宽幅矮塔斜拉桥的部分关键技术研究

发布时间：2018-02-28 10:05

本文关键词： 矮塔斜拉桥宽幅箱梁索力 0号块剪力滞效应　出处：《合肥工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：矮塔斜拉桥作为一种新型的桥梁结构问世至今仅仅30余年，但其发展无论是在结构形式、材料特性还是理论研究等各方面都日趋完善。随着丰富的设计经验积累和先进的技术手段的运用，桥梁设计者们又进一步创新优化结构体系，使得矮塔斜拉桥在跨径、宽度指标等各方面不断刷新突破。在我国，由于人口密集，，城市道路普遍都很宽，为了更好的结合城市道路的发展，矮塔斜拉桥也是越来越宽，已修建的矮塔斜拉桥平均宽度都在30m以上，宽幅的矮塔斜拉桥占据了绝对的主导地位。虽说在国内宽幅矮塔斜拉桥得到了很大的发展，且结构整体内力分布特点也都是大家非常熟悉的，但是在某些局部位置应力分布仍然不甚清晰，如全桥主梁的0号块，不但其自身构造复杂，而且其作用荷载也是十分多变的，在设计时比较难以把握；同时宽幅矮塔斜拉桥很宽的桥面使得其主梁结构通常采用多室箱梁，在外荷载作用下将产生应力分布不均现象，尤其是在拉索的作用下，分布不均现象更是十分严重；此外在施工监控中也有部分影响到全桥受力安全的关键技术，且暂时未得到广泛运用。针对以上情况，本文详细总结了宽幅矮塔斜拉桥在设计、施工监控中的部分关键技术及其研究方法，并以颍河矮塔斜拉桥为工程背景，首先运用桥梁博士3.1.0杆系有限元模型详细的分析了颍河大桥的整体受力特性，随后结合ANSYS12.0空间实体有限元软件分析了颍河大桥0号块在体系变换前、后的应力变化及成桥阶段的应力分布特点，最后在颍河大桥标准截面的基础上稍作修改，运用对称性原理建立了整个悬臂段的ANSYS实体模型，并结合运用MIDAS/CIVIL2010建立的杆系模型对比分析了主梁结构的剪力滞效应及其纵向位移函数，全文对于此类桥型的设计、施工监控以及多室箱梁的剪力滞效应理论研究均具有一定的参考意义。
[Abstract]:As a new type of bridge structure, the low tower cable-stayed bridge has been developed for only 30 years, but its development is in the form of structure. With the accumulation of rich design experience and the application of advanced technical means, bridge designers have further innovated and optimized the structure system to make the cable-stayed bridge with low tower in the span. In our country, due to the population density, urban roads are generally very wide, in order to better integrate the development of urban roads, the low tower cable-stayed bridges are becoming wider and wider. The average width of all the cable-stayed bridges with low towers has been over 30m, and the cable-stayed bridges with wide pylon have occupied an absolute dominant position. Although the cable-stayed bridges with wide pylon have been greatly developed in China, The internal force distribution of the whole structure is also very familiar, but the stress distribution is still not very clear at some local locations. For example, block 0 of the main girder of the whole bridge is not only complicated in its own structure, but also very changeable in its action load. At the same time, the wide width and short tower cable-stayed bridge has very wide deck, which makes the main girder structure usually use multi-chamber box girder, and the stress distribution will be uneven under the external load, especially under the action of cable. The phenomenon of uneven distribution is very serious, in addition, there are some key technologies which affect the safety of the whole bridge in construction monitoring, and have not been widely used for the time being. In view of the above situation, this paper summarizes in detail the design of the cable-stayed bridge with wide and low pylon. Some key techniques and their research methods in construction monitoring and control are discussed. Taking Yinghe low Tower Cable-Stayed Bridge as the engineering background, firstly, the integral mechanical characteristics of Yinghe Bridge are analyzed in detail by using the finite element model of the bridge's PhD 3.1.0 bar system. Then, the stress change and stress distribution in the completion stage of Yinghe Bridge block 0 before and after the system transformation are analyzed by using ANSYS12.0 spatial entity finite element software. Finally, a slight modification is made on the basis of the standard section of Yinghe Bridge. The ANSYS solid model of the whole cantilever section is established by using the symmetry principle, and the shear lag effect and the longitudinal displacement function of the main beam structure are compared and analyzed by using the bar system model established by MIDAS/CIVIL2010. In this paper, the design of this kind of bridge is presented. Construction monitoring and theoretical study of shear lag effect of multi-chamber box girder have certain reference significance.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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