大跨度人行悬索桥抗风稳定性研究

发布时间：2018-01-20 23:43

本文关键词： 大跨度悬索桥风致振动抗风稳定性颤振稳定性涡振性能节段模型风洞试验　出处：《湖南大学》2014年硕士论文　论文类型：学位论文

【摘要】：悬索桥作为世界上最古老的桥型之一，其跨越能力也是所有桥型里最大的，现代悬索桥跨度基本都在1000m以上。1940年塔克马(Tacoma)悬索桥风毁事故后，工程师们开始重视工程设计中的风致振动问题，并展开了一系列的桥梁抗风稳定性研究工作。大跨悬索桥的抗风稳定性研究重点主要在于桥梁颤振稳定性和涡振性能方面的研究。正在筹建的张家界人行悬索桥，目前正处于初步设计阶段。该桥基于美学的考虑，将主梁断面初步拟定成了钝体形式的断面，主梁高跨比1/641.6667，远小于旧塔科马桥1/348的高跨比，该桥比旧塔科马桥更柔。张家界人行悬索桥重量也很轻，为每米3.933吨。如此轻且细长的桥梁结构，在风的动力作用下，其风致振动问题将会是影响结构设计的控制因素。本文以张家界人行悬索桥为工程背景，在现有颤振和涡振分析方法的基础上，通过节段模型风洞试验，，对大跨度悬索桥抗风稳定性问题进行了研究。本论文的主要研究内容有： 1、回顾了悬索桥的发展历史，并对桥梁的风致振动现象做了简要的介绍。介绍了桥梁抗风稳定性的分析理论，并归纳了气动、结构、机械减振三个方面的风致振动控制措施。 2、结合张家界人行悬索桥的工程概况，进行了初步设计方案中的颤振检验风速计算、全桥动力特性分析及节段模型设计等准备工作。 3、基于外倾式玻璃护栏的初步设计方案，通过风洞试验识别了在三种气动措施组合工况下的8个颤振导数，并依此建立了张家界人行悬索桥颤振分析有限元模型，分析讨论了三种气动措施所带来的颤振稳定性效果。 4、提出了一种较佳的主梁气动断面形式，并对主梁的刚性节段模型进行了抗风性能风洞测振试验研究，得到了气动改形后加劲梁的颤振稳定性和涡振性能结果。
[Abstract]:As one of the oldest bridge types in the world, suspension bridge has the largest span ability of all bridges. The span of modern suspension bridges is almost more than 1000m. After the wind damage accident of Tacoma Bridge in 1940, engineers began to attach importance to the wind-induced vibration in engineering design. A series of research work on the wind-resistant stability of bridges has been carried out. The study on wind-resistant stability of long-span suspension bridge is mainly focused on the flutter stability and vortex-vibration performance of the bridge. At present, the bridge is in the preliminary design stage. Based on aesthetic considerations, the section of the main beam is initially drawn up as a blunt body section, the ratio of height to span of the main beam is 1 / 641.6667. Far less than the 1/348 height-span ratio of the old Tacoma Bridge, the bridge is softer than the old Tacoma Bridge. The suspension bridge in Zhangjiajie is also light, at 3.933 tons per meter. It is such a light and slender bridge structure. Under the dynamic action of wind, the wind-induced vibration problem will be the control factor of the structure design. This paper takes the Zhangjiajie pedestrian suspension bridge as the engineering background, based on the existing flutter and vortex vibration analysis methods. The wind-resistant stability of long-span suspension bridge is studied by wind tunnel test with segmental model. The main contents of this thesis are as follows: 1. The development history of suspension bridge is reviewed, and the wind-induced vibration phenomenon of the bridge is briefly introduced. The analysis theory of the bridge anti-wind stability is introduced, and the aerodynamic and structure are summarized. Control measures of wind-induced vibration in three aspects of mechanical vibration reduction. 2. Combined with the general situation of Zhangjiajie pedestrian suspension bridge, the flutter test wind speed calculation, the dynamic characteristic analysis of the whole bridge and the design of the segmental model are carried out in the preliminary design scheme. 3. Based on the preliminary design scheme of extroverted glass guardrail, eight flutter derivatives are identified by wind tunnel test under the combined working conditions of three kinds of pneumatic measures. A finite element model for flutter analysis of Zhangjiajie pedestrian suspension bridge is established, and the flutter stability effect brought by three kinds of pneumatic measures is analyzed and discussed. 4. A better aerodynamic section form of the main beam is proposed, and the wind tunnel vibration test of the rigid segment model of the main girder is carried out. The flutter stability and vortex vibration performance of the stiffened beam are obtained.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U441.3

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