“It is recognized that when the designer has the option to design a building
to meet the AISC Specification with R=3, such a design will generally be more
cost effective than the same structure designed in accordance with the AISC
Seismic Provisions using a higher value of R.
The extra fabrication, erection
and inspection costs needed to achieve the high ductility commensurate
with the higher R more than offset the additional steel tonnage required by
the R=3 system.”
-AISC Seismic Design Manual, 2nd Edition
Ductility
“If the Seismic Provisions are required because of building type or usage,
system choice, or because of owner preference, all parties should be aware
of the cost involved. The requirements of the Seismic Provisions have been
known to increase the structural steel cost by 30 to 40%.”
- AISC Design Guide 29: Vertical Bracing Connections – Analysis and Design.
Building:
“Any structure whose intended use includes shelter of human occupants.”
Nonbuilding Structure:
“A structure, other than a building, constructed of a type included in Chapter 15
and within the limits of Section 15.1.1.”
Nonbuilding Structure Similar to a Building:
“A nonbuilding structure that is designed and constructed in a manner similar to
buildings, will respond to strong ground motion in a fashion similar to buildings,
and has a basic lateral and vertical seismic force-resisting system conforming to one
of the types indicated in Tables 12.2-1 or 15.4-1.”
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