Civil Engineering Reference
In-Depth Information
vertical spacing of the steel,
S
2
and width of beam
b
, while the
reinforcement ratio for the total horizontal steel
r
l
is based on the total steel
area and the effective cross-sectional area,
bd
.
For any given set of the
C
values the ratio of the calculated shear strength
to the experimental shear strength
R
F
for each test is determined. The mean
value and the coefficient of variation of this ratio for the 63 tests are then
computed. A search for the least coefficient of variation leads to the
following set of
C
values:
C
=0.03,
C
l
=0.26,
C
t
=0.
1
2 and
C
s
=0.3.
Substituting these constants into Eqn (7.19) gives the explicit formula
proposed for shear strength design:
(7.21)
with the limitations The coefficient
K,
representing the shear span effect, is given in Eqn (7.12). The shear
strength
V
n
is then obtained from Eqn (7.2).
Figure 7.12
Comparison of proposed explicit formula (Eqn 7.21) with tests
