Structural
Domain focus
Structural tests loads, load combinations, risk categories, seismic design, foundations, and special inspections. The exam focuses on the building official's role: verifying that the design basis is stated, that special inspections are identified, and that structural observations are required where triggered.
Core rules
- Chapter 16 establishes load combinations, dead, live, wind, snow, seismic, and flood loads; Table 1604.5 assigns risk categories I through IV.
- Seismic design category depends on occupancy risk and site hazards; SDC D, E, or F triggers stricter detailing.
- Chapter 17 requires a statement of special inspections and identifies inspections for concrete, masonry, steel, wood, soils, and seismic systems.
- Chapter 18 covers soils and foundations; geotechnical reports support bearing capacity and site class.
- Structural observations under §1704.6 are required for certain high-risk structures and are not the same as special inspections.
- Alternate materials and methods under §104.11 require equivalent performance.
Worked example
A new 6-story office building is assigned Risk Category II and SDC D. The structural plans show a steel special moment frame but no statement of special inspections. Under §1704.2, the permit set must include a statement of special inspections prepared by the registered design professional. The building official should withhold structural approval until the statement identifies welding, high-strength bolting, and frame inspections. A general note that all work is subject to inspection does not satisfy the requirement.
Traps
Do not treat special inspections as the same as building inspections. Do not miss the statement of special inspections. Do not accept a design without load combinations. Do not confuse allowable stress design with strength design. Do not ignore geotechnical report recommendations.