Civil Engineering Reference
In-Depth Information
Figure 16.4
Shear reinforcement for slabs at columns.
The main advantage of shearheads is that they push the critical sections for shear far-
ther out from the columns, thus giving a larger perimeter to resist the shear, as illustrated
in Figure 16.5. In this figure,
v
is the length of the shearhead arm from the centroid of the
concentrated load or reaction, and
c
1
is the dimension of the rectangular or equivalent rec-
tangular column or capital or bracket, measured in the direction in which moments are
being calculated. The Code (11.12.4.7) states that the critical section for shear shall cross
the shearhead arm at a distance equal to [
3
4
(
c
1
/2)] from the column face, as shown in
Figure 16.5(b). Although this critical section is to be located so that its perimeter is a min-
imum, it does not have to be located closer to the column face or edges of capitals or drop
v
