top_ht1.jpg (2496 bytes)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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Our address is: CME, 18111 Nordhoff Street, Northridge, California 91330-8347
   This page was last updated on 8/16/99