Civil Engineering Reference
In-Depth Information
different from the rectangular types, an equivalent square or rectangle that
encompasses the opening may be considered for defining prescribed limits.
k)
Eccentricity of web opening:
The eccentricity of the centre of the
opening with respect to the centre point of the critical diagonal crack (plane
of rupture) is expressed by the co-ordinates
e
x
and
e
y
as shown Figure 3.7.
The limits of eccentricity come from the maximum admissible size of web
opening and are given by
0.6
D
/4
For eccentricities
e
x
and
e
y
greater than
X
N
/4 and 0.6 D/4 respectively, the
limiting values are to be taken as
X
N
/4 and 0.6 D/4.
e
x
£
X
N
/4 and
e
y
£
(3.1)
Figure 3.7
Typical opening in the web and other dimensions (Ray and Reddy, 1979; Ray, 1980;
1982).
l)
X
net
and
Y
net:
These are dimensions of solid shear zone in the
X
and
Y
directions, obtained after deducting the dimensions of the web opening in
the respective directions, that is
X
net
= (
X
N
-
a
1
x
)
