When designing shear walls in California, which of the following best describes the load path requirement for lateral forces?
Correct Answer
A) Lateral forces must transfer from diaphragm to foundation through continuous structural elements
CBC Section 2301.2.2.1 requires a complete and continuous load path from point of lateral force application through the diaphragm to shear walls and down to the foundation. This continuous load path is critical for seismic resistance in California's high seismic environment.
Why This Is the Correct Answer
Option A is correct. CBC Section 2301.2.2.1 requires that lateral forces follow a complete and continuous load path from the point of application (wind or seismic force at roof or floor levels) through the horizontal diaphragm, into shear walls, and down to the foundation. Every element in this chain must be properly connected and capable of transferring the required forces.
Why the Other Options Are Wrong
Option B: Lateral forces only need to reach the first floor level
Option B ('Lateral forces only need to reach the first floor level') is incorrect. Lateral forces must be transferred all the way to the foundation, not merely to the first floor. Stopping at the first floor leaves the foundation unanchored to the lateral force system, which would allow the entire structure to translate or overturn during seismic events.
Option C: Load path requirements only apply to buildings over 3 stories
Option C ('Load path requirements only apply to buildings over 3 stories') is incorrect. There is no such exception in the CBC. The continuous load path requirement applies to all structures subject to lateral forces, regardless of height. Even single-story residences must have a complete lateral load path to the foundation.
Option D: Lateral forces can be distributed through non-structural elements
Option D ('Lateral forces can be distributed through non-structural elements') is incorrect. Non-structural elements (drywall, finish materials, partition walls not designed as shear walls) cannot be counted in the lateral load path. Relying on non-structural elements for seismic resistance is a major code violation and a leading cause of earthquake damage.
Memory Technique
Visualize the lateral load path as a chain: Roof/Floor Diaphragm → Collectors → Shear Walls → Hold-downs → Foundation. Every link must be continuous and strong. A chain is only as strong as its weakest link — a single missing connection breaks the entire lateral force path.
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