Page 12 - Modern Steel Construction (April 2019)

This month’s Steel Quiz focuses on seismic design. The answers can all
steel be found in the 2016 AISC Seismic Provisions for Structural Steel Buildings

quiz
(ANSI/AISC 341, available at www.aisc.org/speci cations).

1 True or False: If a fabricator notifies the c. Welds joining box section elements 4 True or False: Seismic drift limits,
engineer of record (EOR) that ASTM d. Beam flange and web CJP welds which are commonly used to ensure
A709 is readily available for hot-rolled to columns the serviceability of a structure, are
sections used in the seismic force- 3 For the square, moderately ductile regarded as a matter of judgement
resisting system (SFRS) for a project encased composite column shown rather than absolute design limits.
where the requirements in the AISC in Figure 1, what is the maximum 5 Buckling-restrained braced
Seismic Provisions need to be met, spacing of transverse reinforcement
this is acceptable so long as the EOR at the top and bottom? frames (BRBFs) provide significant
inelastic deformation capacity
fully evaluates the suitability based
W14x132
on strength properties, ductility, W14×132 #3 through yielding and shall be
designed, tested and detailed
#3 TIE BARS
formability, soundness, weldability, TIE
notch toughness and corrosivity, BARS to accommodate at least what
expected deformation?
among other considerations.
6 True or False. K-braced frames are
2 Which of the following are not listed allowed to be used as an SFRS so long
in the Seismic Provisions as special
moment frame (SMF) demand-critical #8 as the additional brace post-buckling
BARS
forces are accounted for through
#8 BARS (TYP.)
welds? (TYP.)
a. Column-to-base plate connections inelasticity similar to the link in an
eccentrically braced frame (EBF).
b. Column splice groove welds
1'-10"
1’-10“ TURN TO PAGE 14 FOR THE ANSWERS

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12 | APRIL 2019