發(fā)布時間：2018-01-05 19:40

  本文關(guān)鍵詞：混凝土箱梁溫度場試驗及溫度效應(yīng)理論研究　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混凝土箱梁 日照 溫度場 溫度應(yīng)力

【摘要】：混凝土箱形結(jié)構(gòu)中因為材料的傳熱性能較差，在日照作用下結(jié)構(gòu)中就會形成較大的溫差荷載，產(chǎn)生的溫差荷載所帶來的溫度應(yīng)力是造成混凝土箱梁開裂的重要因素之一。因為混凝土傳熱問題的復(fù)雜性，在現(xiàn)有的混凝土橋梁設(shè)計中，有關(guān)的理論和計算方法存在一定的缺陷，做了很大程度的簡化，然而采用這種經(jīng)過簡化的計算模型和方法，會使溫度荷載的取值以及溫度應(yīng)力的計算結(jié)果與實際情況之間出現(xiàn)較大的不符。本文從計算理論入手，對混凝土箱梁結(jié)構(gòu)日照溫度場及其效應(yīng)進(jìn)行了深入的研究，，對計算理論和方法進(jìn)行了完善和改進(jìn)，對日照溫度荷載的取值進(jìn)行了分析和探討。 文章以廣西桂林地區(qū)貴光線幸福源水庫雙線特大橋為工程背景，選取該橋連續(xù)剛構(gòu)段單室箱梁截面為研究對象，作了如下研究： （1）對課題組進(jìn)行溫度場現(xiàn)場實測的試驗儀器和測定方法作了詳細(xì)說明，通過分析連續(xù)高溫天氣下測得的溫度場數(shù)據(jù)，提出了箱梁頂板、腹板、底板的日照溫度場特征。 （2）研究了混凝土箱梁結(jié)構(gòu)在日照作用下與周圍介質(zhì)之間的傳熱機(jī)理，系統(tǒng)地闡釋了其在熱量傳遞過程中的邊界條件，建立了可以反映實際復(fù)雜邊界條件情況的溫度響應(yīng)的數(shù)值分析計算模型。 （3）收集整理了計算混凝土單室箱梁結(jié)構(gòu)壁板內(nèi)部日照溫度分布的解析方法，該方法假定沿混凝土結(jié)構(gòu)壁板厚度方向的溫度分布具有一維周期性特征，通過對傳統(tǒng)的一維熱傳導(dǎo)微分方程進(jìn)行數(shù)值求解，最終得到傅里葉級數(shù)形式的壁板內(nèi)溫度場解析解表達(dá)式，在應(yīng)用中取該解析解的少數(shù)幾項即可得到足夠精確的結(jié)果。 （4）在實測溫度數(shù)據(jù)的基礎(chǔ)上，擬合得到了該地區(qū)混凝土箱梁在太陽輻射作用下的最不利溫度荷載取值，并與我國現(xiàn)行鐵路橋梁設(shè)計規(guī)范中的溫度荷載取值進(jìn)行了對比分析，提出了在溫度荷載取值上的看法和建議。 （5）采用合理的假定條件建立了與實際情況相符的計算模型，研究了混凝土箱梁結(jié)構(gòu)溫度應(yīng)力的理論計算方法，該方法將復(fù)雜的三維空間問題轉(zhuǎn)化為二維平面問題進(jìn)行分析，并考慮由于泊松效應(yīng)引起的各應(yīng)力分量間的耦合作用，在實際計算中運(yùn)用結(jié)構(gòu)力學(xué)方法即可實現(xiàn)考慮應(yīng)力分量之間耦合關(guān)系的三維溫度應(yīng)力空間分析。結(jié)合本文工程背景數(shù)據(jù)，該方法的計算結(jié)果與傳統(tǒng)計算方法相比，其精度明顯提高。 （6）對溫度裂縫的成因進(jìn)行了詳細(xì)分析，根據(jù)裂縫形成的原因提出了橋梁在設(shè)計階段和施工階段相應(yīng)的預(yù)防控制措施。
[Abstract]:Because of the poor heat transfer performance of the material in the concrete box structure, large temperature difference load will be formed in the structure under the action of sunlight. The temperature stress caused by the temperature difference load is one of the important factors that cause the cracking of concrete box girder. Because of the complexity of the concrete heat transfer problem, it is in the existing concrete bridge design. There are some defects in the theory and calculation method, which is simplified to a great extent. However, the simplified calculation model and method are adopted. It will make the value of temperature load and the calculation result of temperature stress to appear a big discrepancy with the actual situation. This paper starts with the theory of calculation. In this paper, the temperature field of concrete box girder structure and its effect are studied deeply, the calculation theory and method are improved and the value of sunshine temperature load is analyzed and discussed. In this paper, the section of single-chamber box girder in continuous rigid frame section of Guiliangyuan Reservoir in Guilin, Guangxi is selected as the research object, and the following research is done: 1) the test instrument and measurement method of the field temperature field measured by the research group are explained in detail. By analyzing the data of the temperature field measured under the continuous high temperature weather, the top plate and web plate of the box girder are put forward. The characteristics of sunshine temperature field of the bottom plate. 2) the heat transfer mechanism between the concrete box girder structure and the surrounding medium is studied, and the boundary conditions in the heat transfer process are explained systematically. A numerical model for calculating the temperature response of complex boundary conditions is established. The analytical method for calculating the sunshine temperature distribution in concrete single chamber box girder structure is collected and sorted out. The method assumes that the temperature distribution along the thickness direction of concrete structure wall plate has one-dimensional periodicity. Through the numerical solution of the traditional one-dimensional heat conduction differential equation, the analytic expression of the temperature field in the panel is obtained in the form of Fourier series. A few terms of the analytical solution can be obtained with sufficient accuracy in application. Based on the measured temperature data, the most unfavorable temperature load of concrete box girder in this area under solar radiation is obtained by fitting. In addition, this paper compares and analyzes the values of temperature load in the current design code of railway bridges in China, and puts forward some opinions and suggestions on the value of temperature load. 5) the calculation model of concrete box girder structure is established with reasonable assumptions, and the theoretical calculation method of temperature stress of concrete box girder structure is studied. In this method, the complex three-dimensional space problem is transformed into a two-dimensional plane problem, and the coupling between the stress components caused by the Poisson effect is considered. In the actual calculation, the structural mechanics method can be used to realize the three-dimensional thermal stress space analysis considering the coupling relationship between the stress components, combined with the engineering background data in this paper. Compared with the traditional method, the accuracy of the method is improved obviously. 6) the causes of temperature cracks are analyzed in detail, and the corresponding prevention and control measures in the design and construction stages are put forward according to the reasons for the formation of the cracks.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 田楊;夏招廣;;薄壁箱型梁橋日照溫度場的數(shù)值計算分析[J];四川建筑科學(xué)研究;2009年02期

2 褚強(qiáng);程海根;;自然環(huán)境下混凝土箱梁橫截面溫度場理論及試驗研究[J];高速鐵路技術(shù);2011年05期

3 張亮亮;楊磊;楊轉(zhuǎn)運(yùn);趙艷青;劉會;;大跨混凝土箱梁溫度場分析[J];土木建筑與環(huán)境工程;2011年01期

4 鄒亞蘭;新《橋規(guī)》縱向自約溫度應(yīng)力計算方法的探討[J];橋梁建設(shè);1990年01期

5 盛術(shù)學(xué);;典型箱梁溫度場分布規(guī)律的現(xiàn)場測試及分析[J];太原科技;2010年03期

6 彭友松;朱曉文;強(qiáng)士中;;混凝土箱梁溫度應(yīng)力三維分析[J];鐵道學(xué)報;2009年03期

7 劉興法;預(yù)應(yīng)力混凝土箱梁溫度應(yīng)力計算方法[J];土木工程學(xué)報;1986年01期

8 肖建莊;宋志文;趙勇;錢岳紅;;基于氣象參數(shù)的混凝土結(jié)構(gòu)日照溫度作用分析[J];土木工程學(xué)報;2010年04期

9 彭友松;強(qiáng)士中;;混凝土橋梁結(jié)構(gòu)溫度自應(yīng)力計算方法探討[J];西南交通大學(xué)學(xué)報;2006年04期

10 沈典棟;王解軍;;連續(xù)剛構(gòu)橋箱形墩與箱梁溫度場實測研究[J];公路工程;2011年04期

本文編號：1384573