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, 64bit, 6 GB RAM memory and 256 GB HDD, graphics card with OpenGL 1.1 and 1024x768 resolution. GiD 14 or higher (for ATENA Sci/Full).
Recommended
PC with MS Windows 10, 64bit, 32 GB RAM memory, 4 TB hard disk, discrete graphics card with resolution of 1920x1080 and OpenGL 1.4 with 3D hw-acceleration, designed for CAD (e.g., nVidia - Quadro, AMD - Radeon Pro). GiD 64bit 14 or higher (for ATENA Sci/Full).
