曲线宽箱梁桥的力学性能研究

发布时间：2018-04-10 03:21

本文选题：曲线连续宽箱粱　切入点：受力不均匀性　出处：《中南林业科技大学》2015年硕士论文

【摘要】：曲线梁桥是现代化交通工程中的一种重要桥型。近年来,随着高等级公路和城市道路的迅速发展,同时考虑到地形、地物的限制,路线整体线形的连续性以及城市景观美化等因素,使得曲线桥被普遍采用。但是曲线桥的弯扭耦合效应,使得其结构分析成为一个复杂的空间问题。目前,用于曲线宽箱梁桥分析的传统梁格法计算精度有限,而三维实体元法使用又不方便。因此,既要保证计算精度、又要方便实用的曲线宽箱梁桥结构设计计算模型与算法仍有待于进一步研究与完善。另外,随着曲线宽箱梁桥的大规模使用,各种病害也大量出现,进一步研究曲线宽箱梁桥工程事故、病害发生的力学机理及影响因素是十分必要的。本文基于梁格法、有限单元法以及比拟正交异性板法的基本原理,针对曲线宽箱梁的截面特点,探讨和提出了一种相对简单实用又具有足够精度的改进梁格法,即比拟板—梁格法,并提出了比拟板—梁格法在梁格划分以及截面特性计算的一般方法。模拟实际工程,利用有限元软件MIDAS/CIVIL和ANSYS建立曲线宽箱梁桥的传统梁格模型、比拟板—梁格模型以及精细的实体元模型,研究曲线宽箱梁在不同荷载作用下的空间受力情况及内力横向传递机理。制作三跨连续曲线宽箱梁桥的有机玻璃模型,采用静力加载的方式测得曲梁控制截面上的应变值和挠度值,并提出了用“不均匀系数”来表达曲线桥受力的不均匀性。将试验结果与有限元模型的计算结果进行比较分析,验算比拟板—梁格法所提模型的计算精度及实用性,同时得到了曲线连续宽箱梁的应力与挠度横向分布规律。以在建的湖南省大岳高速君山互通主线桥所接的A匝道第一联曲线宽箱梁桥为背景,采用比拟板—梁格有限元模型对混凝土曲线连续宽箱梁进行平面内的变形分析。同时针对此桥的力学特点,对其因梁体变形而可能引起的病害进行分析,为设计、施工提供参考。’
[Abstract]:Curved girder bridge is an important bridge type in modern traffic engineering.In recent years, with the rapid development of high-grade highways and urban roads, taking into account the terrain, the constraints of features, the continuity of the overall alignment of routes, and urban landscape beautification, curved bridges are widely used.However, the structure analysis of curved bridge becomes a complicated spatial problem because of the coupling effect of bending and torsion.At present, the traditional girder method used to analyze curved wide box girder bridges has limited accuracy, but the 3D solid element method is not convenient to use.Therefore, the calculation model and algorithm for structural design of curved wide box girder bridges should be further studied and improved.In addition, with the large-scale use of curved wide box girder bridges, a large number of diseases also appear. It is necessary to further study the engineering accidents of curved wide box girder bridges.Based on the basic principles of beam lattice method, finite element method and orthotropic plate method, this paper discusses and proposes an improved beam method, which is relatively simple and practical and has enough precision, according to the cross-section characteristics of curved wide box girder.That is to say, the plate-beam method is compared, and the general method of comparing plate-beam method in the division of beam lattice and the calculation of cross-section characteristic is put forward.In order to simulate the practical engineering, the traditional girder model of curved wide box girder bridge is established by using the finite element software MIDAS/CIVIL and ANSYS, and the plate-girder model and the fine solid element model are compared.The space force and the lateral transfer mechanism of the curved wide box girder under different loads are studied.The organic glass model of three-span continuous curved wide box girder bridge is made. The strain value and deflection value on the control section of curved beam are measured by static loading method, and the "non-uniform coefficient" is proposed to express the inhomogeneity of the curved bridge.The experimental results are compared with the results of the finite element model. The accuracy and practicability of the model proposed by the plate-beam method are compared and the transverse distribution of stress and deflection of curved continuous wide box girder is obtained.Based on the first curved wide box girder bridge of A ramp connected to the main line bridge of Dayue high-speed Junshan intercommunication in Hunan Province, the in-plane deformation analysis of concrete curved continuous wide box girder is carried out by using the finite element model of analogy slab-girder lattice.At the same time, according to the mechanical characteristics of the bridge, the possible damage caused by the deformation of the beam body is analyzed, which provides a reference for the design and construction of the bridge.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.213

【参考文献】