大跨度上承式钢筋混凝土拱桥极限承载力分析

发布时间：2018-04-02 02:17

本文选题：钢筋混凝土拱桥　切入点：施工阶段　出处：《长安大学》2014年硕士论文

【摘要】：随着交通建设的蓬勃发展和近些年西部大开发的战略实施，大跨度的钢筋混凝土拱桥在中国西部地区得到了飞速的发展，对其施工阶段的力学行为研究和成桥状态下的极限承载力分析具有重要的理论意义和实用价值。本文总结和归纳了目前国内外学者对拱桥极限承载力的研究现状，，介绍了拱桥的稳定理论、非线性分析有限元理论及非线性问题的求解方法。结合背景工程马蹄河特大桥，应用有限元软件Midas/Civil基于影响矩阵的未知荷载系数法对悬臂浇筑施工阶段的扣、锚索索力进行了优化，主拱圈合拢之后，对其扣、锚索的拆除顺序进行了探讨，对该桥施工过程的稳定性进行了分析。采用ANSYS程序建立有限元计算模型，对该桥成桥状态下的第一类弹性稳定进行了分析，同时研究不同加载方式、矢跨比、拱圈面内抗弯刚度对该桥第一类稳定性的影响。分别就该桥在恒载作用下的弹性屈曲问题、第二类弹性稳定问题（几何非线性问题）以及极限承载力问题进行了分析，并对达到极限荷载时的破坏过程和破坏形式进行了分析。影响大跨度钢筋混凝土拱桥极限承载力的因素很多，主要分为荷载形式、结构设计参数和初始几何缺陷三大类，通过对马蹄河特大桥的上述参数分析来寻求影响其极限承载力的关键因素，为其设计和施工提供有力的支撑。
[Abstract]:With the vigorous development of traffic construction and the implementation of the strategy of western development in recent years, the long-span reinforced concrete arch bridge has developed rapidly in western China. It is of great theoretical significance and practical value to study the mechanical behavior in the construction stage and to analyze the ultimate bearing capacity under the condition of the completed bridge. This paper summarizes and summarizes the current research situation of the ultimate bearing capacity of arch bridge at home and abroad. The stability theory of arch bridge, the finite element theory of nonlinear analysis and the solving method of nonlinear problem are introduced. Using the finite element software Midas/Civil based on the unknown load coefficient method of influence matrix, the buckle and cable force in cantilever construction stage are optimized. After the main arch ring is closed, the order of buckle and the removal of anchor cable are discussed. The stability of the bridge during construction is analyzed. The finite element calculation model is established by using ANSYS program, and the first kind of elastic stability of the bridge under the condition of bridge completion is analyzed. At the same time, the different loading modes, the rise-span ratio, are studied. The influence of in-plane bending stiffness of arch ring on the stability of the first type of the bridge is analyzed. The elastic buckling problem of the bridge under dead load, the second kind of elastic stability problem (geometric nonlinear problem) and the ultimate bearing capacity are analyzed respectively. The failure process and failure form of long-span reinforced concrete arch bridge are analyzed. There are many factors affecting ultimate bearing capacity of long-span reinforced concrete arch bridge, which are mainly divided into three categories: load form, structural design parameters and initial geometric defects. By analyzing the above parameters of Mati River Bridge, the key factors affecting the ultimate bearing capacity of the bridge are found, which can provide strong support for the design and construction of the bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22;U441

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