ATENA — Features

2D isoparametric elements, quadrilateral, triangular,aAxisymmetrical elements
3D solid elements: tetrahedron, brick, wedge; low- and high-order. Shells (layered), and Beams (fiber)
1D fiber beam elements and 2D layered shell/plate elements.
Truss elements for reinforcement. External cable elements.
Spring supports - point, line, surface.
Interface elements, 2D and 3D.

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, fiber-reinforced concrete (FRC, UHPFRC, SHCC, ECC).
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/M7 microplane concrete
Interface with Mohr-Coulomb material law
Isotropic elastic
Non-linear springs
Temperature dependent material properties (Fire loading)
Creep and shrinkage (Bazant B3, 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).

Direct band (skyline), PARDISO, 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

2D GUE: pre-processing [geometrical modeling, reinforcement (discrete bars, smeared), automatic meshing , material properties, loading and supports, solution methods, monitoring], solution (nonlinear 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 (discrete 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.

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 or later (for ATENA SCI/FULL).
Recommended: PC with MS Windows 7 SP2, 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 9.0.4 or later (for ATENA SCI/FULL).