Under the California Building Code, when is special inspection required for structural steel welding in seismic design categories D, E, and F?
Correct Answer
D) For welds in seismic force-resisting systems and diaphragm connections
CBC Section 1705.2.2 requires special inspection for structural steel welding in seismic force-resisting systems and diaphragm connections in seismic design categories D, E, and F. This ensures critical seismic connections meet California's stringent requirements for earthquake resistance.
Why This Is the Correct Answer
CBC Section 1705.2.2 targets special inspection requirements at the most critical structural connections in high-seismic zones: welds that are part of the seismic force-resisting system (such as moment frames and shear walls) and diaphragm connections (which transfer lateral seismic loads between floors and the lateral system). These connections must perform reliably in an earthquake, so third-party special inspection is required to verify weld quality beyond normal contractor self-inspection.
Why the Other Options Are Wrong
Option A: For all structural steel welding regardless of location
Requiring special inspection for ALL structural steel welding regardless of location would be overly broad and is not what the CBC mandates. Many structural welds in non-seismic-force-resisting applications are inspected through normal quality control processes. The CBC focuses special inspection resources on the most critical seismic connections.
Option B: Only for welds in moment-resisting frame connections
Limiting special inspection to only moment-resisting frame connections is too narrow. While moment frame welds do require special inspection, the CBC also requires it for diaphragm connections and other welds in the seismic force-resisting system. Excluding diaphragm connections would leave critical load-transfer welds uninspected.
Option C: Only for welds exceeding 1/4 inch fillet size
Fillet weld size (1/4 inch threshold) is not the criterion for triggering special inspection requirements in seismic design categories D, E, and F. The determining factor is whether the weld is part of the seismic force-resisting system or a diaphragm connection — not the physical size of the weld.
Memory Technique
Remember 'SFRS + Diaphragm = Special Inspection': in seismic categories D/E/F, special inspection is required for the Seismic Force-Resisting System welds AND diaphragm connection welds. These two systems together form the complete earthquake resistance path — both get third-party oversight.
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