ProSheet Guidelines

ProSheet 2.2 06-06 Design software for sheet pile retaining walls

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Introduction ProSheet 2.2 Design program developped in collaboration with the Sheet Piling department of ARCELOR COMMERCIAL RPS: • allows quick dimensionning of steel sheet pile retaining walls • designed for simple structures and pre-dimensionning (refer to chapter “ possibilities “)

• geotechnical knowledge / backround required (definition of soil characteristics / calculation of retaining walls)

The results produced by this method have to be checked carefully by the user in order to make sure that modelization of the soil-structure interaction is accurate enough. 2

Introduction (...) Calculation method: • Fixed earth support according theory of Dr. Blum • Limit earth pressure - earth resistance Ka / Kp (Caquot / Kerisel)

Three static systems are possible: • Cantilever • Free earth support with one layer of anchor or struts • Fixed earth support with one layer of anchor or struts (Blum)

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General informations • Installation and configuration – Two languages are possible (F or GB) ° separate directories if both versions are installed – Configuration: decimal symbol = " . " (see also "Read-me" / evtl. use "French-Switzerland") – Metric or imperial units • Convention (see also "Help"-File) – Levels º positive downwards, refered to level ± 0.00 º negative upwards – Wall friction angle (to be introduced manually) º Earth pressure : δa = positive º Earth resistance : δp = negative 4

Possibilities • Continuous sheet pile wall design with: – 1 retaining level (anchorage or struting) – rear anchor wall – simulation of construction stages NOT possible Be careful: construction stage could guide the design ! – catalogues of ARCELOR sections ° AU, PU, AZ, Coldformed OSP ° not included: HZ-AZ combined wall system • Various options – uniforme surcharge load of type Caquot – lineare surcharge load of type Boussinesq – concentrated forces – additional pressures on the wall

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Dimensionning of main wall Three static systems are possible

Cantilever wall Hrecom.: 5 à 6 m Mbend Ê / fmax Ê length Ê

Anchored / strutted wall free earth support Mbend. Ê / R Ê minimum pile length 6

Anchored / strutted wall fixed earth support Mbend. Ì / R Ì longer pile than free meth.

Dimensionning of anchor wall Two static systems are possible - free earth support

- fixed earth support Ra,h

Assuming identical soil conditions and tieback load: deeper anchor level Ö sheet pile length Ì

higher anchorage level Ö sheet pile length Ê

Chosen system depends for ex. on construction stages, installation possibilities, a.s.o. 7

Restrictions • Not included options: – partial coefficients (SLS / ULS, Eurocodes) – seismic effects ⇒ design values to be introduced manually • and: – distance between main and anchor wall (Kranz, Jelinek, …) – slip cercle analysis (Bishop, …) – hydraulic failure – discharge through interlocks ⇒ Use different software

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Example : Anchored quay wall Geometry:

Main wall

Traffic load S

0.00 Bollard H

0.50 1.50

0.50

retaining height:5.00 m

•

final level:

0.50 m

•

anchor level:

1.50 m

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water:

4.00 / 2.50 m

Soil conditions: 2.50 5° Sand (fill)

4.00

•

sand:

ϕ’ = 30.0°

γ / γ ’ = 18 / 10 kN/m3

Ra

•

5.50

5°

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clay:

ϕ = 27.5° c’ = 5 kN/m2

γ / γ ’ = 19 / 9 kN/m3

Clay

Loadings: surcharge: bollard:

?

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S = 20 kN/m2 H = 50 kN/m

Units, configuration and projet info ƒ Start Prosheet ƒ Set options: •Units •Projet info •Configuration

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« Help » ‘Help’- File ˆIntroduction ˆExample ˆConventions ˆHelpful hints ˆHelp (contacts)

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Create a new file

Clic on the arrow of the « tool box »

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Design data

ƒ Soil level ƒ Water level ƒ Uniform surcharge load ƒ Earth support ƒ Continue with ‘ Soil Layers ’ ƒ Don’t clic directly on ‘OK’

ƒ Fill in at least : ‘GeoData’ / ‘Soil Layers’ / ‘Pile Section’ 13

Soil Layers

(1/3)

ƒ Soil characteristics: γ / ϕ / δ / c’

ƒ Add or delete soil layers ƒ Note : Layer Tip = lower level of soil layer

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Soil Layers (2/3)

Important: ƒ Put lowest soil level deeper than assumed embedment depth ƒ δp = negative ƒ Check if automatic calculation for Kph is activated

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Soil Layers (3/3) ƒ Copy from ‘Layers in front’ to ‘Layers behind’ ƒ Change signe of δa ƒ Check if automatic calculation for Kah is activated

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Concentrated loads: vertical, horizontal

ƒ Loads are positive downwards resp. to the left

•Clic on ‘+ / -’ to add or delete a ligne

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Sheet pile section / Steel grade First choice: AU 14 S 270 GP

Safety factor is only applied on yield point (steel stresses) !

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Results: All values / Extremal values / Pile check …

Clic on ‘Table’ (explorer) to get all the results Deflection

Pile toe level

Safety on steel stress

Pile length Overlength Δx Anchor load Ra,h 19

Extremal values / All values

Level ‘z’

Value

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Diagrams

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Earth pressure coefficients

To check values of Kah and Kpk ⇒ return to the file ‘Soil layers’

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Printing the results (tables and graphs)

Printing

Right button

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Error messages

ƒ Soil resistance << soil pressure ƒ Check depth of soil layers (tip) Increase depth ƒ Check soil values coefficients, weight, cohesion ...

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Anchor wall

2 possibilities: • create a new file • add to existing main wall

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Design data

Factor on anchor force Example: simulation of anchor failure: S = 1.50

Earth support

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Soil layers Copy values from main wall

Continue with: ƒ Automatic Kph ƒ Layers behind ƒ Automatic Kah ƒ Change sign of δa ƒ ….

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Sheet pile section / Steel grade

Choose a smaller section than main wall

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Error messages To be checked: ƒ Anchor level ƒ Tip of lowest soil layer ƒ Soil values ƒ Safety on anchor force ("Floating point error" : S = 0.00)

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Results

In case of ‘ free earth support ’ Short pile length Overlength Δx = 0.00

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Diagrams …

ƒ Pile toe at 3.10 m ƒ Anchor at 2.26 m ProSheet optimises the anchor level close to the given value

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Change values, if required ... If horizontal anchorage is required: Change anchor level

Change to ‘fixed earth support’

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New results …

In case of ‘ fixed earth support ’ ƒ Lower toe level ⇒ longer piles

ƒ Anchorage at level 1.50 m

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Results ...

If safety factor is too low, change pile section and / or steel grade Overlength Δx

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