Changes introduced in AISC 341-16 (Seismic AISC 341)
Design is available to AISC 341-05, AISC 341-10, AISC 341-16 and AISC 341-22. The changes between the 10 and 16 versions, as implemented in Tekla Structural Designer are listed below.
Beam Stability Bracing - maximum spacing (D1.2a. and D1.2b.)
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For moderately ductile beams:
Lpd = 0.19 x ry x E/(Ry x Fy)
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For highly ductile beams:
Lpd = 0.095 x ry x E/(Ry x Fy)
Column required strength (D1.4a) (applies to all SFRS)
- Only for ‘overstrength seismic load’
- Previously called ‘amplified seismic load’
- Capacity analysis’ now omitted
OCBF and V&A braces (F1.4a)
- Tension yield strength/amplified seismic + post buckling strength has been replaced by overstrength seismic load + post buckling strength
OCBF and beam design (F1.5c)
- New requirement, beams in SFRS are now designed for overstrength seismic load
SMF Moment ratio (E3.4a) - strong column weak beam
- Enhanced plastic moment capacity of beams 1.1 Ry Fy Z has
been replaced by maximum probable moment, Cpr/αs Ry
Fy Z
Cpr from AISC 358-16