Page 123 - Design of Reinforced Masonry Structures

MATERIALS OF MASONRY CONSTRUCTION 3.17

N for New Billet
S for Supplemental Requirements A615
A for Axle
I for Rail
W for Low Allow
(a)

Main Ribs Main Ribs
Letter or Symbol for Letter or Symbol for H
H Producing Mill H Producing Mill

6 Bar Size #6 Bar Size #11 11
11
One Line Type Steel
N (per SI)
Type Steel (N-new billet) S
(New Billet) S (W-low alloy)
(“S” per SI)
Grade Mark of Minimum 60
Yield Designation
Grade 40 Grade 60 Grade 60
Grade 50 and A706 and A706
(b)

FIGURE 3.5 Deformed reinforcing bars. (a) Examples of reinforcing bars (CRSI). (b) Identification marks
rolled on to the surface of bars. (Courtesy: Concrete Reinforcing Steel Institute.)

grade of reinforcing steel and the bar sizes as these may be subject to code-mandated
restrictions. For example,
1. Both the MSJC-08 Code [3.2] and 2009 IBC [3.6] permit only Grades 40, 50, and 60
reinforcement (Grade 75 is not listed); however, the allowable stresses in tension are
different for different grade steels as shown in Table 3.5 [3.2 (Section 2.3.2.1)].
2. The minimum diameter of bend measured on the inside of bars, other than for stirrups
and ties, must not be less than that shown in Table 3.6 [3.3 (Section 1.15.6)]. The radius