超千米级跨度公铁两用钢桁梁斜拉桥抖振时域分析及施工期抗风措施研究
发布时间：2018-07-27 09:58
【摘要】：电子计算机技术的应用和新型材料的发明,极大地促进了现代桥梁的发展。斜拉桥以其特有的优势备受青睐。在已建或在建的斜拉桥中,大都具有塔高、跨大、柔性,弱阻尼的特点,从结构抗风性能讲,属于风敏结构。在抗风性能研究中,抖振在任何风速下都可能发生,对施工的安全性和成桥后的行车舒适度都会产生较大的影响,因此历来受到设计者的重视。本文以某公铁两用钢桁斜拉桥为例,对其成桥态和施工态分别进行抖振线性时域分析,并考察对施工态设置抗风索的抑振效果。内容框架有：1.斜拉桥发展及抗风理论知识简介。2.根据大跨度斜拉桥的构造特点和桥址处自然风的特性,将斜拉桥的三维脉动风场简化为各自独立的一维随机变量进行风场模拟。3.利用Ansys13.0建立有限元模型,并对成桥态和施工态进行动力特性分析,通过风洞试验得到静风三分力系数,并对三分力系数拟合得到各自的三分力一阶导数。4.通过CFD软件计算出桥塔各段的阻力系数,对抖振力、气动自激力进行时域化处理,然后将其和静风力加载到某斜拉桥进行线性抖振时域分析。5.对施工最不利状态设置抗风索的抑振效果的考察。
[Abstract]:The application of computer technology and the invention of new materials have greatly promoted the development of modern bridges. Cable-stayed bridges are favored for their unique advantages. In the cable-stayed bridges built or under construction, most of them have the characteristics of tower height, span, flexibility and weak damping. In the study of wind resistance, buffeting may occur under any wind speed, which will have a great impact on the safety of construction and the driving comfort after completion of the bridge, so it has always been attached importance to by designers. Taking a steel truss cable-stayed bridge as an example, the buffeting linear time domain analysis of the bridge state and the construction state is carried out, and the effect of anti-wind cable on the vibration suppression is investigated. The content frame has a: 1. Brief introduction to the Development of Cable-Stayed Bridges and the knowledge of Wind Resistance Theory. According to the structural characteristics of the long-span cable-stayed bridge and the natural wind characteristics at the bridge site, the three-dimensional pulsating wind field of the cable-stayed bridge is simplified as a one-dimensional random variable to simulate the wind field of the cable-stayed bridge. The finite element model is established by using Ansys13.0, and the dynamic characteristics of bridge and construction state are analyzed. Through wind tunnel test, the static wind three-point force coefficient is obtained, and the first derivative of each three-point force is obtained by fitting the three-point force coefficient. The drag coefficient of each section of bridge tower is calculated by CFD software, and the buffeting force and aerodynamic self-excitation force are treated in time domain, and then loaded with static wind force into a cable-stayed bridge for linear buffeting time domain analysis .5. Study on the vibration suppression effect of wind cable in the most unfavorable state of construction.
【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
本文编号：2147465
[Abstract]:The application of computer technology and the invention of new materials have greatly promoted the development of modern bridges. Cable-stayed bridges are favored for their unique advantages. In the cable-stayed bridges built or under construction, most of them have the characteristics of tower height, span, flexibility and weak damping. In the study of wind resistance, buffeting may occur under any wind speed, which will have a great impact on the safety of construction and the driving comfort after completion of the bridge, so it has always been attached importance to by designers. Taking a steel truss cable-stayed bridge as an example, the buffeting linear time domain analysis of the bridge state and the construction state is carried out, and the effect of anti-wind cable on the vibration suppression is investigated. The content frame has a: 1. Brief introduction to the Development of Cable-Stayed Bridges and the knowledge of Wind Resistance Theory. According to the structural characteristics of the long-span cable-stayed bridge and the natural wind characteristics at the bridge site, the three-dimensional pulsating wind field of the cable-stayed bridge is simplified as a one-dimensional random variable to simulate the wind field of the cable-stayed bridge. The finite element model is established by using Ansys13.0, and the dynamic characteristics of bridge and construction state are analyzed. Through wind tunnel test, the static wind three-point force coefficient is obtained, and the first derivative of each three-point force is obtained by fitting the three-point force coefficient. The drag coefficient of each section of bridge tower is calculated by CFD software, and the buffeting force and aerodynamic self-excitation force are treated in time domain, and then loaded with static wind force into a cable-stayed bridge for linear buffeting time domain analysis .5. Study on the vibration suppression effect of wind cable in the most unfavorable state of construction.
【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】
相关期刊论文 前5条
1 司学通;郭文华;;斜拉桥最大悬臂阶段抖振响应及其对施工人员影响[J];桥梁建设;2007年04期
2 徐洪涛;马存明;廖海黎;李明水;;大跨钢桁架梁气动选型及气动参数风洞试验研究[J];铁道建筑;2010年10期
3 曹映泓,项海帆,周颖;大跨度桥梁随机风场的模拟[J];土木工程学报;1998年03期
4 曹映泓,项海帆,周颖;大跨度桥梁颤振和抖振统一时程分析[J];土木工程学报;2000年05期
5 郑史雄;李永乐;陶奇;;天兴洲公铁两用长江大桥气动参数风洞试验[J];中国铁道科学;2007年02期
相关硕士学位论文 前2条
1 秦建军;大跨度斜拉桥最大悬臂施工状态抖振响应及控制研究[D];湖南大学;2004年
2 张晋媛;大跨度斜拉桥线性抖振时域分析[D];西南交通大学;2010年
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