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    Vertical Accelerations in Rolling Isolation Systems: Experiments and Simulations

    Source: Journal of Engineering Mechanics:;2016:;Volume ( 142 ):;issue: 003
    Author:
    P. S. Harvey
    DOI: 10.1061/(ASCE)EM.1943-7889.0001017
    Publisher: American Society of Civil Engineers
    Abstract: Rolling isolation systems (RISs) have been used extensively to protect bridges, buildings, and equipment from earthquake-induced ground and floor motions. RISs are attractive in a performance-based design context because horizontal acceleration design requirements may easily be met by adjusting the slope of the rolling surface. However, in the process of reducing horizontal accelerations, the isolator transmits vertical accelerations due to the pendulumlike motion. These vertical accelerations may exceed tolerable limits if left unchecked. In this study, the influence of the rolling surface profile on peak vertical accelerations is assessed through experiments and simulations. RISs with different radii of curvature are fabricated and then tested for a wide range of ground-motion frequencies and amplitudes. The experiments and simulations show that vertical accelerations are not negligible and should not be ignored in the design of RISs.
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      Vertical Accelerations in Rolling Isolation Systems: Experiments and Simulations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4243046
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    contributor authorP. S. Harvey
    date accessioned2017-12-30T12:53:44Z
    date available2017-12-30T12:53:44Z
    date issued2016
    identifier other%28ASCE%29EM.1943-7889.0001017.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4243046
    description abstractRolling isolation systems (RISs) have been used extensively to protect bridges, buildings, and equipment from earthquake-induced ground and floor motions. RISs are attractive in a performance-based design context because horizontal acceleration design requirements may easily be met by adjusting the slope of the rolling surface. However, in the process of reducing horizontal accelerations, the isolator transmits vertical accelerations due to the pendulumlike motion. These vertical accelerations may exceed tolerable limits if left unchecked. In this study, the influence of the rolling surface profile on peak vertical accelerations is assessed through experiments and simulations. RISs with different radii of curvature are fabricated and then tested for a wide range of ground-motion frequencies and amplitudes. The experiments and simulations show that vertical accelerations are not negligible and should not be ignored in the design of RISs.
    publisherAmerican Society of Civil Engineers
    titleVertical Accelerations in Rolling Isolation Systems: Experiments and Simulations
    typeJournal Paper
    journal volume142
    journal issue3
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)EM.1943-7889.0001017
    page04015091
    treeJournal of Engineering Mechanics:;2016:;Volume ( 142 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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