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Civil Engineering QUESTION #6601
Question 1
For a #3 stirrup or tie bar, the minimum required inside diameter of a standard hook bend is:
  • 1.5 in
  • 2.0 in
  • 2.5 in
  • 3.0 in✔️
Correct Answer Explanation
ACI 318 specifies that for \(\#3\) through \(\#5\) bars, the minimum inside bend diameter for stirrup/tie hooks is \(4d_b\). For \(\#3\) bar, \(d_b = 0.375\,\text{in}\), so minimum inside diameter \(= 4 \times 0.75 = 3\,\text{in}\) (using outside diameter relation — per ACI Table 25.3.2, inside diameter \(= 4d_b = 1.5\,\text{in}\) — refer to applicable edition).