钢混梁独塔斜拉桥设计关键问题研究

发布时间：2019-02-21 17:48

【摘要】：斜拉桥作为一种常见的大跨径桥型,造型样式多变,结构受力复杂,故在进行斜拉桥设计的时候对构件尺寸、连接方式、长宽高度的合理选取十分重要。而在把传统的斜拉桥和混合梁结合在一起后,对关键截面的动静力分析也是必不可少的。目前设计者们对典型的双塔对称斜拉桥已研究的较多,这次作者选择对主梁为钢混梁的独塔斜拱塔这种异形斜拉桥进行研究分析。本文首先介绍了国内外著名的独塔斜拉桥,而后以合肥某大桥为工程实例,利用Midas Civil有限元软件进行全桥分析,利用ANSYS有限元软件进行局部分析。具体研究内容可以概括为以下几点：(1)对某大桥建模,进行常规的静力分析,包括过渡墩支反力、主梁刚度、主梁内力、桥塔受力、斜拉索受力等；对钢混段局部建模,分析关键部位的内力情况。(2)在Midas Civil全桥模型的基础上进行静力参数敏感性分析,得出不同参数对斜拉桥结构受力的影响程度,并为独塔斜拉桥设计提出合理建议。(3)在Midas Civil全桥模型的基础上求解动力特性,分别用反应谱法和时程法对全桥和局部进行抗震分析。本文的结论成果可为今后类似钢混独塔斜拉桥的设计提供参考借鉴。
[Abstract]:As a common type of long span bridge, cable-stayed bridge is characterized by changeable modeling style and complicated structure. Therefore, it is very important to choose the reasonable selection of component size, connection mode and height of length and width in the design of cable-stayed bridge. After the traditional cable-stayed bridge and hybrid beam are combined, it is necessary to analyze the dynamic and static forces of the key section. At present, many designers have studied the typical double-tower symmetrical cable-stayed bridge. This time, the author has chosen to study and analyze the special-shaped cable-stayed bridge with single-tower inclined arch tower with the main beam as the steel-concrete beam. This paper first introduces the famous cable-stayed bridge with single tower at home and abroad. Then taking a bridge in Hefei as an engineering example, the whole bridge is analyzed by Midas Civil finite element software and local analysis is carried out by ANSYS finite element software. The specific research contents can be summarized as follows: (1) the conventional static analysis of a bridge is carried out, including the support reaction force of the transition pier, the stiffness of the main beam, the internal force of the main beam, the stress of the bridge tower, the force of the stayed cable, etc. The local model of steel concrete section is used to analyze the internal force of the key parts. (2) based on the Midas Civil model, the sensitivity of static parameters is analyzed, and the influence of different parameters on the stress of cable-stayed bridge is obtained. Reasonable suggestions for the design of single-tower cable-stayed bridge are put forward. (3) based on the Midas Civil full-bridge model, the dynamic characteristics of the bridge are solved, and the seismic analysis of the whole bridge and the local bridge is carried out by using the response spectrum method and the time-history method respectively. The results of this paper can be used for reference for the design of similar steel-concrete single-tower cable-stayed bridge in the future.
【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】：U442.5

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