大跨度桥梁颤振稳定性的简化判别

Simplified Criterion for Flutter Stability of Long-Span Bridges

讨论了大跨桥梁两种颤振理论的临界风速实用计算公式，并给出了一个统一表达形式的临界风速近似估算公式．讨论了攻角对颤振形态和Ｔｈｅｏｄｏｒｓｏｎ数的影响．最后提出了一个大跨桥梁颤振稳定性的简化判据，供桥梁初步设计阶段进行抗风设计使用．

This paper deals with the practical calculation formulae for critical wind speed obtained from two flutter theories of long-span bridges. A. unified expression for the estimation of critical wind speed is presented. And the effect of the attack angle on the nutter pattern and the Theodorson number is also discussed. Finally, a simplified criterion for flutter stability of long-span bridges is suggested for the use of wind-resistant assessment in the preliminary design stage.