Commercial Building Inspector B2Roof Ceiling ConstructionMedium
A structural engineer specifies a reinforced concrete roof slab for a parking garage. The plans indicate the use of Grade 60 deformed reinforcing bars. What is the minimum specified yield strength, in psi, for these reinforcing bars according to ASTM A615?
- A50,000 psi
- B40,000 psi
- C60,000 psi
- D75,000 psi
Show answer & explanationAnswer & explanation
Correct answer: C. 60,000 psi
ASTM A615 specifies the standard requirements for deformed and plain carbon-steel bars for concrete reinforcement. Grade 60 bars have a minimum specified yield strength of 60,000 psi (420 MPa).
Why the other options are wrong
- A. 50,000 psi is not a standard grade in ASTM A615 for common reinforcing bars.
- B. 40,000 psi is the yield strength for Grade 40 bars.
- D. 75,000 psi is the yield strength for Grade 75 bars, which are higher strength.
ASTM A615 Grade 60 Rebar
A standard specification for deformed carbon-steel reinforcing bars with a minimum yield strength of 60,000 psi.
- Commonly used in concrete construction.
- Grade number indicates minimum yield strength in ksi (kilopounds per square inch).
- Ensures structural integrity and ductility of reinforced concrete.
Memory trick: Rebar grades are like strength levels, higher numbers mean stronger steel.