發(fā)布時間：2018-06-30 01:43

  本文選題：橋梁工程 + 波紋鋼腹板組合截面　； 參考：《長安大學》2014年碩士論文

【摘要】：21世紀以來，隨著我國組合梁橋的迅速發(fā)展，波紋鋼腹板組合箱梁橋的應用越來越廣泛。本文在總結前人研究成果基礎上，，通過理論推導和有限元分析，系統(tǒng)地研究了大跨徑變截面單箱三室波紋鋼腹板組合連續(xù)箱梁橋剪力滯后效應，本文主要完成的工作： 首先介紹了波紋鋼腹板組合梁橋在橋梁工程結構中的發(fā)展歷史和應用現狀；然后基于剪切變形規(guī)律確定各箱室翼緣板剪力流的比值，定義了單箱三室波紋鋼腹板組合截面上、下翼緣板的剪力滯翹曲位移函數，應用能量變分法的最小勢能原理分別推導了在集中荷載和均布荷載作用下單箱三室波紋鋼腹板組合連續(xù)梁橋上、下翼緣板的縱向正應力及其剪力滯系數的計算公式。 針對大跨徑變截面波紋鋼腹板組合連續(xù)箱梁橋奉化江大橋，采用有限元方法研究了在集中荷載、均布荷載、實橋工況（體外預應力荷載、自重+體外預應力荷載、移動荷載）作用下全橋關鍵截面（即中跨跨中、中跨l/4、中支座、邊跨l/4及邊跨跨中位置）上、下翼緣板的縱向正應力及其剪力滯系數的分布；并針對剪力滯后效應較為嚴重的中跨跨中位置上、下翼緣板的關鍵計算點，采用第二章推導的縱向正應力的理論計算公式進行了復核；對全橋梁段截面在集中荷載和均布荷載作用下上、下翼緣板的最大剪力滯系數沿主梁縱向位置的分布規(guī)律進行了分析。 采用有限元方法對影響單箱三室波紋鋼腹板組合箱梁橋關鍵截面的上、下翼緣板剪力滯后效應的結構構造參數如寬跨比、寬高比、懸翼比（內室懸翼比及外室懸翼比進行了參數分析，并提出了以敏感參數為變量的剪力滯系數的經驗公式。 本文最后依據翼緣板的有效分布寬度比與最大剪力滯系數的倒數關系，提出了適用于單箱三室波紋鋼腹板組合箱梁橋上、下翼緣板計算有效分布寬度的經驗公式，并與同跨等荷載等截面混凝土腹板連續(xù)梁橋翼緣板的有效分布寬度進行了對比分析。
[Abstract]:Since the 21st century, with the rapid development of composite girder bridges in China, corrugated steel webs composite box girder bridges are more and more widely used. Based on the previous research results, the shear lag effect of long span variable cross section single box, three compartment corrugated steel web composite continuous box girder bridge is systematically studied by theoretical derivation and finite element analysis in this paper. The main work of this paper is as follows: firstly, the development history and application status of corrugated steel web composite beam bridge in bridge structure are introduced, and then the shear flow ratio of flange plate in each box is determined based on shear deformation law. The shear lag warpage displacement function of the lower flange plate on the combined section of three compartments corrugated steel web in a single box is defined. By using the principle of minimum potential energy of the energy variational method, the formulas for calculating the longitudinal normal stress and shear lag coefficient of the lower flange plate on the three-compartment corrugated steel web composite continuous beam bridge with order box issued by concentrated load and uniform load are derived, respectively. In view of Fenghua River Bridge with corrugated steel webs combined with long span variable cross section, the finite element method is used to study the concentrated load, uniform load, real bridge condition (external prestressing load, self-weight external prestress load). The distribution of longitudinal normal stress and shear lag coefficient of the bottom flange plate on the key section of the whole bridge under the action of moving load (that is, the middle span, the middle span l / 4, the middle support, the side span l / 4 and the side span middle position); According to the key calculation point of the lower flange plate where the shear lag effect is more serious in the middle span and the middle span, the theoretical formula of the longitudinal normal stress derived in the second chapter is used to recheck. The distribution of the maximum shear lag coefficient of the lower flange plate along the longitudinal position of the main beam is analyzed under the action of concentrated load and uniform load on the section of the whole bridge section. The structural parameters, such as width to span ratio and width to height ratio, which influence the shear lag effect of flange plate on the key sections of a single box, three compartment corrugated steel web girder bridge, are studied by finite element method. The parameter analysis of the hanging wing ratio (the ratio of the inner wing and the outer wing) is carried out, and the empirical formula of the shear lag coefficient with the sensitive parameter as the variable is proposed. Finally, according to the reciprocal relation between the effective distribution width ratio of flange plate and the maximum shear lag coefficient, an empirical formula for calculating the effective distribution width of the lower flange plate on a single box and three compartment corrugated steel web composite box girder bridge is presented. And the effective distribution width of the flange plate of the concrete web continuous beam bridge with the same span and equal load is compared and analyzed.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U448.213

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