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 SECTION 4.
STEEL STRUCTURES
1.
SCOPE AND RELATED CRITERIA.
a. Scope. Criteria and data resulting from experience which will
assist the Engineer in achieving cost-effective design of steel structures
are presented in this section.
b. Related Criteria. The provisions for inelastic blast resistant
design of steel elements and structures are consistent with conventional
static plastic design procedures as presented in the AISC Specification for
the Design, Fabrication and Erection of Structural Steel for Buildings, and
are modified as required to account for blast loading resulting from high
explosive detonations. The bulk of the information provided in this section
was obtained from the report by Healey, et al., Design of Steel Structures
to Resist the Effects of HE Explosions. The deformation criteria for both
hot-rolled and cold-formed structural elements are summarized below:
(1) Beam elements including purlins, spandrels, and girts.
(a) Reusable structures.
[theta]max = 1[deg.] or [mu]max = 3, whichever governs
(b)
Non-reusable structures.
[theta]max = 2[deg.] or [mu]max = 6, whichever governs
(2) Frame structures.
(a) Reusable structures.
For sidesway, maximum [delta]/H = 1/50
For individual frame members, [theta]max = 1[deg.]
Note:
For Fy = 36 ksi, [theta]max should be reduced
according to the following relationship for L/d less than
13.
[theta]max = 0.07 L/d + 0.09
For higher yield strength, [theta]max = 1[deg.] governs
over the practical range of L/d values.
(b) Non-reusable structures.
For sidesway, maximum [delta]/H = 1/25
For individual frame members, [theta]max = 2[deg.]
2.08-129
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