California State University Northridge  College  of  Engineering  &  Computer  Science  *  Department  of  Civil  &  Manufacturing  Engineering

Welcome  to  the   HOT TOPIC   in  Earthquake  Engineering  # 2-b4 !

Performance  Summary  of  Base  Isolated  Rockwell  Intl. Office Building  at  the  1994

Predicted Performance for a 2476-year return period earthquake with  PGA=0.5g, MMI=IX, longitudinal direction

Recorded Performance in longitudinal direction with PGA=0.08g at basement and MMI=VI-VI at the building site

Fixed-base building (design)

Base-isolated building  (design)

SDOF fixed-base model, 5% damping

Real base-isolated building

Predicted  MiF = 9.04

Recorded  MiF = 0.55

RESUME:  Rockwell Office building, in sense of average peak accelerations, performed 45%    worse than its non-isolated hypothetical counterpart. Though the shaking intensity at the building    site was only  MMI = V - VI,  the structural accelerations were close to those predicted for the   postulated MMI = IX + event, while the mitigation factor MiF was 9.04 / 0.55 = 17.1 times smaller.

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This page was last updated on 8/16/99