What is the minimum required embedment depth for holdown anchors in concrete foundations for wood-frame shear walls in California?
Correct Answer
D) 7 inches
CBC Section 2308.3.4 and the referenced standards typically require a minimum 7-inch embedment for holdown anchors in concrete. This requirement ensures adequate anchorage capacity to resist the uplift forces generated in wood-frame shear walls during seismic events, which is critical in California's seismic environment.
Why This Is the Correct Answer
CBC Section 2308.3.4 and referenced anchor standards (such as ACI 318 Appendix D provisions adopted by the CBC) require a minimum 7-inch embedment depth for holdown anchors in concrete. This depth ensures that the anchor can develop the full uplift resistance needed to keep shear wall end posts from separating from the foundation during seismic events.
Why the Other Options Are Wrong
Option A: 10 inches
10 inches exceeds the minimum requirement. While deeper embedment provides more capacity, the code minimum is 7 inches. Specifying 10 inches as a minimum would unnecessarily increase construction cost.
Option B: 8 inches
8 inches is greater than the 7-inch minimum. This value may be confused with other anchor embedment requirements or common contractor practice, but it is not the code-specified minimum.
Option C: 6 inches
6 inches is less than the 7-inch minimum. An anchor embedded only 6 inches may not develop adequate pullout resistance to resist the uplift forces generated in shear walls during a California seismic event.
Memory Technique
7-inch holdown = 'Lucky 7 holds it down.' The holdown anchor needs a LUCKY SEVEN inches to grip the concrete and keep the shear wall from lifting off.
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