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RE: Vertical Component of Seismiv Loads in Bridges

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FWIW, that is precisely the "rule of thumb" that I've always heard.

-----Original Message-----
From: marfra(--nospam--at)opus.co.tt [mailto:marfra(--nospam--at)opus.co.tt]
Sent: Monday, April 03, 2000 9:47 PM
To: seaint(--nospam--at)seaint.org
Subject: Vertical Component of Seismiv Loads in Bridges


..One firm with experience in Japan
recommends the use of the acceleration response spectrum for horizontal
motions factored by two thirds. They also recommend directional
combinations for the three possible dominant directions of motion.