曲线斜腹板箱梁基于梁格法若干问题研究

发布时间：2018-03-31 10:29

本文选题：曲线斜腹板箱梁桥　切入点：弯扭耦合　出处：《长安大学》2014年硕士论文

【摘要】：曲线箱梁桥以设计上布置灵活，受地形地物限制较小的特点，成为立体交叉工程中实现联结各方向交通的重要手段，在桥梁建设中广泛采用。本文以实际工程为依托，采用MIDAS CIVIL2012有限元软件，针对曲线箱梁桥特有的弯扭耦合效应，分析了不同设计参数对曲线斜腹板箱梁桥受力和变形的影响。主要开展了以下研究： 1.基于曲线箱梁桥的基本分析理论，明确了适合曲线斜腹板箱梁的分析理论和方法，推荐了考虑曲线箱梁桥空间受力性能的梁格理论，为本文研究奠定了理论基础。 2.以实际工程为研究对象，分别建立空间单梁模型、梁格模型与板单元模型，并进行不同荷载工况下支点反力、挠度的对比分析。证实梁格法在分析曲线斜腹板箱梁桥的可靠性和实用性。 3.基于梁格理论，，详细分析了影响曲线斜腹板箱梁受力和变形的三个重要设计参数：曲率半径、高跨比和宽跨比。结果表明：(1)曲率半径越小，箱梁内外侧的挠度差异越大，即弯曲程度越大，曲线斜腹板箱梁桥的弯扭耦合效应越明显。(2)随着梁高跨比的增大，箱梁内外侧变形差异减小，即梁高跨比越大，主梁的抗弯和抗扭能力越强，曲线斜腹板箱梁桥的弯扭耦合效应越弱。(3)随着梁宽跨比的增大，荷载作用下的内外侧变形差异越大，即梁宽跨比越大，同一荷载作用下，曲线斜腹板箱梁弯扭耦合效应越明显。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213

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