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Re: UBC97 STORY DRIFT LIMITATION

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0.005h in UBC 94 is indirect requirement for service limit state(no limts
for ultimate limit in UBC 94) .
0.025h in UBC 97 is for ultimate limit state requirement.(no limits for
service limit in UBC 97)
Service limit state for moderate EQ is more strigent than ultimate limit
since more frequent.
There is no ultimate limit state requirement in UBC 94.
Now, only Japanse building standard law contains service limit state of
0.005h.

I hope this helps you.

S.C.Jeong RE