F. K. Kong MA, MSc, PhD, CEng, FICE, FIStructE, R. H. Evans CBE, DSc, D ès Sc, DTech, PhD, CEng, FICE, FIMechE, FIStructE (auth.)-Reinforced and Prestressed Concrete-Springer US (1987)

82 Axially loaded reinforced concrete columns
(b)
(c)
(d)
(e)
(f)
(g)
(h)
elevations, the remaining bars being indicated by short lines. Thus in
Fig. 3.6-2(a), only one of the six size 20 longitudinal bars is drawn in
full.
(Note: In beams, all longitudinal bars are shown in full on the
elevation. )
Only one link or set of links in each column (or beam) is drawn in full;
a short line is used to indicate the first or the last link of a group, as
shown in Fig. 3.6-2(a).
The positions of bars are established by dimensioning to the faces of
the existing concrete or the formwork, thus enabling the steel fixer to
work from these faces. See, for example, the 75 mm dimension that
establishes the position of the longitudinal bars in Fig. 3.6-2(a).
All bars that need to be fixed in a certain part before it can be
concreted must be detailed with that part; these bars are then shown
in broken lines in succeeding portions. Thus, in Fig. 3.6-2(a), the
broken lines represent the longitudinal bars that are separately
detailed with the column length underneath the lower floor level.
In Fig. 3.6-2(a), current British detailing notation [9] has been used
to describe the reinforcement. Briefly, the sequence of description is
as follows:
Number, Type, Size, Mark, Centres, Location
Consider, for example, the longitudinal bars; in the labeI '6T20-1' in
Fig. 3.6-2(a), the first figure denotes the number of bars, the letter
the type of bar-T for high yield deformed bars and R for plain round
bars-the figure after the letter denotes the bar size (i.e. the nominal
diameter of the bar in millimetres) and the number after the hyphen
is the identification bar mark. Thus 6T20-1 represents six high yield
deformed bars of size 20 mm, the bars being identified by the bar
mark 1; in this example, bar mark 1 refers to a cranked bar bent to
the dimensions A, B, C, D and radius r specified in Fig. 3.6-3(a).
Similarly, the labeI 13R8-2-200 in Fig. 3.6-2(a) refers to 13 mild
steel bars of size 8 mm identified by the bar mark 2, the bars being
spaced at 200 mm centres. In this example, bar mark 2 refers to a link
bent to the dimensions A, B and radius r specified in Fig. 3.6-3(b);
bar mark 3 refers to a link bent as specified in Fig. 3.6-3(c).
The fuB notation of a bar or group of bars is given once only,
preferably in plan or elevation, though it may be given in section in
exceptional cases. Thus in Fig. 3.6-2, the full notations are all given
in the elevation in Fig. (a); the section in Fig. (b) indicates the
position and bar mark of every bar included in that section.
In Fig. 3.6-3 the bending details are specified in accordance with
BS 4466 [10]-see Figs A2-1, A2-2 and A2-3.
So far we have concentrated our attention on how to detail structural
concrete, so as to communicate effectively with the men on the
construction site. In fact, the performance of the structure itself is
significantly affected by the reinforcement details. Readers interested
in the effect of detailing on structural behaviour are referred to the
Handbook of Structural Concrete [11].