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    Numerical and Experimental Evaluation of the Dynamic Performance of a Footbridge with Tuned Mass Dampers

    Source: Journal of Bridge Engineering:;2016:;Volume ( 021 ):;issue: 008
    Author:
    Katrien Van Nimmen
    ,
    Pieter Verbeke
    ,
    Geert Lombaert
    ,
    Guido De Roeck
    ,
    Peter Van den Broeck
    DOI: 10.1061/(ASCE)BE.1943-5592.0000815
    Publisher: American Society of Civil Engineers
    Abstract: This article presents an evaluation of the dynamic behavior of a slender steel footbridge before and after the installation of two tuned mass dampers (TMDs). The results of the experimental study show that the damping devices lead to an increase of the effective damping ratio of the critical mode. Additional tests involving the structural vibrations induced by a limited number of persons revealed that the TMD units are effective in reducing the structural response. However, the obtained reduction highly depends on the type of human excitation. To verify the response of the footbridge for large groups and crowds, a comprehensive numerical analysis is performed. The results are compared to the response predicted by the procedures of the Sétra and HiVoSS design guides. For the bridge without TMD units, a significantly higher structural response is predicted by the design guides; the bridge has a short span and is lightly damped, so the steady-state resonant conditions assumed in the design guides are not reached for pedestrians who cross the bridge at a normal walking speed. For the bridge with TMD units, the design guides predict a significantly lower structural response than do the more detailed numerical simulations because the critical mode is highly damped and no longer dominates the structural response. In addition, the effectiveness of the damping devices is considerably less than that expected on the basis of the corresponding increase in effective damping ratio because crowd-induced loading is near-harmonic and transient, not harmonic.
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      Numerical and Experimental Evaluation of the Dynamic Performance of a Footbridge with Tuned Mass Dampers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4245144
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    contributor authorKatrien Van Nimmen
    contributor authorPieter Verbeke
    contributor authorGeert Lombaert
    contributor authorGuido De Roeck
    contributor authorPeter Van den Broeck
    date accessioned2017-12-30T13:03:31Z
    date available2017-12-30T13:03:31Z
    date issued2016
    identifier other%28ASCE%29BE.1943-5592.0000815.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4245144
    description abstractThis article presents an evaluation of the dynamic behavior of a slender steel footbridge before and after the installation of two tuned mass dampers (TMDs). The results of the experimental study show that the damping devices lead to an increase of the effective damping ratio of the critical mode. Additional tests involving the structural vibrations induced by a limited number of persons revealed that the TMD units are effective in reducing the structural response. However, the obtained reduction highly depends on the type of human excitation. To verify the response of the footbridge for large groups and crowds, a comprehensive numerical analysis is performed. The results are compared to the response predicted by the procedures of the Sétra and HiVoSS design guides. For the bridge without TMD units, a significantly higher structural response is predicted by the design guides; the bridge has a short span and is lightly damped, so the steady-state resonant conditions assumed in the design guides are not reached for pedestrians who cross the bridge at a normal walking speed. For the bridge with TMD units, the design guides predict a significantly lower structural response than do the more detailed numerical simulations because the critical mode is highly damped and no longer dominates the structural response. In addition, the effectiveness of the damping devices is considerably less than that expected on the basis of the corresponding increase in effective damping ratio because crowd-induced loading is near-harmonic and transient, not harmonic.
    publisherAmerican Society of Civil Engineers
    titleNumerical and Experimental Evaluation of the Dynamic Performance of a Footbridge with Tuned Mass Dampers
    typeJournal Paper
    journal volume21
    journal issue8
    journal titleJournal of Bridge Engineering
    identifier doi10.1061/(ASCE)BE.1943-5592.0000815
    pageC4016001
    treeJournal of Bridge Engineering:;2016:;Volume ( 021 ):;issue: 008
    contenttypeFulltext
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