process, according to the field material test and measured data, the parameters in the model are adjusted. In order to improve the control accuracy. (2) the adaptive method is used to monitor the bridge alignment, the least square method is used to identify the main parameters of the bridge, and the deformation of each stage of the bridge is predicted. Combined with the finite element model, the pre-arch degree of the main beam and arch ribs is given, the vertical mold standard height is determined, and the ideal bridge alignment is obtained. (3) the factors affecting stress control in construction control are analyzed. The influence of temperature and shrinkage creep is discussed. The non-load strain in the measured strain is separated by using the theory of shrinkage creep, and the stress detection results which are closer to the actual stress are obtained. (4) the finite element simulation of concrete-filled steel tubular arch ribs is carried out by using MIDAS/FEA finite element software, and the hydration heat released and the influence on steel tube arch ribs in the process of pouring concrete are analyzed. The results show that a large amount of hydration heat will be released during the pouring process of concrete-filled steel tubular arch, which has the characteristics of mass concrete temperature field. (5) the cable force of the suspender directly affects the stress state of the whole bridge, so it is very important to identify the cable force of the suspender. The suitable practical formula is selected to identify the cable force of the suspender of the bridge, and the influence matrix method is used to accurately adjust the cable of the bridge. The cable force error is less than 5% after the bridge is completed, which proves the effectiveness of the influence matrix method to adjust the cable.
【學(xué)位授予單位】：煙臺(tái)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.4

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