Civil Engineering Reference
In-Depth Information
5
×
4.0 = 20.0 m
F
1
Z
F
2
These columns
are removed in
th
e ground storey
X
F
2
Solid slabs
F
1
Figure 4.47
Sectional elevation and plane of the building
5.00
4.00
3.00
2.00
1.00
0.00
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
Period (sec)
Figure 4.48
Recommended elastic spectrum (5% critical damping)
The elastic period of the structure may be estimated by the following:
34
(
)
T
=
0
.073
h
(4.42)
tot
where
h
tot
is the total height (in metres) from the foundation level. The design base shear (
V
) and the
storey seismic forces (
F
i
) can be estimated by employing the relationships given below:
VCW
=
(4.43)
