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Performance of shell elements

November 20, 2012, 4:36 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

Tunnel lining can be modelled as a beam in PLAXIS 2D and as a plate in PLAXIS 3D. By using this element, 3 types of deformations are taken into account: shear deformation, compression due to normal forces and obviously bending. This document describes an example that has been used to verify the shell elements in PLAXIS.

Used version:

  • PLAXIS 2D - Version 2011
  • PLAXIS 3D - Version 2012

Related articles

Downloads

Validation-Performance of shell elements [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 3.66 MB
Validation-Performance of shell elements [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 9.19 KB
Validation-Performance of shell elements [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 10.95 KB
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Performance of springs

December 10, 2012, 1:04 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that has been used to verify that the performance of springs connected to floors and walls, is correctly implemented in PLAXIS

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Downloads

Validation-Performance of springs [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 395.07 KB
Validation-Performance of springs - model a [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.14 KB
Validation-Performance of springs - model b [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.34 KB
Validation-Performance of springs [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.86 KB
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Phi-c reduction and comparison with Bishop's method

November 7, 2012, 6:19 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that is used to verify the ultimate limit state capabilities of PLAXIS. The problem involves the stability of an embankment. PLAXIS results are compared with Bishop's method of slices (Verruijt, 2001). The influence of the load distribution in PLAXIS 3D is studied as well.

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Downloads

Validation-Phi-c reduction and comparison with Bishop's method [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 3.13 MB
Validation-Phi-c reduction and comparison with Bishop's method [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 4.01 KB
Validation-Phi-c reduction and comparison with Bishop's method [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 4.1 KB
Validation-Phi-c reduction and comparison with Bishop's method [3D effects] [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.46 KB
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Pulse load on a multi layer system: Comparison with spectral elements

January 2, 2013, 4:38 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that has been used to verify the dynamic response of a multi layer system due to a transient load pulse. For such a system, no analytical solution exists. For verification, the computational results of PLAXIS are compared with those obtained from a semi-analytical technique using the 'spectral element method' (Al-Khoury, Scarpas, Kasbergen & Blauwendraad, 2001).

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

This requires a dynamics module

Downloads

Validation-Shear deformation in structural elements [2D 2015.02].p2dxlogValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEother| 7.13 KB
Validation-Pulse load on a multi layer system [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 12.26 KB
Validation-Pulse load on a multi layer system [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 12.13 KB
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Shear deformation in structural elements

November 20, 2012, 1:47 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 2D 2012

PLAXIS takes into account the shear deformation in structural elements subjected to bending. For the verification of the resulting shear deformation different support conditions are considered. In this validation, the beams are clamped at the bottom and horizontally supported at the top. A bending moment is applied at the top of the beams.
The problem is modelled in PLAXIS 2D.

Related articles

Downloads

Validation-Shear deformation in structural elements [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 435.78 KB
Validation-Shear deformation in structural elements [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 7.13 KB
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Sliding block for testing interfaces

December 10, 2012, 3:06 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 2D 2012, PLAXIS 3D, PLAXIS 3D AE, PLAXIS 3D 2012

One of the particular features of PLAXIS is the use of interfaces for modelling soil-structure interaction. This document describes an example that has been used to verify the performance of these elements by means of a sliding block.

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Downloads

Validation-Sliding block for testing interfaces [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 2.15 MB
Validation-Sliding block for testing interfaces [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.89 KB
Validation-Sliding block for testing interfaces [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.93 KB
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Smooth rigid strip footing on elastic soil

November 6, 2012, 4:56 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that has been used to verify the elastic deformation capabilities of PLAXIS. The problem involves the settlement and stress distribution under a smooth rigid strip footing on elastic soil, according to Giroud (1972).

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Related articles

Downloads

Validation-Smooth rigid strip footing on elastic soil [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 2.14 MB
Validation-Smooth rigid strip footing on elastic soil [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 3.44 KB
Validation-Smooth rigid strip footing on elastic soil [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 3.34 KB
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Surface waves: Comparison with boundary elements

December 20, 2012, 1:13 am
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0
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

In this validation surface waves on an elastic half space are considered. In this case the surface waves are generated by a prescribed displacement that is activated harmonically. A comparison is made between the results from the PLAXIS dynamic module and results obtained by Chouw, Le & Schmid (1991) using boundary elements.

Used version:

  • PLAXIS 2D 2015.02- Dynamic Module
  • PLAXIS 3D AE.01 - Dynamic Module

This requires a Dynamics module

Downloads

Validation-Surface waves [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 507.76 KB
Validation-Surface waves [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 4.23 KB
Validation-Surface waves [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 4.3 KB
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Triangular earth dam

January 15, 2013, 4:19 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that has been used to verify the groundwater flow capabilities of PLAXIS: a triangular earth dam with a constant head on the left side and seepage on the right side.

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Related articles

Downloads

Validation-Triangular earth dam [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 4.54 MB
Validation-Triangular earth dam [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 3.23 KB
Validation-Triangular earth dam [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 3.38 KB
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Unconfined flow through a sand layer

January 8, 2013, 1:01 am
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that has been used to verify the groundwater flow capabilities of PLAXIS. The problem involves the unconfined flow through a sand layer and the resulting phreatic surface and total discharge.

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Related articles

Downloads

Validation-Unconfined flow through a sand layer [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 3.38 MB
Validation-Unconfined flow through a sand layer [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 3.38 KB
Validation-Unconfined flow through a sand layer [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 3.82 KB
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Unconfined flow through an earth dam

January 16, 2013, 1:03 am
$
0
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document verifies that groundwater flow principles are correctly implemented in PLAXIS. For that purpose, the water flow through an earth dam with drain in the downstream toe is studied. The flow in such a case is unconfined due to the unknown phreatic level and the unknown area of the seepage surface. This constitutes a problem which can be solved by the flow net method (Lambe & Whitman, 1979)

Used version:

  • PLAXIS 2D 2015.02
  • PLAXIS 3D AE.01

Related articles

Downloads

Validation-Unconfined flow through an earth dam [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 2.26 MB
Validation-Unconfined flow through an earth dam [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.45 KB
Validation-Unconfined flow through an earth dam [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.64 KB
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Updated mesh analysis of a cantilever

November 30, 2012, 3:33 am
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0
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Application:
PLAXIS 2D, PLAXIS 2D 2015

The range of problems with known solutions involving large displacement effects that may be used to test the large displacement options in PLAXIS is very limited. The large displacement elastic bending of a cantilever beam, however, is one problem which is well suited as a large displacement benchmark problem since a known analytical solution exists, see Mattiasson (1981).

Geometry non-linearity is of major importance in problems involving slender structural members like beams, plates and shells. For special problems of extreme large deformation an Updated mesh analysis is needed. For this reason PLAXIS involves a special module that was programmed sing the Updated Lagrangian formulation as described by McMeeking & Rice (1975).

Used version:

  • PLAXIS 2D 2015.02

Downloads

Validation-Updated mesh analysis of a cantilever [2015].pdfValidation description, version: PLAXIS 2D 2015pdf| 817.32 KB
Validation-Updated mesh analysis of a cantilever [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 6.99 KB
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Vertical dynamic response of a footing

January 7, 2013, 7:06 am
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0
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Application:
PLAXIS 2D, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

This document describes an example that has been used to verify that the dynamic response of a footing is correctly calculated in PLAXIS. For that purpose the response of a rigid circular footing subjected to a vertical harmonic load is studied.

Model geometry, generated mesh and dynamic boundary conditions

Used version:

  • PLAXIS 2D 2015.02 - Dynamic Module
  • PLAXIS 3D AE.01 - Dynamic Module

This requires a Dynamics module

Downloads

Validation-Vertical dynamic response of a footing [2015].pdfValidation description, version: PLAXIS 2D 2015 and PLAXIS 3D AEpdf| 1.5 MB
Validation-Vertical dynamic response of a footing [2D 2015.02].p2dxlogCommand log file for PLAXIS 2D 2015 to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.03 KB
Validation-Vertical dynamic response of a footing [3D AE.01].p3dlogCommand log file for PLAXIS 3D AE to create the model. Use 'Save as' and load it in the Commands Runnerother| 5.16 KB
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Geomechanical modelling of the Dutch radioactive waste disposal facility accounting for uncertainties

March 23, 2016, 8:21 am
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0
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Author:
P. J. Vardon, P. Arnold, M.A. Hicks, P.A. Fokker
Published on:
March, 2016
Application:
PLAXIS 2D

The current generic radioactive waste disposal concept in the Netherlands is designed to be situated in a Boom Clay stratum at approximately 500 m depth. The location of such a repository has not been decided and, as such, the design contains many uncertainties. The impact of these uncertainties are important to the feasibility of the repository design and construction, with respect to both stability and consequential f nancial performance. The objective of this study is to develop an approach that uses probabilistic methods to quantify uncertainties, and utilises PLAXIS to assess the geomechanical repository behaviour during and after construction. In addition, the new Thermal module in PLAXIS has been utilised to provide an initial assessment of the temperature changes in the Boom Clay. This research project was undertaken as part of the OPERA research programme.

 

Downloads

Plaxis_Bulletin_Iss39 Art1 - Geomechanical modelling of the Dutch radioactive waste disposal facility accounting for uncertainties.pdfpdf| 4.13 MB
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Back analysis of settlements beneath the foundation of a sugar silo by 3D finite element method

March 23, 2016, 8:28 am
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0
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Author:
B. Móczár, A. Mahler, K. Lődör, Z. Bán
Published on:
March, 2016
Application:
PLAXIS 3D, PLAXIS 3D AE

In the city of Kaposvár, Southwestern Hungary, a new sugar silo with a diameter of approximately 60 m and a storage capacity of 60,000 tons was constructed in 2013 on the site of Magyar Cukor Ltd. (Figure 1). The purpose of the recent study is to back analyse the foundation performance of the sugar silo. The behaviour of the sugar silo and its settlement were continuously monitored during the filling process by using geodetic methods. This enabled the back analysis of the silo foundation’s behaviour. The objective of the analysis presented herein is solely academic. Settlements are computed by means of a finite element model created based on the available soil investigation results and the results are compared with the measured data.

 

Downloads

Plaxis_Bulletin_Iss39 Art2 - Back analysis of settlements beneath the foundation of a sugar silo.pdfpdf| 8.04 MB
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2D Thermal analysis of soil freezing with flowing water

March 23, 2016, 8:35 am
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0
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Author:
J. Sopko
Published on:
March, 2016
Application:
PLAXIS 2D

Plaxis was contracted by Moretrench in the USA to provide assistance in setting-up 2D f nite element models for the analysis of time-dependent temperature development in frozen ground with f owing water. Thanks to PLAXIS Expert Services, valuable results have been obtained in terms of evaluating the time required to obtain a satisfactory frozen wall thickness depending on the water flow intensity generated by neighbouring dewatering.

Temperature distribution (left) and water flow (right) around freezing pipes

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Plaxis Viewer - standalone program to view results

March 31, 2016, 7:51 am
$
0
0
Application:
PLAXIS 2D, PLAXIS 2D 2016, PLAXIS 2D 2015, PLAXIS 3D, PLAXIS 3D AE

The PLAXIS Viewers are standalone programs and offer you and your clients the ability to view calculated PLAXIS 2D and PLAXIS 3D projects without the need of a licence.

The PLAXIS Viewer is part of your PLAXIS installation starting PLAXIS 2D 2016 and PLAXIS 3D AE.02. You will find the newest version of the PLAXIS Viewer in your installation directory (when you have installed the software). The Viewer works as a standalone application, so it can be copied to other locations or sent to your clients.

The PLAXIS Viewer can also be obtained by requesting it via these links:

Related articles

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Saving PLAXIS files for an older version

October 29, 2013, 7:08 am
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0
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Application:
PLAXIS 2D, PLAXIS 3D

It is not possible to save a Plaxis file in a format compatible for an older version. E.g. when creating / saving a file in PLAXIS 2D 2012, it is not possible to open this file in PLAXIS 2D 2011 or earlier.

Please note that PLAXIS is backwards compatible: Plaxis files made with an older version can be opened and used in a more recent version of the PLAXIS Input program. However, due to some low level changes, it might occur that is some cases not all data is fully compatible.
An example is the calculation result file format in 3D2013’s release. The input for the model was fully compatible however. For details, please see the related page PLAXIS 3D 2013 and older Plaxis files

Sharing of results

Sometimes, you may want to send the PLAXIS data to another party that does not have access to the latest PLAXIS version. In such cases, you can always let the other user use the latest Output program to inspect your files: the Output program (prior to PLAXIS 2D 2015 and PLAXIS 3D AE/2015) can be used as a results viewer without a licence. To do so, you can have the other party install the latest PLAXIS version on their computer, or you enclose the Plaxis Output program called with your results.

  • For PLAXIS 2D 2011 and PLAXIS 2D2012, this file is called plaxout.exe
  • And for PLAXIS 3D, this is called Plaxis3DOutput.exe

PLAXIS Viewer

For PLAXIS versions starting from PLAXIS 2D 2015 and PLAXIS 3D AE (2015), special free viewers are available. Please see the related article about the Plaxis Viewer - standalone program to view results

For support of older file versions, please see the related article about Output project compatibility.

Related articles

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Output project compatibility

August 15, 2013, 11:59 pm
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0
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Application:
PLAXIS 2D, PLAXIS 3D

Background

With the release of PLAXIS 2D AE and PLAXIS 3D 2013, the data format and data specifications were updated to allow for a more robust and flexible data structure, especially for pore pressures data. Reading in PLAXIS results made with older versions (2D2012/Classic and earlier, 3D2012 and earlier) is no longer possible due to this incompatible data format.

Whenever results are read in that are not compatible with the current Output program, the PLAXIS Output program will give a warning why this fails.

OLD_PROJECT; CODE=xx

When the project has been created using an older, incompatible version of PLAXIS 2D or PLAXIS 3D. To view the results for this project file, use an older version of PLAXIS Output.
Here, xx refers to the internal file version.

For projects made with PLAXIS 3D2012 or earlier, please use the Output version attached below.

NEW_PROJECT; CODE=xx

When the project has been created using a newer, incompatible version of PLAXIS 2D or PLAXIS 3D. To view the results for this project file, use a newer version of PLAXIS Output.
Here, xx refers to the internal file version.

OTHER_PRODUCT

Whenever a PLAXIS 2D project will be opened using PLAXIS 3D Output  (and vice-versa). Please use the original Output program of the corresponding PLAXIS version, i.e.

  • the PLAXIS 3D 2012.02 Output program with PLAXIS 3D 2012 models
  • and the PLAXIS 2D 2012.00 Output program with PLAXIS 2D 2012 models.

LEGACY

Legacy projects are PLAXIS 2D files made with PLAXIS 2D Version 8 and Version 9. Please use PLAXIS 2D Classic’s Output program (or earlier versions) to view the results for these files.

OPI

The PLAXIS Output program needs a special data file to show the results. This data file, called data.opi contains relevant and crucial information. When this is missing, the error referring to OPI will be shown.
This happens when trying to see results from e.g. PLAXIS 3DFoundation, PLAXIS-GiD and PlaxFlow.

UNSUPPORTED

This error will be shown for projects and data that is not properly recognized.

Solution for seeing older results

In order to view results made with an older version that is no longer supported by this version’s Output program, please use that older version. You can obtain such an older Output version in several ways:

  • in most cases, Plaxis installs an older Output version in the Plaxis installation folder. Start this older PLAXIS Output version from the PLAXIS installation folder (when present) by double clicking the program file and then open the results.
    • You can find these called e.g. Plaxis3DOutput_2012.02.exe for PLAXIS 3D2012.
    • During the installation of PLAXIS 2D AE, PLAXIS 2D Classic will be installed alongside it. In order to launch PLAXIS 2D Classic separately, you will find a folder called Classic in the PLAXIS 2D AE Installation folder (e.g. C:\Program Files (x86)\Plaxis\PLAXIS 2D\Classic). In this folder you will find a fully functioning copy of PLAXIS 2D Classic. This version's Output is called PlaxOut.exe and can be used to view results from 2D Version 8, 9, 2010, 2011 and 2012
  • or downgrading the current PLAXIS version via PLAXIS Connect,
  • for PLAXIS versions starting from PLAXIS 2D 2015 and PLAXIS 3D AE (2015), special free viewers are available. Please see the related article about the Plaxis Viewer - standalone program to view results
  • for older versions, download the Output version from the attached file links below. Make sure to copy the downloaded file to the PLAXIS installation folder

Related articles

Downloads

Plaxis3DOutput_2012.02.exeCan be used to show results for PLAXIS 3D2011, PLAXIS 3D2012 and 3DFoundation V2.2, and when OLD_VERSION gives CODE 0exe| 4.57 MB
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Structural tables for a safety value show no values in PLAXIS 2D 2016.00

April 4, 2016, 12:27 am
$
0
0
Application:
PLAXIS 2D 2016.00
Known Issue ID:
5154

Problem description

When accessing the table data for any structural element (plate, geogrid, embedded beam row, Fixed end anchor, none-to-node anchor) in a Safety phase, all values in the table show a N/A value. This is due to an issue in the Output program’s table rendering.

Force results show N/A in a safety analysis

Figure 1. Force results show N/A in a safety analysis

This also affects the getresults command for Output’s command line and the remote scripting (Python), in which the getresults gives this message when retrieving structural elements data for a Safety phase (note: it works for other calculation types):

The command did not deliver any results

The structural displacements and forces are still calculated correctly during the Safety’s deformation calculation, but the results are just not accessible in the Output program.

Solution

We are working on a solution for this problem for the next update.

There is one workaround available, that uses the curves feature in Output with post-calculation selected nodes.

Node to node anchor

These steps should be followed to get the force for a node-to-node anchor:

  1. Open the Output results of the safety phase
  2. Note the step number of this phase, since we will need it later to read the results from a curve
  3. Locate the two endpoint coordinates of the desired node to node anchor
  4. Now open the curves manager
  5. In the third tab sheet (Select points) fill in the coordinates of one of the two end points
  6. One of the items in the lower pane, should read Node-to-node anchor. Select this one. Select a post-calculation node for curves for a Node-to-node anchor
  7. If this node is not found, use the other end point’s coordinates
  8. Now make a graph of step vs. Axial force for this node
  9. You can open the table and find the appropriate step to read the exact anchor’s axial force

Example:

Unable to display content. Adobe Flash is required.

 

For other structural elements, you can use the same approach by selecting node after calculation.

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