According to the California Building Code (CBC), what is the minimum lap splice length for #4 rebar in a concrete foundation wall in normal weight concrete with f'c = 3000 psi?
Correct Answer
B) 18 inches
Per CBC Section 1909.7.2.1, the minimum lap splice length for #4 rebar in normal weight concrete with f'c = 3000 psi is 18 inches. This is calculated using the development length formula and splice requirements specific to California seismic conditions.
Why This Is the Correct Answer
According to CBC Section 1909.7.2.1, the minimum lap splice length for #4 rebar in normal weight concrete with f'c = 3000 psi is 18 inches. This requirement accounts for proper load transfer between reinforcing bars in foundation walls and ensures structural integrity under seismic conditions. The 18-inch minimum is specifically calculated based on the development length formula for #4 bars in 3000 psi concrete, considering California's seismic design requirements.
Why the Other Options Are Wrong
Option A: 12 inches
15 inches falls short of the CBC requirement for #4 rebar lap splices in 3000 psi concrete. While closer to the correct length, this dimension would not meet the calculated development length requirements for proper reinforcement continuity in foundation walls.
Option C: 24 inches
24 inches exceeds the minimum requirement for #4 rebar in 3000 psi concrete. While this length would be structurally adequate, it represents unnecessary material usage and cost. The CBC specifies 18 inches as sufficient for proper load transfer and structural performance.
Memory Technique
Remember '#4 at 3000 = 18' - the rebar size (#4) plus concrete strength (3000 psi) equals 18 inches for lap splice length in California foundations.
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