For certain Performance Objectives in the subject document, such as 2A (Safe
Egress for Special Occupancy, Table 4-6) , and 3B (Immediate Occupancy for
Essential Facility, Table 4-7) look like FEMA 273, Linear Static Procedures
and FEMA 273, Nonlinear Static Procedures, respectively.
Before you get too involved using these FEMA 273, Linear Static and Nonlinear
Static Procedures, I recommend that you obtain FEMA 343, "Case Studies: An
Assessment of the NEHRP Guidelines for the Seismic Rehabilitation of
Buildings" which is a BSSC Case Studies Report that reports on the
application of FEMA 273 Guidelines to over forty case study existing
buildings. (Call FEMA Publications at 1-800-480-2520 for your free copy.)
This excellent report was written by Andrew Merovich, Project Technical
Advisory, who worked for John Blume many years ago and managed this BSSC Case
To get you started in reading FEMA 343, turn to page 89, Section 6.2,
Technical Adequacy, Item T1, which discusses the serious problems how FEMA
273 attempts to address the issues related to overturning using the FEMA 273
Linear Static Procedure.
I was a Peer Review working with three consulting structural engineer firms
in the San Francisco Bay Area that were three of the forty Design Firms that
applied FEMA 273 and developed FEMA 273, Linear Static and Nonlinear Static
evaluation analyses and rehabilitation designs as well as prevailing practice
(1994 UBC seismic provisions, etc.) evaluation analyses and rehabilitation
designs to the existing buildings assigned them. They prepared structural
seismic calculations, schematic rehabilitation designs good enough for 35%
progress cost estimates, and definitive reports that included the structural
design costs and construction costs for the FEMA 273 Linear Static and
Nonlinear Static procedures as well as for prevailing practice. These design
and construction cost comparisons are very interesting to get a "first order"
handle on the relative design and constructions costs for these three
FEMA 343 will tell you where the bodies are buried.
Frank E. McClure January 28, 2000
Telephone: 1-925-254-8231 Fax: 1-925-254-4602