According to CBC requirements for retaining walls in California, what additional design consideration must be addressed for retaining walls over 4 feet in height located in seismic design categories D, E, and F?
Correct Answer
A) Seismic earth pressure increment and dynamic analysis
CBC Section 1803.5.12 requires that retaining walls over 4 feet high in seismic design categories D, E, and F must account for seismic earth pressure increments and may require dynamic analysis. This addresses California's unique seismic conditions and ensures retaining wall stability during earthquake events.
Why This Is the Correct Answer
CBC Section 1803.5.12 specifically requires retaining walls over 4 feet in height located in seismic design categories D, E, and F to account for seismic earth pressure increments. This additional lateral force consideration is critical in high seismic zones like California. Dynamic analysis may also be required depending on the specific conditions and wall height to ensure the structure can withstand earthquake-induced forces beyond static earth pressure.
Why the Other Options Are Wrong
Option B: Increased concrete strength to 4000 psi minimum
While concrete strength is important for retaining walls, the CBC does not mandate a specific 4000 psi minimum for retaining walls in high seismic zones. Concrete strength requirements are determined by structural design loads and exposure conditions, not specifically by seismic design category. The primary seismic consideration is the additional earth pressure forces, not concrete strength.
Option C: Special inspection by a certified geotechnical engineer
Special inspection by a certified geotechnical engineer is not the specific CBC requirement for retaining walls over 4 feet in high seismic zones. While geotechnical input is valuable for retaining wall design, the code specifically addresses the need to account for seismic earth pressure increments in the structural analysis, not inspection requirements.
Option D: Double the standard reinforcement ratio
Doubling the standard reinforcement ratio is not a CBC requirement for retaining walls in high seismic zones. Reinforcement is determined through proper structural analysis that includes seismic earth pressure increments. The code requires accounting for additional seismic forces in the design process, not arbitrary increases to reinforcement ratios.
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