The computer program IDARC 2D 2D was conceived as a platform for nonlinear structural analysis in which various aspects of concrete, steel and other materials behavior can be modeled, tested and improved upon. Program development and enhancements have been primarily to link experimental research and analytical developments.

The computer program IDARC 2D 2D was introduced in 1987 as a two-dimensional analysis program to study the non-linear response of multistory reinforced concrete buildings. The original program released included the following structural element types:

Column Elements
Beam Elements
Shear Wall Elements
Edge Column Elements
Transverse Beam Elements
Column elements were modeled considering macromodels with inelastic flexural deformations, and elastic shear and axial deformations. Beam elements are modeled using a nonlinear flexural stiffness model with linear elastic shear deformations considered. Shear wall include inelastic shear and bending deformations, with an uncoupled elastic axial component. Edge column elements were introduced considering only inelastic axial deformations. Transverse beam elements, that have an effect on the rotational deformation of the shear walls or beams to which they are connected, are modeled using elastic linear and rotational springs.