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    Structures with Semiactive Variable Stiffness Single/Multiple Tuned Mass Dampers

    Source: Journal of Structural Engineering:;2007:;Volume ( 133 ):;issue: 001
    Author:
    Satish Nagarajaiah
    ,
    Ertan Sonmez
    DOI: 10.1061/(ASCE)0733-9445(2007)133:1(67)
    Publisher: American Society of Civil Engineers
    Abstract: This paper proposes application of single and multiple semiactive variable stiffness tuned mass dampers (STMD/SMTMD) for response control of multistory structures under several types of excitation. A new semiactive control algorithm is developed based on real-time frequency tracking of excitation signal by short time Fourier transform. A parametric study is performed in the frequency domain to investigate the dynamic characteristics and effectiveness of STMDs. Time history responses of single-degree-of-freedom and five-degree-of-freedom structures equipped with STMDs at the roof level, subjected to harmonic, stationary, and nonstationary excitations are presented. STMD/SMTMD are most effective when they have low damping ratios and the excitation frequency can be tracked. They are superior than their passive counterparts in reducing the response of the main structure both under force and base excitations. In case the fundamental frequency changes due to damage or deterioration of the main structure then the TMD will be off-tune; hence, it will lose its effectiveness significantly, whereas, the STMD is robust against such changes as it is always tuned to the excitation frequency.
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      Structures with Semiactive Variable Stiffness Single/Multiple Tuned Mass Dampers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/34904
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    contributor authorSatish Nagarajaiah
    contributor authorErtan Sonmez
    date accessioned2017-05-08T21:00:01Z
    date available2017-05-08T21:00:01Z
    date copyrightJanuary 2007
    date issued2007
    identifier other%28asce%290733-9445%282007%29133%3A1%2867%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/34904
    description abstractThis paper proposes application of single and multiple semiactive variable stiffness tuned mass dampers (STMD/SMTMD) for response control of multistory structures under several types of excitation. A new semiactive control algorithm is developed based on real-time frequency tracking of excitation signal by short time Fourier transform. A parametric study is performed in the frequency domain to investigate the dynamic characteristics and effectiveness of STMDs. Time history responses of single-degree-of-freedom and five-degree-of-freedom structures equipped with STMDs at the roof level, subjected to harmonic, stationary, and nonstationary excitations are presented. STMD/SMTMD are most effective when they have low damping ratios and the excitation frequency can be tracked. They are superior than their passive counterparts in reducing the response of the main structure both under force and base excitations. In case the fundamental frequency changes due to damage or deterioration of the main structure then the TMD will be off-tune; hence, it will lose its effectiveness significantly, whereas, the STMD is robust against such changes as it is always tuned to the excitation frequency.
    publisherAmerican Society of Civil Engineers
    titleStructures with Semiactive Variable Stiffness Single/Multiple Tuned Mass Dampers
    typeJournal Paper
    journal volume133
    journal issue1
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)0733-9445(2007)133:1(67)
    treeJournal of Structural Engineering:;2007:;Volume ( 133 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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