When is special inspection required for reinforced concrete construction under the California Building Code?
Correct Answer
C) For all structures in Seismic Design Category C and higher
CBC Section 1705.3 mandates special inspection for reinforced concrete construction in structures assigned to Seismic Design Category C, D, E, or F. Given California's high seismicity, most areas fall into these categories, making special inspection a common requirement to ensure proper construction quality and seismic performance.
Why This Is the Correct Answer
CBC Section 1705.3 mandates special inspection for reinforced concrete in structures assigned to Seismic Design Category C, D, E, or F. Because virtually all of California falls into these higher SDCs, special inspection for reinforced concrete is effectively required statewide. The purpose is to verify concrete mix, placement, consolidation, and rebar installation meet design specifications.
Why the Other Options Are Wrong
Option A: Only when specified by the structural engineer
Waiting for the structural engineer to specify inspection leaves a compliance gap. The CBC imposes mandatory special inspection requirements independent of whether the EOR includes it in the contract documents. Relying solely on engineer specification would allow non-compliant structures in high-seismic zones.
Option B: Only for structures over 3 stories in height
A 3-story height threshold has no basis in CBC Section 1705.3. Special inspection triggers are tied to Seismic Design Category, not building height. A single-story reinforced concrete structure in SDC D requires special inspection.
Option D: For structures assigned to Risk Category III and IV only
Risk Category III and IV alone would exclude the vast majority of California buildings (which are Risk Category II) from special inspection requirements — an outcome contrary to the CBC's intent for high-seismic areas. SDC, not risk category alone, is the triggering criterion in Section 1705.3.
Memory Technique
SDC C and above = Special inspection for Concrete. 'C kicks in at C' — once you hit Seismic Design Category C, special inspection for reinforced concrete is required no matter what.
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