韩江大桥道岔连续梁扭转畸变分析

发布时间：2018-04-26 03:25

本文选题：多室箱梁 + 扭转　；参考：《石家庄铁道大学》2014年硕士论文

【摘要】：由于多室箱梁具有抗弯能力强、抗扭刚度大等优良的结构及受力性能,因此广泛用于修建城市桥梁、曲线桥和大跨度桥,但它在偏心荷载作用下的扭转畸变行为较为复杂。随着多室箱梁在桥梁工程领域的应用日益广泛,其扭转畸变效应越来越受到设计人员的重视。首先,根据普朗都提出的薄膜比拟法分析了多室箱梁的自由扭转问题,推导了多室箱梁的自由扭转剪力流方程及翘曲位移函数。其次,基于乌曼斯基约束扭转理论,推导了多室箱梁的扭转翘曲位移和应力；根据力法方程,求得约束扭转的剪力流；采用一般方法求解了多室箱梁的约束扭转微分方程,进而推导该微分方程的初参数格式；以双室箱梁的一般截面为例,根据位移互等定理,得出扭转中心位置计算公式。再次,利用力与力矩平衡原则,将作用在任意位置上的偏心荷载分解出畸变荷载、弯曲荷载与扭转荷载。利用箱型梁的畸变微分方程和弹性地基梁挠度曲微分方程之间的比拟关系,推导出变截面箱型梁畸变分析的单元刚度矩阵。最后,本文以韩江特大桥为研究对象,采用ANSYS进行仿真分析,对模型施加两种畸变荷载,得到三个方向上的畸变位移变化规律,同时与弯曲荷载、扭转荷载作用下的模型进行内力比较,从而总结出横隔板数量对扭转畸变效应的影响。进一步改变横隔板的厚度,观察畸变位移与内力的变化,分析出横隔板厚度对畸变效应的影响。
[Abstract]:Multi-chamber box girders are widely used to build urban bridges, curved bridges and long-span bridges because of their excellent structures and mechanical properties, such as strong flexural capacity and large torsional stiffness. However, the torsional distortion behavior of multi-chamber box girders under eccentric loads is more complicated. With the increasing application of multi-chamber box girder in bridge engineering, the torsional distortion effect is paid more and more attention by designers. Firstly, the free torsion problem of multi-chamber box girder is analyzed according to Plandu's thin-film analogy method, and the free torsional shear flow equation and warpage displacement function of multi-chamber box girder are derived. Secondly, based on Wumansky's constrained torsion theory, the torsional warping displacement and stress of multi-chamber box girder are deduced, the shear flow of constrained torsion is obtained according to the force method equation, and the constrained torsional differential equation of multi-chamber box girder is solved by general method. Then the initial parameter scheme of the differential equation is deduced and the calculation formula of torsional center position is obtained by taking the general section of the double-chamber box girder as an example according to the displacement reciprocal theorem. Thirdly, using the principle of force and torque balance, the eccentric load acting on any position is decomposed into distorted load, bending load and torsional load. The element stiffness matrix of box beam distortion analysis is derived by using the analogy between the differential equation of box beam distortion and the deflection differential equation of elastic foundation beam. Finally, this paper takes Hanjiang super bridge as the research object, uses ANSYS to carry on the simulation analysis, exerts two kinds of distortion load to the model, obtains the distortion displacement change law in three directions, simultaneously with the bending load, The internal force of the model under torsional load is compared, and the effect of the number of transverse diaphragm on the torsional distortion is summarized. The influence of the thickness of the transverse diaphragm on the distortion effect was analyzed by observing the variation of the distortion displacement and internal force.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.213

【参考文献】