基于静三分力系数的大跨径桥梁气动稳定性的评价及其应用

发布时间：2018-07-07 13:32

本文选题：大跨桥梁 + 静三分力系数　；参考：《长安大学》2014年硕士论文

【摘要】：静三分力系数曲线走向直接关系到静风荷载的大小，当静三分力曲线趋于平缓时，结构对风荷载的敏感程度，结构就受风荷载的影响就越小。研究表明：静三分力系数与静力稳定问题中扭转发散和侧倾失稳，，动力问题中的驰振、涡振和抖振都有密切关系，而关于对静三分力系数和颤振稳定性能关系的研究却很少，本文主要研究静三分力系数和颤振稳定性能的关系，并应用其判断桥梁典型断面的颤振稳定性能及其抗风措施的优劣。本文基于准定常理论的频域分析法，建立颤振导数和静三分力系数的关系，然后以颤振导数为翘板，分析静三分力系数对颤振过程中的气动刚度和气动阻尼的影响，进而得出静三分力系数和颤振稳定性能的关系。并且通过对颤振机理的分析，得出影响桥梁结构颤振的关键气动阻尼项，进一步分析静三分力系数和颤振稳定性能的关系。通过静三分力系数和颤振稳定性能的关系分析得出判断大跨桥梁断面颤振稳定性能的F参数公式，并利用F参数来判断典型断面的颤振稳定性能和评价断面抗风措施的优劣。最后本文选取大跨桥梁的几种典型断面，包括桁架断面（刘家峡大桥）、闭合刚箱断面（虎门二桥）、中央开槽断面（西堠门大桥、港珠澳大桥）以及人行索桥（天蒙人行索桥），利用其断面静三分力系数来快速判断其颤振稳定性能或者评价抗风措施的的优劣。
[Abstract]:The direction of the static three-point force coefficient curve is directly related to the magnitude of the static wind load. When the static three-point force curve tends to be gentle, the sensitivity of the structure to the wind load will become smaller and the structure will be less affected by the wind load. The results show that the static three-point force coefficient is closely related to the torsional divergence and roll instability in the static stability problem, the galloping vibration, the vortex vibration and the buffeting vibration in the dynamic problem, but there is little research on the relationship between the static three-point force coefficient and the flutter stability performance. This paper mainly studies the relationship between static force coefficient and flutter stability performance, and applies it to judge the flutter stability performance of typical section of bridge and the advantages and disadvantages of wind-resistant measures. Based on the frequency domain analysis method of quasi-stationary theory, the relationship between flutter derivative and static three-point force coefficient is established, and then the influence of static three-point force coefficient on aerodynamic stiffness and damping in flutter process is analyzed with flutter derivative as tilting plate. The relationship between static force coefficient and flutter stability is obtained. Based on the analysis of flutter mechanism, the key aerodynamic damping terms affecting flutter of bridge structure are obtained, and the relationship between static force coefficient and flutter stability is further analyzed. Based on the analysis of the relationship between static force coefficient and flutter stability performance, the F parameter formula for judging flutter stability performance of long-span bridge section is obtained, and F parameters are used to judge flutter stability performance of typical section and evaluate the merits and demerits of section wind-resistant measures. Finally, several typical sections of the long-span bridge are selected, including truss section (Liujiaxia Bridge), closed rigid box section (Humen second Bridge), central slotted section (Xihoumen Bridge), Hong Kong-Zhuhai-Macao Bridge and pedestrian Cable Bridge (Tianmeng Bridge) are used to quickly judge the flutter stability and evaluate the wind-resistant measures by using the static three-point force coefficient of its section.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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