高墩曲线连续刚构桥施工阶段稳定性分析

发布时间：2018-04-27 16:47

本文选题：高墩曲线 + 连续刚构桥　；参考：《郑州大学》2017年硕士论文

【摘要】：我国的交通运输事业伴随着经济的发展也得到了快速的发展,曲线桥在实际工程中得到了广泛的应用。在西部山区,由于地形的限制,高墩曲线连续刚构桥的优点使得其得以大显身手。由于其集高墩、曲线、连续刚构的特点于一体,受力复杂,高墩曲线连续刚构桥施工过程的稳定性分析就显得尤为重要。以某实际工程为背景,建立三个主要阶段的有限元模型,分别对其进行线性稳定分析和考虑几何非线性效应的非线性稳定分析,力求得到结构稳定性的变化规律以供设计和施工人员参考,主要研究内容如下:(1)介绍了高墩曲线连续刚构桥发展历程、结构特点,阐述了连续刚构桥国内外发展现状;详细介绍了桥梁结构的两类稳定问题和判别标准,几何非线性分析的基本理论和方法。(2)基于工程实例和有限元程序,使用梁单元建立该桥三个阶段的有限元模型。分析了0号块阶段,最大悬臂状态和成桥状态的稳定性,得到了结构在三个阶段不同工况下的稳定安全系数和屈曲模态。在此基础上对各个阶段分别建立多个模型分析了桥墩设计参数对于结构稳定性的影响,总结出了桥墩长细比和稳定安全系数之间的可函数化的规律。分析了最大悬臂阶段和成桥阶段,曲率半径对结构稳定性的影响。(3)针对桥梁结构最大悬臂阶段受力复杂,稳定性也最弱的情况,对其进行了理想状态下、初始材料缺陷下、初始几何缺陷下和不同桥墩形式下的几何非线性稳定分析,对比了线性稳定和非线性稳定分析结果的差异。
[Abstract]:Along with the development of economy, the traffic and transportation in our country has also been developed rapidly. The curved bridge has been widely used in practical engineering. In the western mountainous area, the advantages of the continuous rigid frame bridge of high pier curve can be made great by the advantages of the terrain, which has the characteristics of high piers, curves and continuous rigid frames. The stability analysis of the construction process of high pier curved continuous rigid frame bridge is very important. Taking a practical project as the background, the finite element model of three main stages is set up. The linear stability analysis and nonlinear stability analysis of geometric nonlinear effects are carried out respectively to obtain the change law of structural stability so as to provide the design for the design. The main research contents are as follows: (1) the development process and structural characteristics of the high pier curved continuous rigid frame bridge are introduced, and the development status of the continuous rigid frame bridge at home and abroad is expounded. The two kinds of stability problems and criteria for the bridge structure, the basic theory and method of geometric nonlinear analysis are introduced in detail. (2) based on the engineering example and the finite element, The finite element model of the three stages of the bridge is established by using the beam element. The stability of the maximum cantilever state and the bridge state of the 0 block stage is analyzed. The stability safety factor and the buckling mode of the structure under different working conditions in three stages are obtained. On this basis, several models are established to analyze the bridge pier design parameter respectively. For the influence of the structural stability, the regularities between the length and fineness ratio of the pier and the stability safety factor are summed up. The influence of the maximum cantilever stage and the bridge stage, the curvature radius on the structural stability is analyzed. (3) it is ideal for the case that the maximum cantilever stage of the bridge structure is complex and the stability is weakest. Under the condition of the initial material defect, the geometric nonlinear stability analysis under the initial geometric imperfections and the different pier forms, the difference between the linear stability and the nonlinear stability analysis results is compared.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.23

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