What Is a Seismic Design Category D Requirement?
SDC D (the high seismic — the SDS/SD1's thresholds) triggers the strict requirements: the permitted systems (the detailed — the special/intermediate; the height's — the limits), the irregularity (the prohibitions — the triggers'), and the detailing (the special — the ductile). The requirement: the SDC's — the risk's; the D's — the high's. The seismic's — the strict tier.
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What triggers SDC D
The spectral (the SDS ≥0.50g or the SD1 ≥0.20g — the thresholds; the Site Class' — the amplification), the occupancy (the III/IV's — the lower; the Ie's), and the determination (the ASCE 7 11.6 — the tables'; the geotechnical's — the Site Class).
The D requirements
The systems (the special/intermediate — the permitted; the ordinary's — the prohibited/heights), the irregularities (the triggers — the analysis'; the prohibitions — the extreme), the detailing (the special — the ductile; the connections'), and the components (the anchorage — the seismic; the Fp's).
Design and construction
The analysis (the ELF's — the permitted; the modal's — the irregular), the peer (the review's — the threshold's), the inspection (the special — the required; the structural's), and the geotechnical (the investigation's — the hazard's; the liquefaction's). The SDC D is the high — the ductility designed, the irregularity restrained.
The bottom line
SDC D (SDS ≥0.50g or SD1 ≥0.20g) requires special/intermediate seismic systems, triggers irregularity limits and special inspection — determine via ASCE 7 11.6 with geotechnical Site Class.
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