Structural Design and Load Requirements
Load Types
Structural design addresses dead loads (permanent construction), live loads (occupants, furniture, movable equipment), environmental loads (snow, wind, seismic, rain), and special loads (impact, concentrated). Candidates must know that live loads vary by occupancy - assembly and storage areas carry higher loads than residential - and that load combinations are used to design for simultaneous effects.
Structural Safety Concepts
Key concepts include allowable stress versus limit states design, deflection limits, continuity and load paths, and the role of lateral bracing. The exam also tests whether a structural alteration triggers a re-evaluation of the entire structure - generally, altering a structural element requires demonstrating that the altered structure and its load path remain adequate. Traps include confusing dead and live load, or assuming snow load is irrelevant in mild climates (it may still be required by the referenced standard).
Worked Example / Rule of Thumb
Rule of thumb: classify every load in the stem before doing anything else. A heavy partition is dead load; a crowd is live load; a rooftop snow drift is environmental. If the question asks whether a change is acceptable, check the load path from the point of change to the foundation - if the path is interrupted or overloaded, the change is not acceptable without reinforcement.
Exam Strategy
Structural questions on a building-code exam are usually conceptual, not computational. Focus on load classification and load-path continuity rather than numbers.