由动态阻尼特性判断结构颤振的临界风速

Determining Critical Velocity of Structure Flutter with Characteristics of Dynamical Damping

将航空理论中的飞机机翼颤振的分析方法 U- g法引入到桥梁颤振的研究中 ,从而可以由结构的动态阻尼特性 ,即由 g随来流风速 U或由对数衰减率 dk 随折减速度的变化曲线 ,来判断桥梁发生颤振的临界风速 ,并就具体的算例进行了研究 .良好的结果验证了该方法在土木工程中的适用性 .

Various analyzing methods of bridge flutter are summarized, and the U-g method used in the analysis of airplane wings flutter in aviation theory is introduced into the researches of bridge flutter. The critical velocity of bridge when it begins to flutter can be determined with characteristics of structure dynamical damping, i.e. diagrams of g versus income wind velocity U, or logarithm decline rate versus reduced velocity. The critical velocity of two bridges are studied, the results validate the applicability of the method in civil engineering.