(3) Bending and placing bars. Bars are
bends, and beams located on the plan. The slab and
manufactured in straight lengths and are cut and bent.
beam schedules are keyed to marks on the plan. For
Bars are bent by the steel fabricator in the shop and
example note that D2 is a band mark described on the
sent to the job ready to place without further cutting
second line of the slab schedule and 2B6 is beam
or bending. The bars are placed and wired in position
mark that is the first described in the beam schedule.
before concrete is poured.
The bending schedule is keyed to a bar type number
given in the slat schedule. The bottom bars of slab
band mark D2, for example, are listed in the slat
schedule as type R500. The dimensions and;
2-14. REINFORCED CONCRETE
description of the type R500 bar bend are provided in
the bending schedule.
You should know the
a. Location. Location of the reinforcing steel
following about the data listed in the reinforcing
is shown in detail drawings of the various structural
schedules. The No. columns list the quantity
members. It is not possible to show the shapes and
requirement. Size refers to the bar diameter, length
sizes of the reinforcing bars by the usual orthographic
to the stretchout length, and type to the shape of the
views; therefore, a systematic method of marking is
bar. Bending details pertain to the outside lengths of
used in which bars are identified by symbols and
the straight and curved segments. The shipping mark
Once assigned, the same
provides the dimensions in code, with the first
reference number is used to identify the bar in any
number giving the bar diameter in multiples of 1/8
view in which it appears. Reinforcement size-and-
inch and the remaining three or four numbers the
shape details are provided in a separate reinforcement
overall bar length in feet and inches. Mark 5246
detail drawing which consists of a reinforcement
indicates 5/8-inch diameter and 24 feet, 6 inches
schedule and diagrammatic bar-bending details.
long, while mark 31810 denotes 3/8-inch diameter
and 18 feet, 10 inches long.
b. Symbols. The symbols used in drawings of
reinforced concrete structures include the material
d. Bar-Bending Details. Bar-bending details
symbol for concrete in section and the symbols for
resemble the diagrammatic shapes shown in figure 2-
19. The manner in which bar-bending details are
indicated in reinforcing schedules is illustrated in
(1) Concrete. The symbol for concrete (fig
2-2) indicates coarse and fine aggregate. Fine
aggregate is represented by fine dots and coarse
e. Section Details. Figures 2-21 and 2-22
aggregate by irregularly drawn triangles.
illustrate how basic information is given in typical
reinforcement section details. You can read both
(2) Reinforcement. Figure 2-19 presents
figures in the same manner. The principal difference
the symbols for typical shapes of reinforcing steel.
between these illustrations is that figure 2-21 depicts
Figures 2-20 through 2-22 illustrate some
vertical structures (column, pier, and walls), whereas
applications of these symbols. Note that in addition
figure 2-22 depicts horizontal construction items
to their symbolic representation, reinforcing bars
(beams and slab).
parallel to the section are represented by heavy
dashed lines; those perpendicular to the section are
(1) Look at the reinforced concrete column
represented by heavy round or square dots,
in figure 2-21. What you see is a plan and elevation
depending upon the cross-sectional shape of the bars.
section of a 14 x 14-inch (1' -2" x 1' -2") reinforced
concrete column with a 12-inch beam. There are four
In notes, the symbols ƒ and
are used to indicate
vertical 3/4-inch diameter round bars on 10-inch
round and square bars, respectively.
centers to be set 2 inches inside the face of the
concrete. Lateral ties of 1/4-inch diameter
c. Reinforcing Schedules. Figure 2-20 shows
a portion of a floor framing plan and provides
examples of reinforcing schedules for slabs, bar