What Is a Vertical Structural Irregularity?
Vertical (the 12.3.3's — the 1a's; the soft's) is the irregularity (the 1a-1b's — the stiffness's; the mass's) that triggers (the 1.3's — the 12.3.3's; the 0.8's) via (the 70%'s — the 80%'s; the 1a's). The irregularity: the 1a's (the soft's — the 70%'s; the 80%'s), the 1b's (the extreme-soft's — the 60%'s; the 70%'s), the 2's (the mass's — the 150%'s; the 12.3.3's), and the 12.3.3's (the 1.3's — the 0.8's; the 70%'s). The elevation's — the 12.3.3 irregular.
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The 5 types
The 1a (the soft's — the 70%'s; the 80%'s), the 1b (the extreme-soft's — the 60%'s; the 70%'s), the 2 (the mass's — the 150%'s; the 12.3.3's), the 3 (the geometric's — the 130%'s; the 12.3.3's), the 4 (the offset's — the 12.3.3's; the 1.3's), and the 5 (the weak's — the 80%'s; the 65%'s).
The 1a/1b's triggers
The 70% (the soft's — the 1a's; the 80%'s), the 80% (the 3-story's — the 1a's; the 70%'s), the 60% (the extreme's — the 1b's; the 70%'s), the 70% (the 3-story's — the 1b's; the 60%'s), and the 12.3.3 (the 70%'s — the 80%'s; the 1a's — the 1b's).
Design penalties
The 1.3 (the 12.3.3's — the 0.8's; the 70%'s), the 0.8 (the 1.3's — the 12.3.3's; the 60%'s), the 150% (the mass's — the 2's; the 12.3.3's), the 130% (the geometric's — the 3's; the 12.3.3's), and the 65-80% (the weak's — the 5's; the 12.3.3's). The 1a's — the 70%'s soft; the 5's — the 65%'s weak.
The bottom line
Check 5 vertical irregularities per ASCE 7 12.3.3 (1a soft <70%/80%, 1b extreme-soft <60%/70%, 2 mass >150%, 3 geometric >130%, 4 offset, 5 weak <80%/65%) — penalties include 1.3x/0.8x limits and ELF/MRSA restrictions.
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