ATENA v4 Technical specifications

ATENA Specifications - PDF version

ATENA v4 TECHNICAL SPECIFICATION

September 2010

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.

- Spring supports.

- External cable elements

- Interface, gap

Material Models

- 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.

- 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, user defined functions, variable parameters.

- Reinforcement bi-linear and multi-linear. Reinforcement with bond.

- Von Mises plasticity for metals.

- Drucker-Prager plasticity with associated / non-associated flow rule for rock and soil.

- Bazant M4 microplane concrete.

- Reinforcement cyclic.

- Interface with Mohr-Coulomb material law.

- Isotropic elastic.

- Non-linear springs.

- Temperature dependent (Fire)

- Creep and shrinkage (Bazant, Eurocode, ACI)

- Transport of heat

- Fatigue of concrete in tension

- User-supplied material subprogram

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 and sparse solver of equations. Eigenvalue.

- Newton-Raphson and modified Newton-Raphson.

- Arc-length. Line-search.

- Tangential and elastic stiffness predictors.

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).

- AtenaWin. General semi-graphical user interface for ATENA for solution and post-processing of 2D and 3D models. Requires input text files.

- GiD interface (GiD - general FE pre- and post-processor from CIMNE, Spain) with interface to ATENA.

Equipment

Minimum:                       PC with MS Windows XP SP2/W7/Vista SP1/2000 SP4 Rollup 1, 512 MB RAM memory (1GB for W7 and Vista) and 40 GB HDD, graphics resolution 1024x768.

Recommended:              MS Windows XP, 4GB RAM memory, 500 GB hard disk, graphics card with resolution of

1280x1024 and Open GL 3D hw-acceleration, designed for CAD (e.g., nVidia FX, ATI FireGL/FirePro).