【摘要】：橋梁是指跨越天然或人工障礙而修建的建筑物,隨著科學(xué)技術(shù)的發(fā)展,越來越多組合體系結(jié)構(gòu)在現(xiàn)代橋型中得到應(yīng)用。系桿拱連續(xù)梁做為結(jié)合了梁橋與拱橋各自優(yōu)點的橋型,在受力方面的優(yōu)點得以充分發(fā)揮,呈現(xiàn)出優(yōu)良、穩(wěn)定的經(jīng)濟指標(biāo)和美觀的外型。雖然梁拱組合體系橋梁具有諸多優(yōu)點,但對于其橋型的研究和探討并不完善,許多問題正在被中外學(xué)者所研究發(fā)現(xiàn)。溫度效應(yīng),做為近年來越來越受到廣泛關(guān)注的問題,自上世紀六十年代就有學(xué)者對其進行研究,溫度所產(chǎn)生的應(yīng)力有時甚至可以與外荷載相當(dāng),溫度作用會直接影響橋梁的安全性。為驗證溫度對系桿拱連續(xù)梁的影響,本論文以實際工程為背景,對混凝土系桿拱連續(xù)梁橋進行現(xiàn)場溫度試驗。在系桿及吊桿周圍布置溫度測點,對測點進行連續(xù)7d的溫度測量,觀測內(nèi)容包括系桿豎向及橫向測點的溫度變化規(guī)律和吊桿周圍的溫度變化規(guī)律,并通過對系桿溫度的觀察,利用半經(jīng)驗半理論公式對系桿豎向及橫向的溫度梯度進行擬合,最終根據(jù)已求出的溫度梯度曲線,將非線性溫度梯度等效為線性溫度梯度,以溫度荷載的形式施加在全橋MIDAS有限元模型中,以研究溫度對系桿拱連續(xù)梁的影響。本論文首先詳細闡述了橋梁結(jié)構(gòu)溫度場的分析理論和計算方法；溫度作用的分類及其對橋梁結(jié)構(gòu)的影響；并介紹溫度效應(yīng)的計算理論及各國規(guī)范關(guān)于溫度梯度的規(guī)定。然后通過對現(xiàn)場實測溫度數(shù)據(jù)分析,得出系桿及吊桿的溫度分布規(guī)律;并選用指數(shù)函數(shù)對系桿豎向和橫向的最不利溫度分布進行擬合,確定系桿的溫度梯度曲線。最后利用該橋有限元模型在豎向溫度梯度、橫向溫度梯度及其組合的作用下,通過對控制截面的內(nèi)力和應(yīng)力的分析,發(fā)現(xiàn)由溫度梯度產(chǎn)生的溫度應(yīng)力、溫度變形都不容忽視；并將豎向溫度梯度與規(guī)范規(guī)定的溫度梯度進行了溫度效應(yīng)的比較,發(fā)現(xiàn)在擬合出的溫度梯度效應(yīng)下,系桿控制截面的應(yīng)力小于規(guī)范溫度梯度效應(yīng)下的數(shù)值。
[Abstract]:Bridges refer to buildings built across natural or man-made obstacles. With the development of science and technology, more and more composite structures have been applied in modern bridge types. Although the beam-arch composite system bridge has many advantages, its research and discussion are not perfect. Many problems are being found by scholars at home and abroad. Temperature effect, as a problem which has attracted more and more attention in recent years, has been studied by scholars since the 1960s. In order to verify the influence of temperature on tied-arch continuous girder, the field temperature test of concrete tied-arch continuous girder bridge is carried out under the background of practical engineering. The temperature measurement points are arranged around tied-arch and suspender to connect the measured points. The temperature measurement for the next 7 days includes the temperature variation law of the vertical and transverse measuring points of the tie bar and the temperature variation law around the hanger bar. Through the observation of the tie bar temperature, the vertical and transverse temperature gradients of the tie bar are fitted by semi-empirical and semi-theoretical formulas, and the nonlinear temperature is finally fitted according to the obtained temperature gradient curve. Degree gradient is equivalent to linear temperature gradient, which is applied to the MIDAS finite element model of the whole bridge to study the effect of temperature on the tied arch continuous beam. The calculation theory of effect and the stipulation of temperature gradient in the codes of other countries are given. Then the temperature distribution law of tie rod and hanger rod is obtained by analyzing the measured temperature data in situ. The exponential function is used to fit the most disadvantageous temperature distribution of tie rod vertically and horizontally, and the temperature gradient curve of tie rod is determined. Under the action of vertical temperature gradient, transverse temperature gradient and their combination, through the analysis of the internal force and stress of the control section, it is found that the temperature stress and deformation caused by the temperature gradient can not be ignored; and the temperature effect of the vertical temperature gradient is compared with the temperature gradient stipulated in the code, and it is found that the temperature is fitted out. Under the gradient effect, the stress of the control section of the tie bar is less than that of the normal temperature gradient effect.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441

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