In Seismic Design Category E, what is the minimum lap splice length required for #5 reinforcing bars in a concrete shear wall?
Correct Answer
B) 24 inches
In high seismic zones (SDC E), #5 bars require a minimum lap splice of 24 inches to develop adequate tensile strength and ensure structural continuity during seismic events.
Why This Is the Correct Answer
24 inches is the minimum lap splice for #5 bars in SDC E shear walls. High seismic zones demand longer lap splices to develop the full tensile capacity of the bar and maintain structural continuity under cyclic seismic loading. The increased requirement over standard zones accounts for the severe ground motion expected in SDC E.
Why the Other Options Are Wrong
Option A: 18 inches
18 inches is insufficient for SDC E conditions. While it may meet minimum development length in low seismic zones for small bars, the heightened demands of Seismic Design Category E require the additional lap length to prevent bar slip and ensure the shear wall can redistribute forces during an earthquake.
Option C: 30 inches
30 inches exceeds the required minimum for #5 bars in SDC E. Larger bars (#7, #8, and above) or situations requiring Class B splices in extremely high-demand zones might call for this length, but it is not the standard minimum for #5 bars and would impose unnecessary cost.
Option D: 12 inches
12 inches is far too short for any seismic application and does not develop the design strength of a #5 bar in concrete. This length might be referenced in very light non-structural applications but is never acceptable for shear wall reinforcement in any seismic category.
Memory Technique
Think of the alphabet: SDC A–C = lower demands, SDC D–F = higher demands. For SDC E (#5 bars in shear walls), '24 inches = two feet, for safety.' The number 24 matches the 24-hour heightened vigilance of a seismic zone — always on guard, always longer.
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