DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
DESIGN SPECIFICATIONS FOR HIGHWAY BRIDGES - IISEE
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(4) Design of superstructural end of a seismically-isolated bridge shall be based on<br />
Section 14.4.<br />
9.3 Analytical Model of Isolation Bearings<br />
9.3.1 General<br />
An isolation bearing can be modeled as a nonlinear member having inelastic hysteretic<br />
property or an equivalent linear member having equivalent stiffness and damping<br />
ratio. In the case of modeling an isolation bearing as a nonlinear member, reference<br />
shall be made to provisions in Section 9.3.2. In the case of modeling an isolation<br />
bearing as an equivalent linear member, design displacement and equivalent stiffness<br />
and damping ratio of the bearing shall be based on Section 9.3.3.<br />
9.3.2 Inelastic Hysteretic Model of Isolation Bearings<br />
In modeling an isolation bearing as a nonlinear member, a bilinear model illustrated in<br />
Fig. 9.3.1 shall be employed. In this case the initial stiffness and secondary stiffness<br />
shall be appropriately determined according to its properties.<br />
Fig. 9.3.1 Inelastic Hysteretic Model of Isolation Bearing<br />
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