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    Experimental Study of Sliding Base-Isolated Buildings with Magnetorheological Dampers in Near-Fault Earthquakes

    Source: Journal of Structural Engineering:;2005:;Volume ( 131 ):;issue: 007
    Author:
    Sanjay Sahasrabudhe
    ,
    Satish Nagarajaiah
    DOI: 10.1061/(ASCE)0733-9445(2005)131:7(1025)
    Publisher: American Society of Civil Engineers
    Abstract: The increase in bearing displacements of sliding isolated buildings due to near-fault earthquakes, with long-period pulse type of ground motion, is an important problem. Often, supplemental nonlinear passive dampers are incorporated into the isolation system to reduce the base displacements; however, this may increase the interstory drifts and accelerations in the superstructure. Hence, there is a need to examine whether controllable nonlinear dampers can reduce the base displacements without a further increase in superstructure response. In this study, the effectiveness of variable damping, provided by magnetorheological (MR) dampers, in reducing the response of sliding isolated buildings during near-fault earthquakes is investigated using a 1:5 scale steel two-story model. A nonlinear analytical model is developed with due consideration given to the nonlinearities of the friction bearings and the MR damper. A Lyapunov-based control algorithm is developed for control of the MR damper and the building model, and tested on a shake table. Results of passive low/high damping cases and semiactive cases are compared. It is shown that the variable damping reduces base displacements and superstructure responses further than passive low/high damping cases.
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      Experimental Study of Sliding Base-Isolated Buildings with Magnetorheological Dampers in Near-Fault Earthquakes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/34572
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    contributor authorSanjay Sahasrabudhe
    contributor authorSatish Nagarajaiah
    date accessioned2017-05-08T20:59:27Z
    date available2017-05-08T20:59:27Z
    date copyrightJuly 2005
    date issued2005
    identifier other%28asce%290733-9445%282005%29131%3A7%281025%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/34572
    description abstractThe increase in bearing displacements of sliding isolated buildings due to near-fault earthquakes, with long-period pulse type of ground motion, is an important problem. Often, supplemental nonlinear passive dampers are incorporated into the isolation system to reduce the base displacements; however, this may increase the interstory drifts and accelerations in the superstructure. Hence, there is a need to examine whether controllable nonlinear dampers can reduce the base displacements without a further increase in superstructure response. In this study, the effectiveness of variable damping, provided by magnetorheological (MR) dampers, in reducing the response of sliding isolated buildings during near-fault earthquakes is investigated using a 1:5 scale steel two-story model. A nonlinear analytical model is developed with due consideration given to the nonlinearities of the friction bearings and the MR damper. A Lyapunov-based control algorithm is developed for control of the MR damper and the building model, and tested on a shake table. Results of passive low/high damping cases and semiactive cases are compared. It is shown that the variable damping reduces base displacements and superstructure responses further than passive low/high damping cases.
    publisherAmerican Society of Civil Engineers
    titleExperimental Study of Sliding Base-Isolated Buildings with Magnetorheological Dampers in Near-Fault Earthquakes
    typeJournal Paper
    journal volume131
    journal issue7
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)0733-9445(2005)131:7(1025)
    treeJournal of Structural Engineering:;2005:;Volume ( 131 ):;issue: 007
    contenttypeFulltext
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