【摘要】：混凝土箱梁因其眾多優(yōu)點而被廣泛應(yīng)用于現(xiàn)代橋梁工程中。由于箱梁截面挖空率及腹板間距大,箱壁薄,在荷載作用下往往會產(chǎn)生較大的橫向內(nèi)力,從而導(dǎo)致部分混凝土箱梁在運營階段出現(xiàn)了明顯的縱向裂縫。因此,混凝土箱梁的橫向內(nèi)力計算已成為橋梁設(shè)計人員所關(guān)心的問題。本文在總結(jié)和完善傳統(tǒng)框架分析的基礎(chǔ)上,針對目前混凝土箱梁橫向內(nèi)力研究中存在的主要問題,從以下幾個方面對單箱單室斜腹板箱梁的橫向內(nèi)力分析進(jìn)行了研究。(1)通過對箱梁橫向內(nèi)力的計算方法進(jìn)行對比分析,進(jìn)一步完善箱梁橫向內(nèi)力分析理論。本文以承受偏心荷載作用的箱梁為模型,基于推廣的“TYL”框架分析理論,提出了一種改進(jìn)的框架分析方法。該方法將箱梁畸變理論與框架分析原理相結(jié)合,通過建立箱梁的畸變位移與框架位移之間的協(xié)調(diào)關(guān)系,推導(dǎo)出計算橫向內(nèi)力所需的基本公式,并將按本文公式求得的橫向內(nèi)力與有限元軟件ANSYS殼單元的分析結(jié)果進(jìn)行了對比,從而驗證了本文方法的適用性及可靠性。通過對比分析本文改進(jìn)的框架法和已有的推廣“TYL”框架法表明,兩種方法的本質(zhì)區(qū)別在于對框架位移的處理方式不同,而本文改進(jìn)的框架法對橫向內(nèi)力的計算結(jié)果明顯優(yōu)于推廣的“TYL”框架法。(2)僅按剛性支承框架分析法計算箱梁的橫向內(nèi)力時不能客觀反映箱梁的實際受力情況,雖然本文改進(jìn)的框架分析法具有良好的精度,但由于考慮了箱梁的畸變效應(yīng),使得計算相當(dāng)繁瑣。為了便于工程應(yīng)用,本文引入了橫向內(nèi)力修正系數(shù),通過這一修正系數(shù)對剛性支承框架法的計算結(jié)果進(jìn)行修正。結(jié)合數(shù)值算例,詳細(xì)分析了豎向偏心荷載位置、箱梁高度、斜腹板傾斜程度以及懸臂板長度等參數(shù)變化對橫向內(nèi)力及其修正系數(shù)的影響規(guī)律。在本文方法與有限元法的橫向內(nèi)力計算結(jié)果的基礎(chǔ)上,給出了箱梁在計算截面上各控制點處橫向修正系數(shù)的合理取值。(3)通過對國內(nèi)幾座已建的混凝土連續(xù)箱梁橋面板橫向內(nèi)力的分析表明,在計算大跨度預(yù)應(yīng)力混凝土箱梁的橫向內(nèi)力時采用現(xiàn)行公路橋梁設(shè)計規(guī)范尚難滿足安全要求,需要通過提高現(xiàn)行規(guī)范中的彈性約束系數(shù)來實現(xiàn)大跨度預(yù)應(yīng)力箱梁橋的安全設(shè)計。
[Abstract]:Concrete box girder is widely used in modern bridge engineering because of its many advantages. Due to the large hollowing rate of the box girder section and the spacing of the web, and the thin wall of the box girder, the transverse internal force is often produced under the action of load, which leads to obvious longitudinal cracks in some concrete box girders in the operation stage. Therefore, the calculation of transverse internal force of concrete box girder has become a concern of bridge designers. On the basis of summarizing and perfecting the analysis of traditional frame, this paper aims at the main problems existing in the research of transverse internal force of concrete box girder. The transverse internal force analysis of single box girder with single box and single chamber inclined web plate is studied from the following aspects. (1) the theory of transverse internal force analysis of box girder is further improved by comparing and analyzing the calculation method of transverse internal force of box girder. In this paper, based on the extended "TYL" frame analysis theory, an improved frame analysis method is proposed based on the model of box girder subjected to eccentric loads. In this method, the distortion theory of box girder is combined with the principle of frame analysis. By establishing the harmonious relation between the distortion displacement of box girder and the displacement of frame, the basic formula for calculating the transverse internal force is derived. The transverse internal force obtained by the formula is compared with the analysis results of the finite element software ANSYS shell element, which verifies the applicability and reliability of this method. By comparing and analyzing the improved frame method and the existing extended "TYL" frame method, it is shown that the essential difference between the two methods lies in the different ways of dealing with the displacement of the frame. The result of the improved frame method is obviously better than that of the extended "TYL" frame method. (2) when calculating the transverse internal force of the box girder only according to the rigid support frame analysis method, it can not objectively reflect the actual force situation of the box girder. Although the improved frame analysis method in this paper has good precision, but the distortion effect of box girder is taken into account, the calculation is rather complicated. In order to facilitate engineering application, the transverse internal force correction coefficient is introduced in this paper, through which the calculation results of rigid support frame method are modified. Combined with numerical examples, the influence of the position of vertical eccentric load, the height of box girder, the inclined degree of inclined web and the length of cantilever plate on the lateral internal force and its correction coefficient are analyzed in detail. Based on the results of the method and the finite element method, The reasonable value of the transverse correction coefficient at each control point of the box girder is given. (3) through the analysis of the transverse internal forces of several concrete continuous box girder bridges built in China, it is shown that, When calculating the transverse internal force of long-span prestressed concrete box girder, it is difficult to meet the safety requirements by using the existing highway bridge design code. It is necessary to achieve the safety design of the long-span prestressed box girder bridge by increasing the elastic constraint coefficient in the current code.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441

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