Civil Engineering Reference
In-Depth Information
footing will carry an applied vertical load of magnitude 85 kN per metre run. The
load will act on the centre-line of the footing.
Using Eurocode 7 Design Approach 1, determine the magnitude of the over-
design factor for the bearing resistance limit state under undrained conditions..
Answer
1.53 (DA1-1); 1.56 (DA1-2)
If you were to include depth factors in the design procedure, what would be the
revised value of the over-design factor for each combination?
Answer
1.79 (DA1-1); 1.81 (DA1-2)
Note:
Adopting depth factors in the design will invariably lead to higher values of
over-design factor.
Exercise 9.4
A rectangular foundation (2.5 m
×
6 m
×
0.8 m deep) is to be founded at a depth
of 1.2 m in a dense sand (c
′
=
0;
φ
′
=
32°;
γ
=
19.4 kN/m
3
). The unit weight of con-
crete
=
24 kN/m
3
. The foundation will carry a vertical line load of 250 kN/m at an
eccentricity of 0.4 m.
By following Eurocode 7, Design Approach 1 establish the proportion of the avail-
able resistance that will be used.
Answer
16% (DA1-1); 24% (DA1-2)
Note:
The proportion of available resistance that will be used is determined by
taking the reciprocal of the over-design factor.
