Research on computational method of critical wind speed of tubular members of superhigh voltage transmission steel tubular towers

The results show that the flutter critical wind speed can be significantly increased by mounting an upper central stabilizing barrier on the top surface of the upper chords of the transverse frames of the truss girder,and the flutter .

The variation pattern between flutter critical wind speed of bridge with flat box deck and wind yaw angle is significantly affected by wind attack angle.

Thus the flutter critical wind speeds are much lower and the bridge is more unstable during this period.

Numerical simulations for aerodynamic derivatives and critical flutter velocity of bridge deck;

With the span of long-span bridges is becoming longer, the stiffness and damping ratio of structures decrease clearly and then critical flutter velocity falls accordingly.

According to the characteristics of large spatial reticulated structures, this paper derived the galloping critical wind speed discriminent expressed with shape coefficient rather than lift and drag coefficient when taking into account the initial attack angle and lateral aerodynamic force and mutual interaction between ver.

Using computational fluid dynamics (CFD) method we studied the critical flutter wind speed of bridge box girder with or without central slot.

The effects of wind velocity,sag-span-ratio,span,conductor diameter on galloping critical wind velocity and amplitude are studied and approximate method to calculate galloping characteristic of quasi-oval iced conductor are presented at last.