International Building Code Section 2205


International Building Code 2205.1

General. The design, fabrication and erection of structural
steel for buildings and structures shall be in accordance
with AISC 360. Where required, the seismic design of steel
structures shall be in accordance with the additional provisions
of Section 2205.2.

International Building Code 2205.2

Seismic requirements for steel structures. The
design of structural steel structures to resist seismic forces shall
be in accordance with the provisions of Section 2205.2.1 or
2205.2.2 for the appropriate seismic design category.

Seismic Design Category A, B or C. Structural
steel structures assigned to Seismic Design Category A, B
or C shall be of any construction permitted in Section 2205.
An R factor as set forth in Section 12.2.1 of ASCE 7 for the
appropriate steel system is permitted where the structure is
designed and detailed in accordance with the provisions of
AISC 341, Part I. Systems not detailed in accordance with
the above shall use the R factor in Section 12.2.1 of ASCE 7
designated for “structural steel systems not specifically
detailed for seismic resistance.”

Seismic Design Category D, E or F. Structural
steel structures assigned to Seismic Design Category D, Eor
F shall be designed and detailed in accordance with AISC
341, Part I.

International Building Code 2205.2.1

Seismic Design Category A, B or C. Structural
steel structures assigned to Seismic Design Category A, B
or C shall be of any construction permitted in Section 2205.
An R factor as set forth in Section 12.2.1 of ASCE 7 for the
appropriate steel system is permitted where the structure is
designed and detailed in accordance with the provisions of
AISC 341, Part I. Systems not detailed in accordance with
the above shall use the R factor in Section 12.2.1 of ASCE 7
designated for “structural steel systems not specifically
detailed for seismic resistance.”

International Building Code 2205.2.2

Seismic Design Category D, E or F. Structural
steel structures assigned to Seismic Design Category D, Eor
F shall be designed and detailed in accordance with AISC
341, Part I.

International Building Code 2205.3

Seismic requirements for composite construction.
The design, construction and quality of composite steel and
concrete components that resist seismic forces shall conform to
the requirements of the AISC 360 and ACI 318. An R factor as
set forth in Section 12.2.1 of ASCE 7 for the appropriate composite
steel and concrete system is permitted where the structure
is designed and detailed in accordance with the provisions
of AISC 341, Part II. In Seismic Design Category B or above,
the design of such systems shall conform to the requirements of
AISC 341, Part II.

Seismic Design Categories D, E and F. Composite
structures are permitted in Seismic Design CategoriesD,
E and F, subject to the limitations in Section 12.2.1 of ASCE
7, where substantiating evidence is provided to demonstrate
that the proposed system will perform as intended by AISC
341, Part II. The substantiating evidence shall be subject to
building official approval. Where composite elements or
connections are required to sustain inelastic deformations,
the substantiating evidence shall be based on cyclic testing.

International Building Code 2205.3.1

Seismic Design Categories D, E and F. Composite
structures are permitted in Seismic Design CategoriesD,
E and F, subject to the limitations in Section 12.2.1 of ASCE
7, where substantiating evidence is provided to demonstrate
that the proposed system will perform as intended by AISC
341, Part II. The substantiating evidence shall be subject to
building official approval. Where composite elements or
connections are required to sustain inelastic deformations,
the substantiating evidence shall be based on cyclic testing.