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 6.8.3.4 Steel Design: As a minimum, all new steel design for seismic rehabilitation shall
comply with section 8.4 (Seismic Design Categories D, E and F) of FEMA 302.
Member design shall be based on the requirements in Part 1 of the AISC publication
"Seismic Provisions for Structural Steel Buildings" dated April 15, 1997.
a. Design using "Special Moment Frames" (SMF) requirements- chapter 9,
"Intermediate Moment Frames" (IMF) requirements chapter 10, "Ordinary Moment
Frames" (OMF) requirements chapter 11, "Special Truss Moment Frames"
(STMF) requirements chapter 12 of the "AISC seismic Provisions" or
modifications to existing moment frames will not be permitted without advance
written approval from Code 04CN.EH, Southwest Division.
b. Design of concentrically braced frames shall comply with chapter 13
"Special Concentrically Braced Frames" (SCBF) of the "AISC Seismic
Provisions." Attention is called to section 13.3c and commentary section C13.3c for
the 2t set back exception when critical buckling is out of plane of the gusset plate.
Attention is also called to section 13.4a.3 for the post buckling unbalanced vertical
load on the beam.
c. Design using "Eccentrically Braced Frames" (EBF) requirements chapter 15
of the "AISC Seismic Provisions" are permitted unconditionally unless the
design involves link-to-column connections. In accord with section 15.4a, link-
to-column moment connections require tests that demonstrate inelastic rotation
capability and therefore must be approved in writing by Code 04CN.EH,
Southwest Division.
6.8.3.5 Concrete Design: As a minimum, all new concrete design for seismic
rehabilitation shall comply with section 9.7 (Seismic Design Categories D, E or F) of
FEMA 302. The exceptions to section 9.7.3 shall be excluded. Reinforced Concrete
Structural Systems Composed of Interconnected Precast elements Appendix to chapter
9 of FEMA 302, will not be permitted without written approval from Code 04CN.EH,
Southwest Division.
6.8.3.6 Composite Steel and Concrete Structural Design Requirements New design for
seismic rehabilitation per chapter 10 of FEMA 302 and Part II of the "AISC Seismic
Provisions", will not be permitted without written approval from Code 04CN.EH, Southwest
Division.
6.8.3.7 Concrete Masonry Design: As a minimum, all new concrete masonry designs
intended for seismic rehabilitation shall comply with section 11.3.9 (Seismic Design
Categories D, E and F) and section 11.11.5 (Special Reinforced Masonry Shear Walls) of
FEMA 302. Stack Bond Construction per section 11.3.9.3 of FEMA 302, will not be
permitted for structural walls without written approval from Code 04CN.EH, Southwest
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