预应力混凝土曲线箱梁桥试验及扭转变形研究

发布时间：2018-02-25 23:38

本文关键词： 预应力混凝土曲线梁桥载荷试验剪力滞效应扭转变形预应力非对称设计截面参数　出处：《安徽工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土曲线梁桥结构以其特有的桥型和对地形的高度适应性等优点，在交通工程中得到广泛使用。但由于对曲线梁桥计算理论和受力特点研究尚有不足，使其在施工过程和运营中易产生相关病害。论文以某预应力混凝土曲线箱梁实桥为研究对象，通过对实桥施工全过程参与，，并借助有限元分析软件ANSYS平台，综合运用试验、数值方法探讨了预应力混凝土曲线梁桥受力特点和扭转变形效应。主要研究内容有： 1、基于有限元分析软件ANSYS平台，采用空间实体单元和其它空间单元相互组合的有限法，建立了适用于预应力混凝土曲线梁桥的数值建模理论。实桥箱梁预应力张拉模拟与试验对比结果表明，论文建议的数值模型能很好地表现曲线梁桥的空间受力特性，具有一定的可靠性。 2、综合应用现场载荷试验和有限元模拟数值分析的研究手段，在充分考虑曲线梁桥弯扭耦合效应影响的前提下，研究了成桥后主梁截面应力、变形及其分布情况，探讨了曲线梁桥箱梁截面剪力滞及曲率半径对箱梁截面剪力滞分布的影响规律。结果表明，实桥试验数据均小于模拟计算值，且主梁应力均在设计容许值范围内。 3、通过对曲线箱梁桥内外侧腹板预应力钢束张拉控制应力和位置非对称设计情况的模拟分析，分析预应力混凝土曲线箱梁桥在腹板预应力钢束非对称设计时梁体的扭转变形效应。结果表明：随着外侧腹板预应力钢束张拉控制应力的增大或内侧腹板预应力钢束位置高度的减小，梁体的扭转变形效应明显减小。 4、运用数值方法探讨了诸截面参数对曲线箱梁桥扭转变形的影响规律，结果表明：随着箱梁截面高度、底板宽度以及顶板厚度的增大，主梁的扭转变形效应减小，其中截面高度和底板宽度对其扭转变形影响较大。且随着曲率半径的增大，主梁扭转变形效应逐渐减小。
[Abstract]:Prestressed concrete curved girder bridge structure is widely used in traffic engineering because of its unique bridge type and high adaptability to terrain. This paper takes a prestressed concrete curved box girder bridge as the research object, participates in the whole construction process of the bridge, and makes use of the finite element analysis software ANSYS platform. The stress characteristics and torsional deformation effect of prestressed concrete curved girder bridge are discussed by numerical method. The main contents are as follows:. 1. Based on the finite element analysis software ANSYS platform, the finite method of combining spatial entity element with other spatial element is adopted. The numerical modeling theory of prestressed concrete curved girder bridge is established. The results of simulation and test show that the numerical model proposed in this paper can well represent the spatial stress characteristics of curved girder bridge. It has certain reliability. 2. The stress, deformation and distribution of the main beam section after the completion of the bridge are studied on the premise of fully considering the influence of the coupling effect of bending and torsion on the curved girder bridge by the means of field load test and finite element simulation numerical analysis. The influence of shear lag and radius of curvature of box girder section on shear lag distribution of box girder section of curved girder bridge is discussed. The results show that the experimental data of real bridge are all less than those calculated by simulation, and the stress of main beam is within the range of design allowable value. 3, through the simulation analysis of the control stress and position asymmetry design of the prestressed steel strands of the inner and outer side web of the curved box girder bridge, The torsional deformation effect of prestressed concrete curved box girder bridge in asymmetric design of web prestressed steel girders is analyzed. The results show that with the increase of the tension control stress of the external web prestressed steel bundle or the prestress of the inner web plate, the torsional deformation effect of the prestressed concrete curved box girder bridge is analyzed. The reduction of the height of the steel bundle, The torsional deformation effect of beam is obviously reduced. 4. The influence of section parameters on torsional deformation of curved box girder bridge is discussed by numerical method. The results show that the torsional deformation effect of main girder decreases with the increase of box girder cross section height, floor width and roof thickness. The section height and the width of the bottom plate have great influence on the torsional deformation, and with the increase of the radius of curvature, the torsional deformation effect of the main beam decreases gradually.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U446

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