In Hawaii's seismic zone, what is the required minimum concrete strength for structural elements in residential construction?
Correct Answer
B) 3,000 psi
Hawaii building code requires minimum 3,000 psi concrete strength for structural elements to ensure adequate performance under seismic loading conditions.
Why This Is the Correct Answer
3,000 psi is the minimum concrete compressive strength required for structural elements in Hawaii's seismic zone residential construction. This threshold ensures that concrete elements can withstand the cyclic loading imposed by earthquake ground motion without brittle failure, providing the ductility and strength necessary for seismic performance.
Why the Other Options Are Wrong
Option A: 3,500 psi
3,500 psi exceeds the minimum requirement. While using higher-strength concrete is permissible and often beneficial, 3,500 psi is not the code-specified minimum for residential structural elements in Hawaii's seismic zone.
Option C: 2,500 psi
2,500 psi falls below the minimum required strength. This lower strength concrete would not provide adequate seismic resistance and is not permitted for structural elements in Hawaii's seismic zone applications.
Option D: 4,000 psi
4,000 psi is well above the minimum requirement. This strength level is typical for commercial or special structural applications but is not the baseline minimum for residential seismic zone construction.
Memory Technique
Remember '3,000 psi — the three-thousand threshold for seismic.' Three zeros for zero earthquake failures. The minimum is 3,000, not 2,500 (too weak) and not 3,500 or 4,000 (commercial-level overkill for residential).
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