独柱墩曲线梁桥抗倾覆性能的研究

发布时间：2018-03-18 19:23

本文选题：独柱墩　切入点：曲线桥　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：长时间来，曲线桥的设计一直大都是参考已建桥梁，梁理论上不像直桥那么规范，甚至对于小半径曲线桥来说，常常按照直桥来设计，这是不合理的。对于中间为单铰支座的独柱墩曲线桥的研究更是少之又少，特别在“弯扭”耦合作用下，此类桥梁容易倾覆，近几年这种桥梁形式出现了几次重大问题事故，在设计时如何能够保证运营桥梁正常使用成为了急需解决的问题。本文针对于独柱墩单点支承曲线桥容易倾覆的特点进行了详细的研究，分析了各种因素下，此类桥梁的受力变化特征，并找出其对于倾覆性能的影响。本文首先探究了曲线桥的受力特征、国内外的研究现状，以及国内外此类桥梁在运营时呈现的问题，并论证了对此课题研究的必要性。阐述了曲线桥的各种理论计算方法，提出了各种可能会影响其抗倾覆性能的因素。随后本文通过工程实例，运用MIDAS CIVEL有限元软件进行计算分析，找出了曲线桥支座的脱空规律，，并针对支座预偏心、支座间距、移动荷载、支座布置形式以及温度效应等因素进行了详细的探讨，分析了这几种因素对曲线桥的抗倾覆的影响，说明了此种考虑对为曲线桥防止出现“爬移”现象、出现支座脱空现象的重要性。文章最后得到以下结论：独柱墩曲线桥容易发生支座脱空现象，随着移动荷载的逐步增加，内侧支座反力迅速降低直至出现负反力造成支座脱空现象；在预偏心的设计时要注重多种因素结合考虑，不可只从单一方面着手；支座间距以及布置方式要结合实际工程，多方选择以确定最好布置方式与间距；温度效应对曲线桥的抗倾覆稳定性的影响也不可忽视。
[Abstract]:For a long time, the design of curved bridges has been mostly referred to the bridges built, and the beam is not as standard as the straight bridges in theory. Even for curved bridges with small radius, they are often designed according to the straight bridges. This is unreasonable. There is little research on single column pier curved bridge with single hinge support in the middle. Especially under the action of "bending and torsion" coupling, this kind of bridge is prone to overturn. In recent years, there have been several major problem accidents in this kind of bridge form. How to ensure the normal operation of the bridge has become an urgent problem in the design. In this paper, according to the characteristics of the single point supported curved bridge with single column pier, the easy capsizing of the bridge is studied in detail, and the various factors are analyzed. The force change characteristics of this kind of bridge and its influence on capsizing performance are found out. In this paper, the stress characteristics of curved bridges, the current research situation at home and abroad, and the problems in operation of this kind of bridges at home and abroad are discussed, and the necessity of the research on this subject is demonstrated, and the various theoretical calculation methods of curved bridges are expounded. Various factors which may affect its capsizing performance are put forward. Then, by using MIDAS CIVEL finite element software to calculate and analyze through the engineering example, find out the law of void removal of the support of the curved bridge, and aim at the bearing pre-eccentricity, support spacing, moving load, The bearing arrangement and temperature effect are discussed in detail, and the influence of these factors on the resistance to overturning of curved bridge is analyzed. It is shown that this kind of consideration can prevent the phenomenon of "climbing and shifting" for the curved bridge. The importance of the phenomenon of pedestal detachment. Finally, the following conclusions are obtained: the phenomenon of support void is easy to occur in the curved bridge with single column pier, and with the gradual increase of moving load, the reaction force of the inner support decreases rapidly until the negative reaction force results in the void phenomenon of the bearing; In the design of preeccentricity, many factors should be considered, not only from a single aspect, but also from a single aspect. The effect of temperature on the overturning stability of curved bridge can not be ignored.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.42

【参考文献】