In California seismic design category E, what special inspection requirement applies to the placement of reinforcing steel in structural concrete elements?
Correct Answer
A) Continuous inspection by a qualified special inspector during all concrete placement
CBC Section 1705.3 mandates continuous special inspection during placement of reinforcing steel and concrete for structural elements in seismic design category E. This heightened inspection requirement in high seismic zones ensures critical structural elements meet stringent quality standards necessary for earthquake resistance.
Why This Is the Correct Answer
CBC Section 1705.3 mandates continuous special inspection during placement of reinforcing steel and concrete for structural elements in seismic design category E. Continuous inspection means the special inspector is present at all times during the critical operation, ensuring every pour meets seismic quality requirements.
Why the Other Options Are Wrong
Option B: Inspection only required for post-tensioned elements
Post-tensioned elements do have special inspection requirements, but SDC E requires continuous inspection for all structural concrete placement — not just post-tensioned elements. Limiting inspection to post-tensioned work would miss the broader requirement.
Option C: Periodic inspection by the contractor's quality control inspector
Periodic inspection by the contractor's quality control inspector is not sufficient for SDC E. A third-party qualified special inspector (not the contractor's own QC staff) must provide continuous oversight. The contractor cannot self-inspect for this requirement.
Option D: Daily inspection reports filed with the building department
Daily inspection reports filed with the building department describe a reporting mechanism, not an inspection method. Continuous special inspection by a qualified inspector — not merely filing daily reports — is required under CBC 1705.3.
Memory Technique
SDC E = Extreme seismic = Every moment counts = Continuous inspection. The higher the seismic category letter, the more continuous the required oversight.
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