【摘要】：矮塔斜拉橋與常規(guī)斜拉橋和連續(xù)梁橋有很大差異。寬翼緣薄壁箱梁截面的應(yīng)力不符合平截面假定，應(yīng)力沿橫截面分布并不均勻，呈現(xiàn)出剪力滯效應(yīng)。業(yè)者已積極投入到剪力滯效應(yīng)的研究當中，且取得了一定的成果，但很多問題仍沒有得到解決。本文以某大橋為實際工程背景，對矮塔斜拉橋箱梁剪力滯效應(yīng)進行了以下幾個方面的研究： 1、討論了矮塔斜拉橋的發(fā)展歷史、國內(nèi)外的發(fā)展概況及矮塔斜拉橋的特點。 2、論述了剪力滯效應(yīng)的研究狀況并介紹了剪力滯效應(yīng)的各種計算方法及試驗研究情況。 3、對于工程上計算簡單的三桿比擬法，詳細的介紹了該方法求解箱梁剪力滯效應(yīng)的基本思路，根據(jù)邊界條件和荷載情況，最終得到了三桿比擬法求解薄壁箱梁剪力滯效應(yīng)的理論公式，并針對實橋應(yīng)用該方法計算了控制截面的剪力滯系數(shù)。 4、采用有限元分析軟件，建立矮塔斜拉橋最大懸臂施工階段的空間有限元法模型，，分析計算了最大懸臂施工階段主梁的剪力滯效應(yīng)。最后對可能影響箱梁剪力滯效應(yīng)的多種因素如預(yù)應(yīng)力的損失、橫隔板厚度、橫隔板間距等分別建立空間有限元模型，研究這些因素對剪力滯效應(yīng)的影響，得出一定的規(guī)律如下： （1）、預(yù)應(yīng)力損失和橫隔板厚度的變化對頂?shù)装宓募袅?yīng)的影響不顯著，可以不考慮預(yù)應(yīng)力損失和橫隔板厚度的變化對剪力滯系數(shù)的影響 （2）、橫隔板間距的變化不僅影響頂?shù)装鍛?yīng)力的大小，同時也影響剪力滯系數(shù)的大小及其沿橫截面的分布規(guī)律，因此分析截面的剪力滯效應(yīng)不能忽略橫隔板間距變化的影響。
[Abstract]:There are great differences between low tower cable-stayed bridge and conventional cable-stayed bridge and continuous beam bridge. The stress of thin-wall box girder with wide flange does not conform to the assumption of flat section, and the distribution of stress along the cross section is not uniform, showing shear lag effect. The industry has been actively involved in the study of shear lag effect, and has achieved some results, but many problems have not been solved. In this paper, based on a bridge as a practical engineering background, the shear lag effect of box girder of low tower cable-stayed bridge is studied in the following aspects: 1. The development history of low-tower cable-stayed bridge, the general situation of development at home and abroad and the characteristics of low-tower cable-stayed bridge are discussed. 2. The research status of shear lag effect is discussed, and various calculation methods and experimental research of shear lag effect are introduced. 3. For the simple three-bar comparison method in engineering, the basic idea of solving the shear lag effect of box girder by this method is introduced in detail. According to the boundary conditions and load conditions, Finally, the theoretical formula for solving the shear lag effect of thin-wall box girder by three-bar analogy method is obtained, and the shear lag coefficient of the control section is calculated by using this method for the real bridge. 4. The spatial finite element model of the maximum cantilever construction stage of the low tower cable-stayed bridge is established by using the finite element analysis software, and the shear lag effect of the main beam in the maximum cantilever construction stage is analyzed and calculated. Finally, the spatial finite element models are established for many factors that may affect the shear lag effect of box girder, such as the loss of prestress, the thickness of diaphragm, the spacing of diaphragm, etc., and the effects of these factors on shear lag effect are studied. Some laws are obtained as follows: (1) the influence of prestress loss and diaphragm thickness on the shear lag effect of top and bottom plate is not significant. The influence of prestress loss and the change of diaphragm thickness on shear lag coefficient can not be taken into account (2). The change of diaphragm spacing not only affects the stress of roof and bottom plate, At the same time, the shear lag coefficient and its distribution along the cross section are also affected, so the influence of the variation of the spacing of the transverse partition can not be ignored in the analysis of the shear lag effect of the section.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U448.27

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