Civil Engineering Reference
In-Depth Information
Extruded coupler splice.
(Courtesy of Dywidag
Systems International,
USA, Inc.)
they must be suitably confined (by closed ties, closed stirrups, or spirals). Section
12.17.4 further states that when end-bearing splices are used in columns, in each face
of the column more reinforcement has to be added that is capable of providing a ten-
sile strength at least equal to 25% of the yield strength of the vertical reinforcement
provided in that face.
The Code (12.14.2.1), with one exception, prohibits the use of lap splices for #14 or
#18 bars. When column bars of those sizes are in compression, it is permissible to connect
them to footings by means of dowels of smaller sizes with lap splices, as described in Sec-
tion 15.8.2.3 of the Code.
7.15 SI EXAMPLE
EXAMPLE 7.9
Determine the development length required for the epoxy-coated bottom bars shown in Figure 7.22.
(a)
assuming
K
tr
0 and
(b)
computing
K
tr
with the appropriate equation,
f
y
420 MPa and
c
f
21 MPa.
#10
stirrups @
200 mm
o.c.
600 mm
680 mm
4 #25
80 mm
80
mm
3@80 mm
= 240 mm
400 mm
80
mm
Figure 7.22
