Civil Engineering Reference
In-Depth Information
R
926 5
1 0
.
k
R
=
=
=
926 5
.
kN
d
γ
.
Rv
GEO limit state requirement NOT satisfied since design bearing resistance (926.5 kN)
<
design effects of actions (1326.9 KN).
R
F
926 5
1326 9
.
.
d
Over-design factor
,
Γ =
=
=
0 70
.
d
This example illustrates the need to check the limit state requirements for both combi-
nations and for both the undrained and the drained states. In this case, the footing is
inadequately designed and the dimensions of the footing would have to be increased
to ensure the requirements are met in all cases.
Example 9.8:
Bearing resistance - vertical and horizontal
loading
In accordance with Eurocode 7, Design Approach 2, check compliance of the bearing
resistance limit state under drained conditions of the square pad foundation shown in
Figure
9.12.
The footing is supporting a concentric square column which is carrying both perma-
nent and variable vertical loading, together with a transient horizontal load applied as
shown.
The ground water table is coincident with the ground surface, and the following data
is provided:
Characteristic vertical permanent load, V
G;k
=
800 kN
Characteristic vertical transient load, V
Q;k
=
400 kN
Weight density of soil,
γ
soil
=
19.0 kN/m
3
Effective cohesion, c
′
=
0 kPa
Angle of shearing resistance,
φ
′
=
30°
Characteristic horizontal transient load, H
Q
=
100 kN
Weight density of concrete,
γ
concrete
=
24 kN/m
3
V
G
, V
Q
H
Q
0.5 m
GWT
3.0 m
2.0 m
0.5 m
3.0 m
Fig. 9.12
Example
9.8.
