大跨度公铁两用斜拉桥风致抖振时域分析及挡风屏影响研究

发布时间：2018-01-12 10:25

本文关键词：大跨度公铁两用斜拉桥风致抖振时域分析及挡风屏影响研究　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着铁路建设新时代的到来,公铁两用的大跨度桥梁逐渐增多,斜拉桥在这一领域的角色也愈加重要。而铁路运营速度和安全性要求的增加,风对桥梁结构的作用和桥梁结构的抗风性能也受到更多重视,抖振响应是桥梁结构风致响应中典型振动响应之一,其会对桥梁结构造成的行车舒适问题和疲劳破坏,有必要对此进行研究。同时,出于改善和提高桥上行车安全的考虑,在桥上设置挡风屏是十分有效的途径之一,但设置挡风屏后,可能会对桥梁结构产生不利的影响,因此研究设置挡风屏对桥梁抖振响应的影响也是本文的重要议题之一。本文以某大跨度公铁两用斜拉桥为工程实例,对其进行抖振响应分析计算。具体包括以下几个方面：1.阐述了桥梁风工程基本理论以及桥梁结构三维抖振响应的计算理论,针对大跨度公铁两用桥梁的特点和桥位处风特性,对其三维风场进行简化模拟。2.基于XNJD-1风洞的节段段模型试验所得到三分力系数,计算出风对桥梁结构的静力和动力荷载,并进行时域化处理,从而实现在有限元软件中加载。3.利用ANSYS软件建立该桥梁的有限元模型,进行抖振时域分析,分析讨论了是否考虑气动导纳和是否设置挡风屏对结构抖振性能的影响。4.总结了在本文中所做的研究工作,并将所得成果以图片和表格的形式给出,最后陈述出进一步需要进行研究的方法和注意的问题。
[Abstract]:With the arrival of a new era of railway construction, the number of large-span bridges for both road and rail is gradually increasing, and the role of cable-stayed bridges in this field is becoming more and more important. More attention has been paid to the effect of wind on bridge structure and the anti-wind performance of bridge structure. Buffeting response is one of the typical vibration responses of bridge structure. It is necessary to study the problem of driving comfort and fatigue damage caused by the bridge structure. At the same time, it is necessary to improve and improve the safety of driving on the bridge. It is one of the most effective ways to install the windscreen on the bridge, but the installation of the windshield may have a negative effect on the bridge structure. Therefore, it is also one of the important topics in this paper to study the effect of installing windscreen on buffeting response of bridges. In this paper, a large span double-purpose cable-stayed bridge is taken as an engineering example. The buffeting response is analyzed and calculated, including the following aspects: 1. The basic theory of bridge wind engineering and the calculation theory of three-dimensional buffeting response of bridge structure are expounded. According to the characteristics of the large-span dual-purpose bridge and the wind characteristics at the bridge location, the three-dimensional wind field of the bridge is simplified. 2. The three-point force coefficient is obtained by the segmental model test based on XNJD-1 wind tunnel. The static and dynamic loads of the bridge structure caused by wind are calculated, and the time-domain treatment is carried out to realize the loading of .3.The finite element model of the bridge is established by using ANSYS software. The buffeting time domain analysis is carried out, and the effects of aerodynamic admittance and windshield on buffeting performance are discussed. 4. The research work done in this paper is summarized. The results are given in the form of pictures and tables. Finally, the methods and problems needing further research are stated.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3;U448.27

【参考文献】