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FEMA/ASCE prestandard

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On the issue of overturning stability, you have opened a big can of 
worms. All those who still live in past glories have to stop and ponder 
how California managed so well except by the grace of God.

Most taller buildings would have larger participation from the higher 
mode shapes of which would reduce the net overturning due to sway 
reversals. However, it is not unthinkable to have Kobe type or Mexico 
City destructions when the ground motions are appropriately applied. 

John Hall of Caltech, and Paul Summerfield  from Pasadena did more than 
suggest  that a near fault event will wipe out some of the long period 
structures like high rises (and falls).

Sincerely,
David Choi
11-25-98

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