Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

TI-809-04 Spectral Ordinates.

[Subject Prev][Subject Next][Thread Prev][Thread Next]
The question by Nicole Stoudt was adequately answered by M Valley.

For Saudi Arabia cities, I found that TI-809-04 is erroneous. For some of
the cities, UBC Zone classification in previous TI was incorrect. TI -809-04
has mathematically converted the old seismic zone coefficient (0.1, 0.15,
0.2 etc) into Spectral Ordinates. Per TI-809-04, for all previous Zone 1,
irrespective of location, Ss is 0.31 and S1 is 0.14.

The actual outdated Aa and Av for DC may be smaller. FEMA  Maps reflect the
actual Spectral Ordinates.

The seismic specialist responsible for TI  is Wright, Thomas D NWK at
Thomas.D.Wright(--nospam--at) . He has responded to my inquiries and
also copied to Bruce.H.McCracken(--nospam--at) He should be able to
provide more clarifications

Eqbal Kassam