ATENA version 5.4

ATENA version 5.4

brings many new and exciting features mainly to increase the support for modeling practical problems in bridge engineering or to improve the support for large scale models.

The main new features are:

  • new finite elements for 2D shells and 1D beams
  • diagrams for internal forces, moment, shear, normal and torsion are available also for solid continuum elements
  • visualization diagram for 1D elements, for instance reinforcement stresses, bond stresses or bond slip
  • user friendly, accurate and realistic modeling of pre-stressing losses
  • loads can be applied at arbitrary locations
  • user defined view can be created, stored and shared among various projects
  •  new tutorial problems and manuals for selected problem types:
    • fiber reinforced concrete: FRC, EEC, SHCC, HPFRC, UHPFRC
    • strengthening by carbon fiber rods, lamellas or sheets
    • construction process modeling

The new version brings many new and exciting features based on the suggestion and feedback of our ATENA users.

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Fig. 1: Design of TBM lining from FRC tubings for Ejpovice railway tunnel was supported by ATENA

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Fig. 2: Crack development in the analysis of FRC tunnel
tubbing

New finite elements:

ATENA now supports also classical 1D beam and 2D shell elements (Fig 3 and 5). ATENA was always a specialized software for detailed reinforced concrete analysis. As such the emphasis was always on 2D/3D analysis using continuum based elements, which were enhanced by our specialized 3D beam and shell elements. ATENA users, however, want to apply nonlinear analysis to large scale structural problems, when classical beam and shell elements provide an efficient option.
They are formulated as fiber beam elements and layered shells that can be easily combined with full continuum based 2D/3D elements. In this way efficient models for large scale structures can be created, while preserving the option to model critical structural details with full continuum three-dimensional based models.

New features in ATENA Studio:

ATENA Studio is our unique software, where our users can immediately see how the structure responds to applied actions. Our unique run-time and post-processing system is now enhanced by the following features:
- Evolution diagrams of reinforcement quantities such as stresses, strains, etc (Fig. 4).
- Calculation and visualization of internal forces (see Fig. 6, i.e. moments, torsion or shear forces, for beam/shell elements as well as for continuum based elements. This greatly simplifies the application in design or assessment of existing structures
- User defined views and visualization parameters can be saved and shared among various ATENA Studio projects

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     Fig. 3: Example of thermal load on RC frame building
     due to sun radiation and resulting slab cracking, slabs
     are modeled with shell elements

 

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Fig. 4: Top - evolution of prestressing with losses, Bott.
- internal crack development and tendon stresses before failure

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Fig. 5: Building model using 2D shell and 1D beam elements showing the moment development in the columns

 

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Fig. 6: Concrete cracking above the main support,
moment evolution and deflection of a composite
steel-concrete bridge analyzed by ATENA

 

New modelling of pre-stressing losses:

The improved bond model enables very accurate and detailed modeling of pre-stressing losses due to friction and cohesion in tendon pipes as well as the subsequent tendon grouting with increased bond properties (see Fig. 4). Bond model can be activated in ATENA just by a single mouse click, no need for special interface elements or other complicated modeling tricks.

Loads at arbitrary locations:

Loads can be now applied at arbitrary locations, i.e. at point, lines or surfaces that do not need to be part of any geometric entity. This new feature greatly simplifies the application of complex loading patterns or moving loads.

New tutorials:

Several new tutorials have been developed and are available for download. They provide a step by step guidance in some of the typical ATENA application areas:
Tutorial for ATENA Science GiD FRC
- Analysis of fiber reinforced concrete structures, where one of the main problems the user typically need to solve is the proper definition of the fiber reinforced concrete material parameters. This process typically involves an inverse analysis of standard material tests. This process is in detail described in this tutorial with an application to segmental tunnel lining.
Tutorial for ATENA Science GiD Strengthening
- Strengthening by carbon fiber rods, lamellas or sheets is another application domain, where simulation with ATENA can be extremely useful. There are 4 possible approaches in ATENA for these problems, and this manual provides a step by step guidance and hands-on experience (Fig. 8).

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     Fig. 7: Process of FRC material model parameter
     identification

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Fig. 8: Failure of a model strengthened by FRP fabric

Tutorial for ATENA Science GiD Construction Process
- Construction process involves changing of structural geometry or properties during the construction. ATENA simulation system allows changes both in geometry, loads, boundary conditions as well as material properties at any time during  the analysis.

The first tutorial covers the application area of bridge construction. ATENA however supports also the modelling of tunnel construction process. This tutorial is currently under preparation and will be released before the end of the year. Please follow the download section on our website to learn about the new tutorials as they will be released.

Maintenance and support

We strongly support our users in their analytic work with ATENA. Support is mainly provided by email and phone calls. The solution to many questions can be found also in our FAQ & Online Forum. New versions of ATENA are released every year.

Maintenance is provided for free for one year after the software purchase. After that is it can be prolonged at annual rate coresponding to 15% of the program price.

  • System requirements

    • Minimum: PC with MS Windows XP SP2 / Windows Vista SP1, 512 MB RAM, 40 GB HDD, GPU with OpenGL 1.1 and 1024x768 resolution.
    • Recommended: PC with MS Windows 7, 64 bit 8 GB RAM, 500 GB HDD, GPU with OpenGL and HW acceleration, designed for CAD (nVidia FX, AMD FireGL, etc.)


    Full product specifiaction & system requirements

 

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