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FEMA Tier3 Analysis - Seismic Factor[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: FEMA Tier3 Analysis - Seismic Factor
- From: "Dan Morrow" <dmorrow(--nospam--at)swensonsayfaget.com>
- Date: Mon, 17 Nov 2003 13:24:51 -0800
Perhaps you've gotten an answer or discovered it yourself. The Commentary for FEMA 310 5.2.1 (page 5-2) states that the 0.75 factor "applies to the evaluation of the building only. Any mitigation or rehabilitation as a result of the evaluation must use the full seismic force for design."
Dan Morrow, P.E.
Swenson Say Fagét Structural Engineers
2124 3rd Ave. Suite 100
Seattle, WA 98121
I wanted a clarification on one of the issue mentioned in FEMA 310 which =
is currently the ASCE standard 31-03. =20
Referring to sec5.2.1, it states that 75% of the calculated seismic =
force can be used for a Tier 3 analysis. =20
Q1. Is this only for the evaluation or the retrofit design which =
It suggests that FEMA 356 be used for this evaluation. It says that the =
75% force is taken since the documents (FEMA356) are intended for ="">
Q2. What force level should be considered when upgrading the structure - =
Suppose during evaluation, a few beams (say 10) do not meet the =
suggested criteria and were found 20% overstressed under the 75% seismic =
force level. But while using 100% seismic level for the retrofit, =
several more members might fail? How do you justify this unless you did =
a 100% analysis during the evaluation and reported the cost to the =
Aswin Rangaswamy, P.E.
Jacobs Facilities Inc. (www.jacobs.com )
(714) 503-3772 (P); (714) 503-3865 (F)
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