Civil Engineering Reference
In-Depth Information
(iii)
Design actions:
Design value of self weight of concrete and soil (unfavourable, permanent action):
W
=
(
W
+
W
)×
γ
,
d
concrete
soil
G unfav
=
(
54 0
.
+
76 8
.
)
×
1 0
.
=
130 8
.
kN
Design value of the vertical structural (unfavourable) actions:
V
= ×
V
γ
+ ×
V
γ
=
(
800 1 0
×
.
)
+
(
350 1 3
×
.
)
=
1255
kN
d
G
G unfav
,
Q
Q unfav
,
Design effect of actions (i.e. sum of vertical forces):
F W V
=
+ =
130 8 1255
.
+
=
1385 8
.
kN
d
d
d
(iii)
Design material properties:
=
c
200
1 4
=
u k
;
Design cohesion c
:
=
142 9
.
kPa
u d
;
γ
.
cu
=
γ
γ
γ
20
1
=
k
3
Design weight density of soil
:
γ
=
20 N m
k
/
d
(iv)
Design geometry:
No eccentric loading,
⇒
A'
=
B
×
L
=
2.0
×
2.0
=
4.0 m
2
No inclined loading,
⇒
i
c
=
1.0
Foundation base horizontal,
⇒
b
c
=
1.0
s
c
=
1.2 (EN 1997-1: 2004, Annex D)
(v)
Bearing resistance:
′
= +
R A
/
(
π
2
)
c b s i
+
q
u c c c
R
k
=
4 0
.
×
[(
5 14 142 9 1 0 1 2 1 0
.
×
.
× × ×
.
.
.
)
+
30
]
=
3645 6
.
kN
R
γ
3645 6
1 0
.
k
R
=
=
=
3645 6
.
kN
d
.
Rv
GEO limit state requirement satisfied since design bearing resistance (3645.6 kN)
>
design
effects of actions (1385.8 KN).
R
F
3645 6
1385 8
.
.
d
Over-design factor
,
Γ =
=
=
2 63
.
d
ii/
long-term state
The ground water level is taken as coincident with the ground surface (see Section
9.5.2
and
EN 1997-1:2004 §2.4.6.1(11)).
(11) Unless the adequacy of the drainage system can be demonstrated and its maintenance
ensured, the design ground-water table should be taken as the maximum possible level,
which may be the ground surface.
EN 1997-1:
2004
§2.4.6.1(11)
1.
Combination 1 (partial factor sets A1 + M1 + R1)
