Discussion
Consider the following statements about confinement.
1. Hoops put the core into triaxial compression.
2. The cover concrete is counted as confined.
3. Hooks are bent at 135 degrees into the core.
Which of the statements are correct?
Answer: B
Confinement acts on the core alone, and the cover spalls away at the strains where it matters, so the second statement is false. The hook detail in the first and third statements is what keeps the confinement in place after spalling.
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