Structural and nonstructural performance of a seismically isolated building using stable unbonded fiber-reinforced elastomeric isolators

Document Type

Article

Publication Date

3-1-2016

Publication Title

Earthquake Engineering and Structural Dynamics

Volume

45

Issue

3

First Page

421

Keywords

Attached equipment, Base isolation, Fiber-reinforced elastomeric bearings, Modified support geometry (MSG), Nonstructural components and systems, Sliding equipment

Last Page

439

Abstract

Stable unbonded fiber-reinforced elastomeric isolators (SU-FREIs) exhibit a characteristic horizontal softening and stiffening response, similar to other adaptive devices such as the triple friction pendulum and sliding systems with variable curvature. The transition between the softening and stiffening occurs at a displacement corresponding to a unique deformation known as full rollover. In this paper, the full rollover displacement of SU-FREIs is altered by using modified support geometry (MSG), a geometric modification of the upper and lower supports applied to tailor the hysteresis loops of the isolator. Experimental results are used to calibrate a numerical model of a base-isolated structure. The model demonstrates that the stiffening regime provides minimal restraint against displacements during events that meet or exceed the maximum considered earthquake. A parametric study revealed that the level of stiffening required to restrain displacements during large events is significant. This increase in stiffness is reflected in an increase in the response of the structure and light nonstructural components. Full rollover and MSG is considered advantageous to maintain horizontal stability and provide control over the stiffening of SU-FREIs.

DOI

10.1002/eqe.2665

ISSN

00988847

E-ISSN

10969845

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