Aerodynamic stability of long span suspension bridges with low torsional natural frequencies
- Resource Type
- Authors
- Svend Ole Hansen; Michael Styrk Andersen; Anders Brandt; Jens Johansson
- Source
- Andersen, M S, Johansson, J, Brandt, A & Hansen, S O 2016, ' Aerodynamic stability of long span suspension bridges with low torsional natural frequencies ', Engineering Structures, vol. 120, pp. 82–91 . https://doi.org/10.1016/j.engstruct.2016.04.025
- Subject
- Long span
Engineering
020101 civil engineering
02 engineering and technology
Stability (probability)
0201 civil engineering
Physics::Fluid Dynamics
Aerodynamics
0203 mechanical engineering
Wind–structure interaction
Aeroelasticity
Suspension (vehicle)
Physics::Atmospheric and Oceanic Physics
Civil and Structural Engineering
Wind tunnel
Torsional vibration
business.industry
Structural engineering
Flutter
020303 mechanical engineering & transports
Torsional divergence
Non-flutter design principle
Long-span bridge
Wind tunnel experiments
business
- Language
- ISSN
- 0141-0296
Classical flutter of suspended bridge decks can be avoided if the torsional frequencies are lower than the vertical. Wind tunnel tests of single boxes and twin box section models with torsional natural frequencies above and below the vertical frequency has been conducted. Flutter was avoided in all tests where the torsional frequency was lower than the vertical. But too low torsional stiffness caused large static displacements of the girder at medium–high wind speeds and steady state oscillations driven by a combination of torsional divergence and stalling behavior at the critical wind seed. In order to design aerodynamically stable suspension bridges with low torsional natural frequencies it is suggested to increase the mass moment of inertia and provide adequate torsional stiffness by the main cables spacing.