What Is a Horizontal Structural Irregularity?
Horizontal (the 12.3.3's — the plan's; the 1a's) is the irregularity (the 1a-1b's — the torsion's; the reentrant) that triggers (the 25%'s — the 12.3.3's; the amplified) via (the 1.2's — the 1.4's; the Ax's). The irregularity: the 1a's (the torsion's — the 1.2's; the 1.4's), the 1b's (the extreme's — the 1.4's; the 12.3.3's), the 2's (the reentrant's — the 15%'s; the 12.3.3's), and the 12.3.3's (the 25%'s — the amplified; the 1.2's). The plan's — the 12.3.3 irregular.
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The 5 types
The 1a (the torsion's — the 1.2's; the 12.3.3's), the 1b (the extreme's — the 1.4's; the 12.3.3's), the 2 (the reentrant's — the 15%'s; the 12.3.3's), the 3 (the diaphragm's — the 50%'s; the 12.3.3's), the 4 (the offset's — the 12.3.3's; the 1.4's), and the 5 (the nonparallel's — the 12.3.3's; the 1.0's).
The 1a/1b's triggers
The 1.2 (the torsion's — the 1a's; the 12.3.3's), the 1.4 (the extreme's — the 1b's; the 12.3.3's), the Ax (the 1.0-3.0's — the 1.2's; the 1.4's), the 25% (the 12.3.3's — the amplified's; the 1.2's), and the 12.3.3 (the 25%'s — the 1.4's; the 1.2's).
Design penalties
The 25% (the 12.3.3's — the 1.2's; the 1.4's), the Ax (the 3.0's — the 1.0's; the 1.2's — the 1.4's), the 15% (the reentrant's — the 2's; the 12.3.3's), the 50% (the diaphragm's — the 3's; the 12.3.3's), and the 1.2 (the 1.4's — the 1a's; the 1b's). The 1a's — the 1.2's torsion; the 1b's — the 1.4's extreme.
The bottom line
Check 5 horizontal irregularities per ASCE 7 12.3.3 (1a torsion >1.2, 1b extreme >1.4, 2 reentrant >15%, 3 diaphragm >50%, 4 offset, 5 nonparallel) — 1a/1b trigger Ax 1.0-3.0 and 25% force amplification.
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