大跨径混合梁斜拉桥钢混结合段受力性能分析

发布时间：2018-04-22 19:34

本文选题：混合梁斜拉桥 + 钢混结合段　；参考：《重庆交通大学》2015年硕士论文

【摘要】：本文依托重庆已完工项目—永川长江大桥为背景工程,采用Midas/FEA与Midas/Civil对混合梁斜拉桥钢混结合段受力性能进行分析。对于大跨径混合梁斜拉桥,主跨钢梁与边跨预应力混凝土梁之间的结合段是混合梁桥的重要组成部分。结合段位置的合理性与构造的可靠性,是影响混合梁桥设计施工的关键问题。在考虑钢混结合段的受力性能时,在功能上应能够使各种内力(轴力、弯矩、剪力、扭矩)在钢梁与混凝土梁之间可靠、顺畅传递。在构造上应使两部分梁体外形协调一致,尽可能避免刚度和强度突变,保证结合段具有良好的抗疲劳性和耐久性。当前国内外许多学者针对钢混结合段受力特性问题做了大量的研究工作,得出了许多已经成熟的理论。本文在前人研究的基础上,主要对以下内容进行了研究:①重庆永川长江大桥的斜拉索为空间索布置,并非传统的平面索布置,大桥及钢混结合段的空间效应较为明显。针对这一特点,对钢混结合段的受力性能进行空间有限元分析;②采用Midas/Civil建立全桥模型分析大桥在悬臂拼装施工过程中钢混结合段的内力变化;以及合拢前后,体系转换过程前后钢混结合段的受力性能变化情况,从全桥整体受力角度对钢混结合段受力进行分析;③通过大型有限元软件Midas/FEA对钢混结合段建立空间有限元计算模型,对钢混结合段的材料特性,边界约束等进行仿真模拟,以求理论计算结果与实际情况相吻合;④根据全桥有限元模型所提取的施工阶段及成桥运营阶段中荷载工况,选取代表性工况将其施加于实体仿真模型中进行细部对比分析,探讨钢混结合段受力性能。
[Abstract]:Based on the Chongqing completed project, Yongchuan Yangtze River Bridge, this paper uses Midas/FEA and Midas/Civil to analyze the mechanical behavior of the steel-concrete joint section of the hybrid girder cable-stayed bridge. For long span hybrid girder cable-stayed bridge, the joint section between main span steel beam and side span prestressed concrete beam is an important part of hybrid beam bridge. The rationality of the position of the combined section and the reliability of the structure are the key problems affecting the design and construction of the hybrid beam bridge. When considering the mechanical behavior of the steel concrete joint section, the internal forces (axial force, bending moment, shear force, torque) should be able to transfer reliably and smoothly between the steel beam and concrete beam. In construction, the shape of the two parts of the beam should be consistent, the sudden change of stiffness and strength should be avoided as far as possible, and the fatigue resistance and durability of the joint should be guaranteed. At present, many scholars at home and abroad have done a lot of research work on the mechanical characteristics of steel concrete joint section, and got a lot of mature theory. On the basis of previous studies, this paper mainly studies the following contents: 1. The cable-stayed cable arrangement of the Chongqing Yongchuan Yangtze River Bridge is a space cable arrangement, not the traditional plane cable arrangement. The spatial effect of the bridge and the steel-concrete joint section is obvious. In view of this characteristic, the spatial finite element analysis on the mechanical behavior of steel concrete joint section is carried out. The Midas/Civil model is adopted to analyze the internal force change of the steel concrete joint section during the cantilever assembly construction, and before and after closure. In this paper, the mechanical behavior of the steel-concrete joint before and after the system conversion process is analyzed. The stress of the steel-concrete joint section is analyzed from the point of view of the whole bridge. The spatial finite element calculation model of the steel-concrete joint section is established by using the large-scale finite element software Midas/FEA. The material characteristics and boundary constraints of the steel-concrete joint section are simulated in order to obtain the theoretical calculation results in accordance with the actual situation. 4. According to the whole bridge finite element model, the load conditions in the construction stage and the operation stage of the bridge are obtained. Select the representative working condition to apply it to the entity simulation model to carry on the detailed contrast analysis, discuss the mechanical behavior of the steel-concrete joint section.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

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