A reinforced concrete beam requires #8 rebar with a development length of 48 inches. Due to space constraints, you can only provide 36 inches of straight development length. What is an acceptable solution per CBC?
Correct Answer
A) Provide a 90-degree hook with additional embedment
When adequate straight development length cannot be provided, a 90-degree hook with proper additional embedment length can be used to achieve the required development per CBC provisions.
Why This Is the Correct Answer
When straight development length cannot be achieved, ACI 318 (adopted by CBC) permits the use of standard hooks to reduce the required development length. A 90-degree hook with the appropriate tail extension (ldh) provides the necessary anchorage. This is the standard engineering solution for space-constrained anchorage situations.
Why the Other Options Are Wrong
Option B: Reduce the required development length by 25%
Development length requirements cannot be arbitrarily reduced by a percentage. The required development length is a calculated value based on bar size, concrete strength, cover, and spacing — it cannot be simply cut by 25% without changing one of those parameters.
Option C: Increase concrete strength to 4,000 psi
Increasing concrete strength to 4,000 psi would reduce the required development length somewhat (development length is inversely proportional to the square root of f'c), but this alone cannot reduce a 48-inch requirement to 36 inches without recalculation and may not be sufficient. More importantly, this is not the standard code solution when space is the constraint.
Option D: Use #6 rebar instead
Using #6 rebar instead of #8 changes the structural design — you cannot substitute a smaller bar without redesigning the beam for the different steel area and recalculating capacity. This is a design change, not a constructability solution.
Memory Technique
When space runs short, hook it out. A standard hook 'turns the corner' to gain the missing anchorage length. Think of it as the rebar making a right-angle turn to hold on when it can't go straight far enough.
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