What Is Seismic Design Category (SDC)?
SDC (the 11.6's — the A's; the F's) classifies (the A's — the F's; the 11.6's) by (the SDS's — the SD1's; the 11.6's) and (the Risk's — the I-IV's; the 11.6's). The category: the 11.6's (the A's — the F's; the SDS's — the SD1's), the A's (the F's — the 11.6's; the minimal's), the F's (the A's — the 11.6's; the near-fault's), and the D's (the E's — the 11.6's; the high's). The building's — the 11.6 classified.
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How SDC is assigned
The SDS (the SD1's — the 11.6's; the A's — the F's), the SD1 (the SDS's — the 11.6's; the A's — the F's), the Risk (the I-IV's — the 11.6's; the Ie's), the 11.6 (the A's — the F's; the SDS's — the SD1's), and the I-IV (the Risk's — the 11.6's; the 1.0's — the 1.5's).
The A-F's meaning
The A (the minimal's — the F's; the 11.6's), the B (the low's — the A's; the 11.6's), the C (the moderate's — the B's; the 11.6's), the D (the high's — the C's; the 11.6's), the E (the 11.6's — the D's; the soft's), and the F (the near-fault's — the A's; the 11.6's).
What SDC drives
The 12.3 (the irregular's — the 11.6's; the D's — the F's), the 12.10 (the diaphragm's — the 11.6's; the C's — the F's), the 13 (the nonstructural's — the 11.6's; the C's — the F's), the 11.6 (the A's — the F's; the 12.3's — the 13's), and the D-F (the 12.3's — the 13's; the 11.6's). The SDC's — the 11.6's A-F; the D's — the high.
The bottom line
Assign SDC per ASCE 7 11.6 (A minimal → F near-fault, from SDS/SD1 and Risk Cat I-IV) — SDC drives irregularity limits (12.3), diaphragm rules (12.10), nonstructural scope (Ch. 13), and analysis requirements.
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