For deflection control, it is necessary to determine deflections realistically. The calculation method should reflect the actual behavior of the structure with an accuracy appropriate for the design purpose.
The concrete design add-on provides two methods for this: “Direct Deformation Analysis” and “Nonlinear Deformation Analysis.” The procedure for both methods is briefly summarized below.
Direct Deformation Analysis
- This solution is included in the Concrete Design add-on.
- The finite element analysis is performed with linear elastic material behavior for reinforced concrete, whereby creep and shrinkage in the material are activated.
- The linear elastic internal forces from the finite element analysis are transferred to the Concrete Design as input values.
- During the concrete design, the direct deformation analysis is performed in state II, taking into account the reinforcement as well as creep and shrinkage. -> The calculation for this is described in detail in the corresponding chapter Direct Deformation Analysis.
- This is followed by a comparison with 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 nonlinear material behavior for reinforced concrete, taking into account reinforcement as well as creep and shrinkage. -> The deformation analysis in state II is performed directly in the main program. The requirements for this are described in detail in the chapter Nonlinear Design.