矮塔斜拉桥箱梁空间效应分析

发布时间：2018-07-18 13:56

【摘要】：矮塔斜拉桥兼有塔矮、梁刚、索集中及外形美观等特点,近年来在国内外得到迅速的发展和广泛的应用。从结构特点来看,矮塔斜拉桥是在斜拉桥和连续梁桥之间的一种过渡桥型,斜拉索只分担部分荷载,还有大部分的荷载由主梁的抗弯、抗剪来承受。市政建设中的矮塔斜拉桥的宽度一般多达三十米以上,宽幅梁体受力复杂,空间应力不均匀现象十分严重。如主梁的0号块,不但其自身构造复杂,而且其作用荷载也是多变的,在设计时难以把握。同时现行规范主要是针对柔细梁的混凝土结构,对于现在越来越多的宽幅箱梁结构,现行规范显然有它的局限性,以至于发生混凝土开裂现象,却无法从现行规范的设计验算方法中找到相应的验算应力。针对以上情况,本文以某跨颖河矮塔斜拉桥为工程背景,运用Midas/Civil 2012建立全桥空间杆系有限元模型,详细分析颖河大桥的整体受力特性,然后利用Midas/Fea 3.6建立0号块空间有限元模型,分析了最大悬臂阶段和成桥阶段的应力分布特点,再进一步建立6号块～8号块的空间实体模型,利用完整验算应力理论对7号块的抗裂性进行精细化分析。本文的研究可以为此类桥梁的设计、施工提供一定的借鉴。
[Abstract]:The cable-stayed bridge with short tower, rigid beam, concentrated cable and beautiful appearance has been developed rapidly and widely used in recent years. From the point of view of the structural characteristics, the low tower cable-stayed bridge is a kind of transition bridge between the cable-stayed bridge and the continuous beam bridge. The cable-stayed cable only shares part of the load, and most of the load is borne by the bending and shear resistance of the main beam. The width of the low tower cable-stayed bridge in municipal construction is generally more than 30 meters, the force of the wide beam body is complex, and the spatial stress uneven phenomenon is very serious. For example, block 0 of main beam is not only complicated in structure, but also variable in load, so it is difficult to grasp in design. At the same time, the current code is mainly aimed at the concrete structure of flexible beam. For more and more wide box girder structures, the current code obviously has its limitations, so that concrete cracking occurs. However, the corresponding checking stress can not be found from the design checking method of the current code. In view of the above situation, this paper takes a short tower cable-stayed bridge across Ying River as the engineering background, establishes the finite element model of the spatial bar system of the whole bridge by using Midas / Civil 2012, and analyzes in detail the overall mechanical characteristics of the bridge. Then the spatial finite element model of block 0 is established by using Midas / Fea 3.6, and the stress distribution characteristics of maximum cantilever stage and bridge stage are analyzed, and the spatial solid model of block 6 ~ 8 is further established. The crack resistance of block 7 is analyzed in detail by using the complete checking stress theory. The research in this paper can provide some reference for the design and construction of this kind of bridge.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27

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