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Wind and Structures
  Volume 2, Number 2, June 1999, pages 95-104
DOI: http://dx.doi.org/10.12989/was.1999.2.2.095
 


Experimental analysis of aerodynamic stability of stree-ribbon footbridges
Miros Pirner and Ondrej Fischer

 
Abstract
    The dynamic properties of one-span or multi-span reinforced concrete footbridges of catenary form (see e.g., Fig. 1) include the very low fundamental natural frequency, usually near the step-frequency of pedestrians, and the low damping of bending vibrations. The paper summarized the results of model as well as full-scale measurements with particular reference to the influence of torsional rigidity of the stress-ribbon on the magnitude of aerodynamic response, the results of measurements on footbridges of catenary form being completed by results obtained on footbridges of some other types. Additionally the influence of the local broadening of the bridge deck on the bridge response was tested. Starting from these results the criterion has been drived for the decision, whether the flutter analysis is necessary for the design of the footbridge.
 
Key Words
    footbridge; aerodynamic stability; bending-torsional vibration; wind-excited vibrations; wind-tunnel in civil engineering.
 
Address
Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, Prosecka 76, 190 00 Praha 9, Czech Republic
 

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