本文選題：曲線斜腹板箱梁橋　切入點(diǎn)：彎扭耦合　出處：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：曲線箱梁橋以設(shè)計(jì)上布置靈活，受地形地物限制較小的特點(diǎn)，成為立體交叉工程中實(shí)現(xiàn)聯(lián)結(jié)各方向交通的重要手段，在橋梁建設(shè)中廣泛采用。本文以實(shí)際工程為依托，采用MIDAS CIVIL2012有限元軟件，針對(duì)曲線箱梁橋特有的彎扭耦合效應(yīng)，分析了不同設(shè)計(jì)參數(shù)對(duì)曲線斜腹板箱梁橋受力和變形的影響。主要開(kāi)展了以下研究： 1.基于曲線箱梁橋的基本分析理論，明確了適合曲線斜腹板箱梁的分析理論和方法，推薦了考慮曲線箱梁橋空間受力性能的梁格理論，為本文研究奠定了理論基礎(chǔ)。 2.以實(shí)際工程為研究對(duì)象，分別建立空間單梁模型、梁格模型與板單元模型，并進(jìn)行不同荷載工況下支點(diǎn)反力、撓度的對(duì)比分析。證實(shí)梁格法在分析曲線斜腹板箱梁橋的可靠性和實(shí)用性。 3.基于梁格理論，，詳細(xì)分析了影響曲線斜腹板箱梁受力和變形的三個(gè)重要設(shè)計(jì)參數(shù)：曲率半徑、高跨比和寬跨比。結(jié)果表明：(1)曲率半徑越小，箱梁內(nèi)外側(cè)的撓度差異越大，即彎曲程度越大，曲線斜腹板箱梁橋的彎扭耦合效應(yīng)越明顯。(2)隨著梁高跨比的增大，箱梁內(nèi)外側(cè)變形差異減小，即梁高跨比越大，主梁的抗彎和抗扭能力越強(qiáng)，曲線斜腹板箱梁橋的彎扭耦合效應(yīng)越弱。(3)隨著梁寬跨比的增大，荷載作用下的內(nèi)外側(cè)變形差異越大，即梁寬跨比越大，同一荷載作用下，曲線斜腹板箱梁彎扭耦合效應(yīng)越明顯。
[Abstract]:Curved box girder bridge is widely used in bridge construction because of its flexible layout in design and limited by terrain and features. This paper analyzes the influence of different design parameters on the force and deformation of curved inclined web box girder bridge by using MIDAS CIVIL2012 finite element software, aiming at the bending and torsional coupling effect of curved box girder bridge. 1. Based on the basic analysis theory of curved box girder bridge, the analysis theory and method suitable for curved inclined web box girder are defined, and the beam lattice theory considering the spatial mechanical behavior of curved box girder bridge is recommended, which lays a theoretical foundation for the research of this paper. 2. Taking the actual engineering as the research object, the space single beam model, the beam lattice model and the plate element model are established, and the fulcrum reaction force under different load conditions is carried out. The reliability and practicability of the girder method in the analysis of curved inclined web box girder bridges are confirmed. 3. Based on the theory of beam lattice, three important design parameters affecting the force and deformation of curved inclined web box girder are analyzed in detail: radius of curvature, ratio of height to span and ratio of width to span. The results show that the smaller the radius of curvature is, the greater the difference of deflection between inside and outside of box girder is. That is, the greater the bending degree, the more obvious the coupling effect of bending and torsion of the curved inclined web box girder bridge. (2) with the increase of the ratio of beam height to span, the difference of deformation inside and outside the box girder decreases, that is, the greater the ratio of beam height to span, the stronger the flexural and torsional ability of the main girder. The bending and torsional coupling effect of curved inclined web box girder bridge is weaker. 3) with the increase of the ratio of beam width to span, the difference of lateral and outer side deformation under load is greater, that is, the greater the ratio of beam width to span, the more obvious the effect of bending and torsional coupling of curved inclined web box girder under the same load.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.213

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