ATENA v5 Technical specifications

ATENA Specifications - PDF version

March 2017

FINITE ELEMENTS

  • 2D isoparametric elements, quadrilateral, triangular. Axisymmetrical elements.
  • 3D solid elements: tetrahedron, brick, wedge. Low- and high-order. Shells (layered). Beams (fiber). 
  • Truss elements for reinforcement. External cable elements.
  • Spring supports - point, line, surface.
  • Interface elements, 2D and 3D.

MATERIAL MODELS

  • 3D fracture-plastic concrete model based on Menetrey-Willam law: smeared cracks, fracture-energy based softening, Compression Field Theory, aggregate interlock in shear, non-associated plasticity, unloading direction, user defined functions, variable parameters.
  • 2D SBETA concrete model, also for high strength and SFRC: smeared cracks, crack-band, fracture-energy-based softening, Kupfer’s compressive failure, variable shear retention, strength reduction of cracked concrete.
  • Reinforcement bi-linear and multi-linear. Reinforcement with bond. Cyclic reinforcement (Menegotto-Pinto / Bauschinger effect) and bond.
  • Von Mises plasticity for metals.
  • Drucker-Prager plasticity with associated / non-associated flow rule for rock and soil.
  • Bazant M4 microplane concrete.
  • Interface with Mohr-Coulomb material law.
  • Isotropic elastic.
  • Non-linear springs.
  • Temperature dependent material properties (Fire loading).
  • Creep and shrinkage (Bazant, Eurocode, ACI)
  • Heat and moisture transport, hydration heat model CERHYD.
  • Fatigue of concrete in tension.
  • User-defined material model (user-compiled DLL in C/C++ or FORTRAN).

LOADING

  • Load cases: body forces, loading forces, supports, prescribed deformations, temperature, shrinkage, prestressing.
  • Load steps: combination of load cases, solution methods.
  • Arbitrary load history in steps, non-proportional, cyclic, dynamic.
  • Construction process.

SOLUTION METHODS

  • Direct band (skyline) and sparse iterative equation system solvers. Eigenvalues.
  • Newton-Raphson, modified Newton-Raphson, Arc-length. Line-search.
  • Tangential and elastic stiffness predictors.
  • Newmark and Hughes Alpha for dynamics.
  • 32 bit and 64 bit solution core.

GRAPHICAL USER ENVIRONMENT

  • 2D GUE. Graphical user environment: pre-processing (geometrical modeling, reinforcement (bars, smeared), automatic meshing, material properties, loading and supports, solution methods, monitoring), solution (non-linear FE solution, graphical monitoring, restart), post-processing (iso-lines, iso-areas, rendering, vectors, tensors, cracks, response diagrams, cuts/sections, internal forces (M, N, T), user-defined numerical output).
  • 3D GUE. Graphical user environment: pre-processing (geometrical modeling, reinforcement (bars, smeared), copy and move, automatic meshing, material properties, loading and supports, solution methods, monitoring), solution (direct or sparse iterative, graphical monitoring, restart), post-processing (iso-lines, iso-areas, rendering, vectors, tensors, cracks, response diagrams, cuts/sections, user-defined numerical output).
  • ATENA Studio. Graphical user interface for ATENA Science for solution and post-processing of 2D and 3D models.
  • GiD interface (GiD - general FE pre- and post-processor from CIMNE, Spain) with interface to ATENA.

SYSTEM REQUIREMENTS

Minimum
PC with MS Windows 7 SP2, 32bit, 2 GB RAM memory and 200 GB HDD, graphics card with OpenGL 1.1 and 1024x768 resolution. GiD 9.0.4 (8.2.0b) or later (for ATENA Sci/Full).

Recommended
PC with MS Windows 7, 64bit, 16 GB RAM memory, 2 TB hard disk, discrete graphics card with resolution of 1920x1080 and OpenGL 1.4 with 3D hw-acceleration, designed for CAD (e.g., nVidia FX, ATI FireGL/FirePro). GiD 64bit 10.0.9 or later (for ATENA Sci/Full).

 

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