Summary of the capabilities of the program PCSheetPileWall
For the overall picture see: the complete help pages (should be unzipped !!)
With the aid of this program the displacements and the force
distribution of a sheet pile wall construction can be calculated.
NEW
For stress checks both classic safety coefficients and u.c.- values
according Eurocode 7 (EN 1997-1) are supported
The figure below gives an
impression of options present into the sheet pile wall program.
Beneath an impression is given
of the per construction phase calculated moment, shear force and displacement
distributions.
Beneath an impression is given
of the per construction phase calculated water and total pressure
distributions at the left and right side
of the sheet pile wall.
An outline
of the capabilities of the program:
1. Levels
The program has the capability
to locate the top of the sheet pile wall, the place of anchors, soil layers
etcetera according two different systems of axes.
a. Vertical axis pointing downwards. The zero point is the top
side of the sheet pile wall.
b. Vertical axis pointing upwards. The zero point is that of the
national surveying system of levels.
2. Sheet pile wall
The sheet pile wall in vertical
direction can consists out of more than one section with different values for
the moment of inertia and elastic modulus.
The default acting width of
the sheet pile wall is 1 m. This values can be decreased, by which graduated
sheet pile walls can be calculated for example.
Further the program has a
design option by which the length of a sheet pile wall from a entered start
length and with a certain step size by the program will be enlarged
automatically.
For the input of the section
properties of a sheet pile wall these can be loaded from a standard library of
commercial available sheet pile sections included.
The program has the ability to
calculate the cross-section properties of a so called combi
wall, existing of circular shaped tubes with standard sheet pile sections in
between.
At default the orientation of
the sheet pile wall is vertical; an option is present to give the sheet pile
wall a certain inclination.
3. Surface and (ground) water levels
Dependent of the choice made
the surface level can have different shapes per construction phase:
a. Surface level is: horizontal and plain
b. Surface level is:
sloping and plain
c. Surface level is: bended; consisting of n bend points and n-1 straight lines (Culmann method).
The program has no preference
with regard what will be entered al the left of right side of the sheet pile
wall.
The excavations at the 3
figures above could have taken place at the right side also.
Water levels
From the entered (ground) water
level to below a hydrostatic build up of water stresses takes place.
The volume weight of the water
is by default 9.81 kN/m3, but this can be changed by the user when
needed.
Per entered soil layer, in
relation to the hydrostatic stress distribution, an extra under or over water
pressure can be entered if necessary; provided that this option is switched on.
The under and over pressures
can be entered.
4. Vertical surcharges acting on the surface level
Dependent on the choice for
the kind of surface level (see at preceding point 3) different kinds of
surcharges acting onto the surface level per construction phase can be entered
at the left and/or right side of the sheet pile wall.
a. Surface level: horizontal and plain or
b. Surface level: sloping and plain
- equal distributed surcharge
- trapezium shaped surcharge
- Line load
- Point load
- Arbitrary shaped surcharge
c. Surface level: bended; existing out of n bend points and n-1 straight lines (Culmann method).
- Line loads
- Block loads
Further at an arbitrary place
onto the sheet pile wall a vertical line load can be placed.
For the calculation it is
taken into account that this vertical normal force has an influence on the size
of the moment distribution at the sheet pile wall (2e order effects
caused by the deflections of the sheet pile wall).
5. Horizontal
conditions
Per construction phase the
following horizontal acting entities can be entered:
- anchors (or struts) with an
anchor bulkhead when needed; prestressing and a
maximum load capacity can be entered
- spring supports
- fixed supports
- moments acting at a certain
onto the sheet pile wall
- under water concrete
- arbitrary shaped horizontal
load acting onto the sheet pile wall
6. Soil
properties
Dependent on the choice at various
setups
the strength and stiffness properties can be entered at a different way.
- the user does enter the
friction angle and the angle of wall friction per soil layer apart; the program
does calculate the needed horizontal active, neutral and passive effective
stress coefficients (labda values) from it
- the user does enter the
horizontal active, neutral and passive effective stress coefficients (labda values) directly into the program.
When the choice has been made
for bended surface levels (Culmann) or sloping plane surface levels than the second
option is not possible however.
When this is setup the number
and properties of soil layers can be different for each construction phase,
otherwise the soil properties are equal for all construction phases..
The stiffness of the is
reproduced with the aid of a spring constant This spring constant can have a
linear distribution in size over the thickness of a soil layer.
The choice can be made for a
linear course of the spring stiffness between the active and passive
displacement or a non linear course (tri-linear).
linear course
of the spring stiffness (single spring stiffness)
as an alternative for the input of the spring
constant the size of the horizontal stretch can be entered also (a less common
approach)
non constant
value for the spring stiffness; approximation by 3 straight lines
input 3 secans values (k1,
k2 and k3)
The values of 50% and 80% are
the default values; these can be changed by the user however.
7. Input parameters
The input of data into the
program is divided into the next parts.
8. Diaphragm
walls
With the entered properties of
a concrete diaphragm wall the cracked bending stiffness will be calculated by
the program.
Next to the non-linear
behaviour of the soil the behaviour of the diaphragm wall is non-linear too
therefore.
