To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: NEHRP earthquake loading
From: Paul Crocker <paulc(--nospam--at)ckcps.com>
Date: Thu, 4 May 2000 18:32:27 +0100
In the '97 NEHRP, seismic design is based on 2/3 of the 2,500 return period
earthquake (2,500 year return period = 2% probability of exceedance in 50
years). Does anyone know what rationale is used to justify the 2/3? I have
read through the commentary, and can't seem to find anything about the 2/3.
I assume either it was an arbitrary decision about the design level to work
toward, or there is something specific about it that I am missing.