【作者】 唐康；

【导师】 李永乐；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 广雅大桥位于柳州市区,主桥采用海鸥式中承式刚架系杆拱桥,孔跨布置为63+210+210+63m,主桥总长546m。由于全桥各杆件间的连接均为刚性连接,特别是钢箱混凝土拱脚与混凝土拱座刚结点连接处杆件众多、受力复杂,整体分析中很难考虑拱脚刚结点的构造细节,因此有必要在全桥整体分析的基础上对拱脚刚结点进行局部应力研究,探索局部区域各构件的应力分布规律,对该区域的细部设计进行优化和改进。本文完成的主要工作如下：(1)介绍了梁拱组合体系桥的特点,归纳和总结了系杆拱桥刚结点的研究现状,明确了刚架系杆拱桥拱脚刚结点应力分布机制研究的重要性。(2)讨论了局部分析的重要性,研究了局部分析的基本方法,根据圣维南原理确定了局部模型的截取原则和建立方法,并且确定了边界条件的施加方法。(3)比较准确地建立了拱脚刚结点处局部分析有限元模型,对计算应力结果进行分析,探索局部区域各构件的传力机制,评价该区域细部设计的优缺点。(4)讨论了拱脚刚结点处细部设计的不合理性,通过多种构造措施优化和改进了拱脚刚结点处局部构造。计算结论表明：通过优化和改进后的拱脚刚结点局部应力分布机制更趋于合理。更多还原

【Abstract】 Guangya Bridge locates at Liuzhou city, the main bridge is a half-through and rigid-framed tied arch bridge with a shape looks like a seagull. Its span layout is 63+210+210+63m and total length is 546m. Numerous rigid joints are applied to connect all kinds of members. The rigid joint locates between steel-box arch foot filled by concrete and arch abutment casted by concrete has very complicated structural and mechanical properties and its construction details are very difficult to be simulated in the finite element analysis of the whole bridge. It is necessary to carry out the local stress research for the rigid joint on the basis of the analysis of the whole bridge, and then find out the stress distribution rule and improve its detail design. The main work have been done as follows:(1) The feature of the beam-arch combination bridge is introduced and the research status of the rigid joint of tied arch bridge is summarized, and then the importance of stress distribution mechanism of the rigid joint of the rigid-framed tied arch bridge is maked clear.(2) The importance of the local analysis is discussed and the basic method of the local analysis is researched, and then the local model is intercepted and established and the boundary condition are also applied on the basis of the Saint-Venant’s Principle.(3) The finite element model of local rigid joint of arch foot is accurately established to analysis stress results and explore the stress distribution mechanism of each member in local region, and then the advantage and the disadvantage of the local region are evaluated by the stress results.(4) The shortage of the detail design of the rigid joint of arch foot is pointed out by the calculation results, and then various construction measures are used to improve the local construction of the rigid point of arch foot. The results show that the stress distribution mechanism of rigid joint of arch foot improved by various measures is more reasonable than before.更多还原