To limit the deformations, the deflections must be determined realistically. The calculation method has to match the real structural behavior with an accuracy appropriate for the design purpose.
The Concrete Design add-on provides two methods for this, the "Direct Deformation Analysis" and the "Nonlinear Deformation Analysis". The procedure for both methods is summarized below.
Direct Deformation Analysis
- This solution is contained in the Concrete Design add-on.
- The finite element analysis is performed with linear elastic material behavior for reinforced concrete, whereby creep and shrinkage are activated in the material.
- The linear-elastic internal forces of the finite element analysis are transferred to the concrete design as input values.
- In the course of the concrete design, the direct deformation analysis in state II is carried out, taking into account the reinforcement as well as the creep and shrinkage. → The calculation is described in detail in the corresponding chapter Direct Deformation Analysis.
- Then, it is compared to the defined limit values.
Nonlinear Deformation Analysis
- This solution requires the Concrete Design and Nonlinear Material Behavior add-ons.
- The finite element analysis is performed with the nonlinear material behavior for the reinforced concrete, taking into account the reinforcement as well as the creep and shrinkage. --> The deformation calculation in state II is performed directly in the main program. The requirements for this are described in detail in Chapter Nonlinear Design.