When designing a wood-framed structure in California, which seismic design category requires special moment frame construction for buildings over 35 feet in height?
Correct Answer
B) SDC D
Seismic Design Category D requires special moment frame construction for wood buildings exceeding 35 feet in height due to high seismic risk in California.
Why This Is the Correct Answer
Seismic Design Category D (SDC D) is where CBC and ASCE 7 require special moment frame construction for wood-framed buildings exceeding 35 feet in height. SDC D corresponds to areas with high seismic hazard — the majority of California's populated areas fall into this category.
Why the Other Options Are Wrong
Option A: SDC A
SDC A is the lowest seismic hazard category, typically found in areas with minimal earthquake risk. Buildings in SDC A have very relaxed structural requirements and do not require special moment frames.
Option C: SDC C
SDC C represents moderate seismic hazard. While some enhanced requirements apply in SDC C, special moment frame construction for wood buildings over 35 feet is not triggered until SDC D.
Option D: SDC B
SDC B represents low-to-moderate seismic hazard with minimal structural upgrade requirements. Special moment frames are not required in SDC B.
Memory Technique
Think 'D for Demanding' — SDC D is where demands get serious. Special moment frames, specific wall heights, and enhanced connections all kick in at SDC D. In California, if a question involves a high-rise or taller wood structure, SDC D is almost always the answer.
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