Manual utilizator Slope - GeoStru Software

27
Slope
the effective critical state angle of shearing resistance, ' cv ;d
,
for cast-in-situ
concrete foundations and equal to 2/3 ' cv ;d
for smooth precast foundations.
Any effective cohesion c' should be neglected.
11.For undrained conditions, the design shearing resistance, R d
, shall be
calculated either by factoring the ground properties or the ground resistance
as follows:
R d
= A c
c u;d
(6.4a)
or
R d
= (A c
c u;k
) / γ R;h
(6.4b)
12. If it is possible for water or air to reach the interface between a foundation
and an undrained clay subgrade, the following check shall be made:
R d
= 0,4 V d
(6.5)
13. Requirement (6.5) may only be disregarded if the formation of a gap
between the foundation and the ground will be prevented by suction in areas
where there is no positive bearing pressure.
6.5.4 Loads with large eccentricities
1. Special precautions shall be taken where the eccentricity of loading exceeds
1/3 of the width of a rectangular footing or 0,6 of the radius of a circular
footing. Such precautions include:
- careful review of the design values of actions in accordance with 2.4.2;
- designing the location of the foundation edge by taking into account the
magnitude of construction tolerances.
2. Unless special care is taken during the works, tolerances up to 0,10 m should
be considered.
6.5.5 Structural failure due to foundation movement
1. Differential vertical and horizontal foundation displacements shall be
considered to ensure that they do not lead to an ultimate limit state occurring
in the supported structure.
© GeoStru Software-Slope 8.0.1