CSLB General Building (B)Site Work, Foundations and ConcreteMedium
A structural plan calls for Grade 60 reinforcing steel to be used in a footing. What does the designation "Grade 60" specify about this rebar?
- AThe bar has a minimum specified yield strength of 60,000 psi
- BThe bar has a nominal diameter of 60/8 inch
- CThe bar can support a maximum load of 60,000 pounds regardless of size
- DThe bar was manufactured to a 60-year design life standard
Show answer & explanationAnswer & explanation
Correct answer: A. The bar has a minimum specified yield strength of 60,000 psi
Rebar grade designations refer to the minimum yield strength of the steel in thousands of pounds per square inch (psi). Grade 60 rebar has a minimum yield strength of 60,000 psi, making it the most common reinforcing steel grade used in residential and commercial concrete construction.
Why the other options are wrong
- B. Bar diameter is indicated by bar number (e.g., #6 = 6/8 inch), not the grade designation.
- C. Load capacity depends on bar size (cross-sectional area) as well as yield strength, not a fixed value.
- D. Grade designations relate to steel strength, not a design life or service year rating.
Rebar Grade Designation
A rebar grade number indicates the minimum yield strength of the steel in ksi (thousands of psi); Grade 60 rebar has a minimum yield strength of 60,000 psi.
- Grade 60 = 60,000 psi minimum yield strength
- Most common rebar grade in general construction
- Bar size (#3-#18) is separate from grade designation
Memory trick: 'Grade equals strength in thousands' — Grade 60 means 60,000 psi yield.