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    Stability of Elastomeric Seismic Isolation Bearings

    Source: Journal of Structural Engineering:;1999:;Volume ( 125 ):;issue: 009
    Author:
    Satish Nagarajaiah
    ,
    Keith Ferrell
    DOI: 10.1061/(ASCE)0733-9445(1999)125:9(946)
    Publisher: American Society of Civil Engineers
    Abstract: Elastomeric seismic isolation bearings are subjected to large axial loads and lateral displacements during strong earthquakes. The existing Koh-Kelly model for elastomeric bearings accounts for axial load effects on horizontal stiffness. This linear model is based on small displacements and rotations and predicts stable postcritical behavior or increasing critical load with increasing horizontal displacement; however, unstable postcritical behavior is observed in the bearing test results presented in this study. The analytical model developed in this study, based on the Koh-Kelly model, includes large displacements, large rotations, and nonlinearity of rubber, and it predicts unstable postcritical behavior. The formulation of the analytical model, calibration, and verification using experimental results are presented. It is shown that: (1) the critical load reduces with increasing horizontal displacement; and (2) the horizontal stiffness reduces with increasing horizontal displacement and axial load. It is also shown that the critical load capacity at a horizontal displacement equal to the width of the bearing is not equal to zero, as predicted by the approximate procedure used in design, but higher.
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      Stability of Elastomeric Seismic Isolation Bearings

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    http://yetl.yabesh.ir/yetl1/handle/yetl/33256
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    contributor authorSatish Nagarajaiah
    contributor authorKeith Ferrell
    date accessioned2017-05-08T20:57:29Z
    date available2017-05-08T20:57:29Z
    date copyrightSeptember 1999
    date issued1999
    identifier other%28asce%290733-9445%281999%29125%3A9%28946%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/33256
    description abstractElastomeric seismic isolation bearings are subjected to large axial loads and lateral displacements during strong earthquakes. The existing Koh-Kelly model for elastomeric bearings accounts for axial load effects on horizontal stiffness. This linear model is based on small displacements and rotations and predicts stable postcritical behavior or increasing critical load with increasing horizontal displacement; however, unstable postcritical behavior is observed in the bearing test results presented in this study. The analytical model developed in this study, based on the Koh-Kelly model, includes large displacements, large rotations, and nonlinearity of rubber, and it predicts unstable postcritical behavior. The formulation of the analytical model, calibration, and verification using experimental results are presented. It is shown that: (1) the critical load reduces with increasing horizontal displacement; and (2) the horizontal stiffness reduces with increasing horizontal displacement and axial load. It is also shown that the critical load capacity at a horizontal displacement equal to the width of the bearing is not equal to zero, as predicted by the approximate procedure used in design, but higher.
    publisherAmerican Society of Civil Engineers
    titleStability of Elastomeric Seismic Isolation Bearings
    typeJournal Paper
    journal volume125
    journal issue9
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)0733-9445(1999)125:9(946)
    treeJournal of Structural Engineering:;1999:;Volume ( 125 ):;issue: 009
    contenttypeFulltext
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