DIANA is a well proven and tested software package with a reputation for handling difficult technical problems relating to design and assessment activities in concrete, steel, soil, rock and soil-structure interaction. The program's robust functionality includes extensive

material, element and procedure libraries based on advanced database techniques, linear and non-linear capabilities, full 2D and 3D modeling features and tools for CAD interoperability. With the continuous demand for more efficient utilization of resources and materials, together with the increasingly complex nature of engineering structures, DIANA is becoming the software of choice for gaining a competitive advantage when tackling design and assessment work.
DIANA (Displacement Analyzer) is a multipurpose finite element program, with especial strength in the field of civil engineering. DIANA development started in 1972 at the TNO Building and Construction Research Institute in The Netherlands. In 2003 TNO DIANA BV was established from the Computational Mechanics Department of TNO. TNO DIANA BV continues to develop market and support DIANA and undertakes customization, consultancy and client training activities on behalf of customers worldwide.

TNO DIANA Product Philosophy

With DIANA we offer a powerful tool that allows the expert analyst engineer to solve the most complex problems in the field of civil engineering. DIANA is based on an “all-in-one” strategy which grants the user complete freedom in the level of detailing and complexity of modeling, from concrete cracking to soil plasticity and from non-linear dynamics to coupled flow-stress analysis. For more common engineering design problems we have created, in partnership with Midas IT, an intuitive suite of application oriented products able to serve engineers throughout the entire civil engineering community.

Analysis Types

The main analysis features offered are:

• Linear static analysis
• Non linear analysis
• Potential flow analysis
• Coupled flow-stress analysis
• Dynamic analysis
• Phased analysis
• Euler stability analysis
• Parameter estimation

Solution Procedures

DIANA offers also powerful solution procedures. Main functionalities include:

• Direct and iterative solvers
• Automatic load and time stepping
• Several incremental-iterative methods (Newton-Raphson, Secant stiffness, Constant stiffness)
• Continuation methods and line search technique
• Automatic sub-structuring

Fully Integrated Pre- and Post-Processing

DIANA is fully integrated with iDIANA for:

• Model building
• Mesh generation
• CAD import
• Analysis specification
• Results viewing and graphics
• Animation
• Post-analysis calculation

Material Models

• Elasticity
• Cracking models
• Plasticity
• Soil specials
• Viscoleasticity
• Interface non linear models
• Temperature or concentration dependent material parameters
• Viscoplasticity
• Hyperelasticity