Steel Reinforcement and Types of Steel Reinforcement

Steel Reinforcement

reinforcement steel (Rebar), or a deformed bar, is a common steel bar, and is commonly used in reinforced concrete and reinforced masonry structures. It is usually formed from carbon steel, and is given ridges for better mechanical anchoring into the concrete. In Australia, it is colloquially known as reo

1.  General

• Standard Reinforcing Bar Markings

• Most common types for non-prestressed members: 

            hot-rolled deformed bars

            welded wire fabric

• Areas, Weights, Dimensions

2.  Types

• ASTM A615 - Standard Specification for Deformed and Plain-Billet Steel Bars

           Grade 60:  fy = 60 ksi, #3 to #18

                   most common in buildings and bridges

          Grade 40:  fy = 40 ksi, #3 to #6

                  most ductile

         Grade 75:  fy = 75 ksi, #6 to #18

• ASTM A616 - Rail-Steel Bars
• ASTM A617 - Axle-Steel Bars
• ASTM A706 - Low-Alloy-Steel Bars

              more ductile GR60 steel

              min. length of yield plateau = esh/ey = 5

3.  Stress versus Strain

• Stress-Strain curve for various types of steel reinforcement bar.

• Es = Initial tangent modulus = 29,000 ksi (all grades)

• Note:
• GR40 has a longer yield plateau

Source : Dr. E.W. Sandt