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

Welcome  to  the HOT TOPIC   in  Earthquake  Engineering  # 2-b1 !

Performance Summary of Base Isolated Los Angeles County    Fire Command and Control Facility at the 1994

Predicted Performance for a 1000-year return   period earthquake with  PGA=0.5g, MMI=IX,   transverse direction

Recorded Performance in transverse direction  with  PGA=0.21g  at basement and  MMI=VII  at the building site

Fixed-base building (design)

Base-isolated building  (design)

SDOF fixed-base model, 5% damping

Real base-isolated building

Predicted  MiF = 7.15

Recorded  MiF = 1.96

RESUME:  In sense of average peak accelerations, the building performed 1.96 times better    than its non-isolated hypothetical counterpart. However, the peak acceleration at this MMI VII    event happened to be 0.25g / 0.13g = 1.92 times larger than that predicted for the postulated     MMI IX event while the mitigation factor MiF happened to be 7.15 / 1.96 = 3.65 times smaller.

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This page was last updated on 8/16/99