公路斜交箱梁及其角隅受力特性与构造设计研究

发布时间：2018-03-13 11:25

本文选题：斜交箱梁　切入点：角隅　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：斜交箱梁桥是城市桥梁中常见结构,斜交角度越大,其构造和受力越复杂,本文以钢筋混凝土多室简支箱梁为对象,以数值分析法为手段,研究斜交箱梁的总体受力特征及角隅区的局部受力特征与构造措施,主要工作和成果有： 1.基于ANSYS有限元软件平台,建立斜交箱梁桥的实体单元模型、板单元模型等多种有限元模型,探讨了各种模型的适用性。 2.以45°斜交箱梁和正交箱梁为研究对象,对比分析斜交箱梁整体力学特征,包括支座反力、纵向弯矩、横向弯矩、扭矩、主弯矩、主轴力、主拉应力等,进而分析斜交角在0-75°范围内变化时,各力学特性的变化特征。 3.针对斜交箱梁顶板和底板的结构特征,开展了不同约束方式的斜交板的受力特点,并与常规斜交板桥的受力特征进行了对比,揭示了斜交箱梁顶板和底板的受力特点。 4.以宽跨比、支座刚度、横隔板刚度和腹板厚度为设计参数,研究其变化对斜交箱梁整体、顶板和底板的影响,总结其变化规律。 5.基于实体单元模型分析斜交箱梁角隅的局部受力特点,并就斜交角、梗胁尺寸等参数影响进行了分析,通过与正交箱梁进行对比,总结斜交箱梁角隅区力学特征变化规律,提出缓解局部应力的构造措施。 6.提出斜交箱梁顶板、底板受力钢筋的配筋设计,以及角隅区局部应力加强钢筋的配筋设计,为设计提供一定的参考。图133幅,表30个,参考文献72篇
[Abstract]:Absrtact: skew box girder bridge is a common structure in urban bridges. The larger the angle of skew intersection is, the more complex its structure and force are. In this paper, the reinforced concrete multi-chamber simply supported box girder is taken as the object and the numerical analysis method is used. In this paper, the general stress characteristics of skew box girder and the local stress characteristics and construction measures in corner area are studied. The main work and results are as follows:. 1. Based on the ANSYS finite element software platform, the solid element model, plate element model and other finite element models of skew box girder bridge are established, and the applicability of these models is discussed. 2. Taking 45 掳skew box girder and orthogonal box girder as the research object, the overall mechanical characteristics of skew box girder are compared and analyzed, including support reaction force, longitudinal moment, transverse moment, torque, main bending moment, spindle force, main tensile stress, etc. Furthermore, the characteristics of the mechanical properties of the oblique angle are analyzed when the angle varies in the range of 0-75 掳. 3. According to the structural characteristics of the top and bottom plate of the skew box girder, the stress characteristics of the oblique plate with different restraint modes are carried out, and compared with the stress characteristics of the conventional skew plate bridge, the stress characteristics of the top plate and the bottom plate of the skew box girder are revealed. 4. Taking the aspect ratio, support stiffness, transverse diaphragm stiffness and web thickness as the design parameters, the influence of the change on the whole, roof and bottom plate of the skew box girder is studied, and its changing law is summarized. 5. Based on the solid element model, the local stress characteristics of the corner of skew box girder are analyzed, and the influence of the parameters such as the angle of skew and the dimension of the pedicle are analyzed. By comparing with the orthogonal box girder, the variation law of mechanical characteristics in the corner region of the skew box girder is summarized. The structural measures for relieving local stress are put forward. 6. The reinforcement design of bevel box girder roof and floor steel bar, and the reinforcement design of local stress reinforced steel bar in corner area are put forward, which provide some references for the design. 133 figs, 30 tables and 72 references are given.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.41

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