The nonlinear system analysis expansion module makes determining the internal force and deformation values possible for 2D and 3D frameworks made of reinforced concrete and steel under consideration of geometrical and physical nonlinearities and is especially suited for checking the ultimate limit state (buckling safety check) and the serviceability (deformations, internal forces) of the entire system.

The following nonlinear effects can also be taken into consideration:

• Equilibrium on the deformed system according to deflection theory or advanced geometrical nonlinear theory
• Beams made of reinforced concrete with stress-strain curve according to DIN 1045, DIN 1045-1, ÖNORM B 4700, SIA 262 and EN 1992-1-1
• Beams made of steel with bilinear stress-strain curve under consideration of the Huber-von Mises yield criterion and complete interaction with all internal forces
• Beams with bilinear stress-strain curve and individually definable compressive and tensile strength
• Beam bedding with bilinear bedding curve perpendicular to and alongside the beam.

3D reinforced concrete column with reinforcement distribution according to buckling safety check

Structures Made of Reinforced Concrete Depending on the material selected, the stress-strain curves for nonlinear internal force calculation are applied according to the applicable standard. The corresponding material partial safety factors are also taken into consideration. If desired, the reinforcement can be automatically increased, so as to achieve the desired structural safety or to comply with the permitted strain. The serviceability check can be carried out under consideration of the concrete tensile strength with softening or with bilinear characteristics in the tensile section.

Structures Made of Steel

The analysis is performed according to the yield-zone theory by using the plastic load-bearing capacity of the sections. The check guarantees that, under the consideration of the internal force interaction, the full-plastic internal force limits are not exceeded and that the system is in a stable state of equilibrium. In addition to the internal forces and deformations, the nonlinear stress distribution in the complete structure is made available.

Normal tension distribution on selected elements of a steel hall

  
Partially plasticized section

See also: Nonlinear system analysis for shell structures