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Given the considerable flexibility of long span bridges, in many cases it is recommended to consider the natural turbulent characteristics of the wind action. Detailed wind effects studies are based on the determination of structural design loads and the identification of possible aerodynamic instabilities in the structural response. This is achieved through wind tunnel studies using a section model of the bridge deck, or a full aeroelastic model of the complete bridge. The testing methodology allows for the study of design details, including the structural response during the construction phase, cable induced vibrations, railing details, etc.

Boundary layer wind tunnel studies identify possible bridge instabilities and provide equivalent static design loads. The testing and analysis methodology includes structural damping and modal contributions and turbulence conditions expected at the site.

Section model tests analyze the response and aerodynamic characteristics of the bridge deck. The dynamic tests evaluate the distinct instabilities (vortex induced vibrations, flutter, etc) and the associated aerodynamic derivatives, instability limits and structural response.

For particularly flexible bridges, a specific study on the fluid/structure interaction is often recommended. These test include modeling of the dynamic properties of the complete bridge to predict the background and resonant components of the response for detection of aeroelastic phenomena and equivalent static design loads on the complete bridge.

For more information, please contact O&B.


High speed rail bridge over the Almonte river

Oritia & Boreas S.L. B18924175. OFICINAS: Calle Ojos del S alado 100, 18008 Granada, Spain. LABORATORIO: LACIAD, Avda. de la Serrezuela 14, 18130, Escúzar. Granada. España - info@oritiayboreas.com - Tlf. 958 10 94 94 - Fax 958 71 55 29

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