EC7 Pad foundation - Caesoft
EC7 Pad foundation - Caesoft
EC7 Pad foundation - Caesoft
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<strong>Pad</strong> <strong>foundation</strong><br />
Eurocode 7
<strong>Pad</strong> <strong>foundation</strong><br />
Support forces (from the analysis)<br />
Design approach<br />
Partial factors<br />
actions<br />
soil<br />
properties<br />
resistance<br />
1.<br />
Combination 1<br />
Combination 2.<br />
ULS<br />
SLS<br />
A 1<br />
A 2<br />
M 1<br />
M 2<br />
R 1<br />
R 1<br />
2.<br />
ULS<br />
A 1<br />
M 1<br />
R 2<br />
3.<br />
SLS<br />
A 2<br />
M 2<br />
R 3<br />
Sets of partial factors<br />
A for action or effect of action<br />
M for soil parameters<br />
R for resistance
<strong>Pad</strong> <strong>foundation</strong><br />
Soil<br />
Basic soil parameters:<br />
• weight density<br />
• angle of shearing resistance<br />
• cohesion (fine soil)
<strong>Pad</strong> <strong>foundation</strong><br />
Type, geometry and material of footing<br />
• plate footing<br />
• stepped footing<br />
• sloped footing
<strong>Pad</strong> <strong>foundation</strong><br />
Bearing resistance<br />
(Determine of <strong>foundation</strong> sizes B and L)<br />
Rv<br />
= sγ<br />
⋅γ<br />
′⋅ B′⋅<br />
Nγ<br />
⋅iγ<br />
⋅bγ<br />
⋅0,<br />
5 + sq<br />
⋅q<br />
⋅ N<br />
A<br />
eff<br />
q<br />
⋅i<br />
q<br />
⋅b<br />
q<br />
+<br />
s<br />
c<br />
⋅c<br />
⋅ N<br />
c<br />
⋅i<br />
c<br />
⋅b<br />
c<br />
Bearing capacity calculations take<br />
account of eccentric loading by<br />
assuming that the load acts at the<br />
centre of a smaller <strong>foundation</strong>, as<br />
shown in Figure
<strong>Pad</strong> <strong>foundation</strong><br />
Sliding resistance<br />
Verification of sliding resistance between the blind concrete and<br />
the ground and between the base and the blind concrete<br />
Utilization factor : τ<br />
τ<br />
ed<br />
Rd
<strong>Pad</strong> <strong>foundation</strong><br />
Structural design (RC <strong>foundation</strong>)<br />
Determine the reinforcements<br />
EN 1997-1 provides a short section on the structural design of spread<br />
<strong>foundation</strong>s. This is dealt with by Eurocode 2.<br />
Result:<br />
Longitudinal reinforcement<br />
A sx , A sy , A s’x , A s’y
<strong>Pad</strong> <strong>foundation</strong><br />
Punching shear check<br />
Determine concrete punching<br />
shear capacity vRd,c (without<br />
shear reinforcement) on the<br />
control perimeters around<br />
loaded areas<br />
Utilization factor<br />
: v<br />
v<br />
ed<br />
Rd,c
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