本文選題：Π形主梁　切入點：剪力滯　出處：《廣西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文基于剪力滯效應(yīng)的分析理論,結(jié)合Reissner能量變分法的原理,假定翼板的縱向位移為四次拋物線形式,對n形主梁的剪力滯效應(yīng)進(jìn)行了理論研究,推導(dǎo)了不同邊界條件下的剪力滯效應(yīng)計算公式。從研究結(jié)果中可知,邊界條件、荷載形式、主梁截面、主梁寬度等會對n形主梁的剪力滯效應(yīng)產(chǎn)生一定的影響。 為了探究斜拉橋∏形主梁在施工與成橋階段的剪力滯效應(yīng),以對斜拉橋∏形主梁的施工與監(jiān)控提供有效的參考意見,本文根據(jù)有限單元法的基本理論,利用有限元程序MIDAS建立了本文依托工程——針魚嶺大橋的有限元模型,分析了其分布規(guī)律。從分析結(jié)果可以看出,任一塊主梁施工完成后,除了0號塊與該塊主梁及其附近梁段,中間梁段的剪力滯效應(yīng)變化平緩；成橋階段的剪力滯系數(shù)比施工階段較小,其剪力滯分布規(guī)律變化不大；不論施工階段與成橋階段均有負(fù)剪力滯現(xiàn)象出現(xiàn)。 根據(jù)文中對n形主梁剪力滯效應(yīng)的理論分析結(jié)果,為了對斜拉橋n形主梁的優(yōu)化設(shè)計提供依據(jù),本文利用有限單元法研究了翼板的懸臂板長度與翼板厚度對斜拉橋∏形主梁的剪力滯影響。結(jié)果顯示,隨著翼板的懸臂板長度的增加,對剪力滯效應(yīng)的縱向分布影響不大,并且除了主梁末端及其附近梁段,其他梁段的剪力滯系數(shù)沿橫向均在減��；隨著翼板厚度的增加,對剪力滯效應(yīng)的縱橫向分布影響均比較明顯。
[Abstract]:Based on the analysis theory of shear lag effect and the principle of Reissner energy variational method, the longitudinal displacement of airfoil is assumed to be a fourth parabola form, and the shear lag effect of n-shaped main beam is studied theoretically in this paper. The formulas for calculating shear lag effect under different boundary conditions are derived. From the results of the study, it can be seen that boundary conditions, load forms, main beam section and beam width will have certain influence on the shear lag effect of n-shaped main beam. In order to probe into the shear lag effect of the 蟺 shape main girder of cable-stayed bridge in the stage of construction and completion, and to provide an effective reference for the construction and monitoring of the 蟺 shape main girder of cable-stayed bridge, this paper is based on the basic theory of finite element method. By using finite element program MIDAS, the finite element model of this project-Jiyuling Bridge is established, and its distribution law is analyzed. It can be seen from the analysis result that after the construction of any main beam, except block 0 and the section of the main beam and its adjacent beam, The shear lag effect of the middle beam section changes slowly, the shear lag coefficient of the bridge stage is smaller than that of the construction stage, and the distribution law of the shear lag is not changed much; no matter the construction stage and the completion stage, the phenomenon of negative shear lag appears. According to the theoretical analysis results of shear lag effect of n-shaped main girder in this paper, in order to provide the basis for the optimum design of n-shaped main girder of cable-stayed bridge, In this paper, the effects of cantilever length and thickness of the wing plate on the shear lag of the girder of a cable-stayed bridge are studied by means of the finite element method. The results show that the longitudinal distribution of the shear lag effect is not affected by the length of the cantilever plate with the increase of the length of the cantilever plate. Besides the end of the main beam and its adjacent beam segment, the shear lag coefficient of other beam segments is decreasing along the transverse direction, and the longitudinal and horizontal distribution of shear lag effect is obvious with the increase of the thickness of the flange.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.5

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本文編號：1557178