摘要
利用我们开发的国内第一个强迫振动法试验方法 ,研究了三种不同断面的桥梁颤振自激力特性和Scanlan提出的颤振导数理论的若干假定。研究表明 ,在实用风速范围内 ,颤振导数基本与测试频率、振幅无关 ;流线断面的自激力能基本符合Scanlan的线性假定 ,但钝体断面的自激力高次谐波分量大 ,明显具有对模型运动的非线性响应特征。
A new method for measuring the flutter self?excited forces of long?scale bridges is propsed in the paper.It is called that the forced vibration method is first developed in China.The aerodynamic characteristics of three sectional models are studied through wind tunnel test.The scanlan′s assumptions of flutter derivation are discussed.It is found that the flutter derivatives are dependent from the amplitude and frequency in the practical range of wind speed.The self?excited forces of a streamline section are in agreement with Scanlan′s assumption;there are quite different for the bluff section.It is found that it is contained large components of the high order harmonious wave;it is notable nonlinear responses.
出处
《土木工程学报》
EI
CSCD
北大核心
2002年第5期34-41,共8页
China Civil Engineering Journal
基金
国家自然科学基金面上项目(59778043)与重大项目(59895410)
铁道部重点学科基金联合资助
关键词
大跨桥梁
自激力
颤振导数
强迫振动法
bridge,self-excited forces
flutter derivative
forced vibration method
