According to CBC Section 1905.2.1, what is the minimum compressive strength required for structural concrete in California buildings located in Seismic Design Category D?
Correct Answer
B) 3,000 psi
CBC Section 1905.2.1 requires a minimum compressive strength of 3,000 psi for structural concrete. This requirement is critical in California's seismic zones to ensure adequate structural performance during earthquake events.
Why This Is the Correct Answer
CBC Section 1905.2.1 requires a minimum compressive strength of 3,000 psi (f'c ≥ 3,000 psi) for structural concrete in buildings assigned to Seismic Design Categories D, E, and F. This elevated minimum (above the general 2,500 psi baseline) ensures adequate ductility and structural performance during seismic events common in California.
Why the Other Options Are Wrong
Option A: 2,500 psi
2,500 psi is the general minimum for non-structural or lower-risk concrete applications. It does not meet the elevated seismic requirements for SDC D. Using 2,500 psi in a seismic zone D structure would violate CBC Section 1905.2.1 and create a life-safety hazard.
Option C: 4,000 psi
4,000 psi exceeds the minimum requirement. While higher-strength concrete is acceptable and often used in practice, 4,000 psi is not the statutory minimum set by CBC 1905.2.1. Choosing 4,000 psi as the 'minimum' overstates the code requirement.
Option D: 5,000 psi
5,000 psi is high-strength concrete well above the minimum requirement. Like 4,000 psi, it may be used in design but is not the code-mandated minimum. This distractor tests whether candidates know the specific code floor versus common engineering practice.
Memory Technique
Seismic Category D = '3,000 psi minimum.' Think: 'D for Danger zone demands 3,000.' The standard 2,500 psi is for lower-risk applications; add 500 psi when you're in seismic danger territory (SDC D and above).
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