Civil Engineering Association

COMPARATIVE RESPONSE OF MID-RISE BASE-ISOLATED AND CONVENTIONAL STEEL MOMENT RESISTING FRAME BUILDINGS

Base isolation systems are preferably applied in low-rise buildings since the
vibration period of the structure can be shorter, so that it performs more rigidly to
maximize the benefit from the isolation system. Mid-rise and high-rise base-isolated
buildings are expected to have different and variable response characteristics compared to
low-rise base-isolated buildings, and may not perform as well as low-rise or relatively
stiffer base-isolated buildings. However, in this study, the benefit of seismic isolation in a
9-story is comparable or even better than a low-rise (3-story) isolated building that was
investigated thoroughly in a previous study (Sayani et al. 2011) with respect to peak floor
acceleration, peak story drifts, and peak plastic rotation.
A pair of 9-story isolated and conventional buildings were designed by
Forell/Elsesser, using the same design philosophy as 3-story buildings that were
investigated earlier. Both 9-story and 3-story buildings were designed to satisfactorily
meet the current building code standards (ASCE 2005). OpenSees and SAP 2000 were
used to develop analytical models of the 9-story buildings for independent purposes. The
SAP model was used primarily for model analysis and to perform a design check with
standard response spectrum analysis procedures. The OpenSees model was used for
nonlinear pushover analysis and nonlinear response history analysis to suites of ground
motions representing various probability of occurrence events.

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