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Useful Program Features
Dlubal Software programs and add-on modules include a wide range of powerful features. In addition to product features, you can find here technical articles and application examples.
Furthermore, this overview provides you with several handy tips and tricks for your work with RFEM and RSTAB.
Why Dlubal Software?
Nonlinear Analysis in RF-/CONCRETE
When designing reinforced concrete components according to EN 1992‑1‑1 , it is possible to use nonlinear calculation methods to determine internal forces for the ultimate limit state and the serviceability limit state. In this case, the internal forces and deformations are determined with respect to their nonlinear behaviour. The analysis of stresses and strains in cracked state usually provides the deflections, which clearly exceed the linearly determined values.
Redistributing Shear Stresses from Null Elements
SHAPE-THIN allows you to calculate section properties and stresses of any cross‑sections. If a flange or a web is weakened by bolt holes, you can consider this by using null elements. The stresses are subsequently recalculated with the reduced cross‑section values. In this case, it is necessary to pay special attention to shear stresses. By default, these are set to zero in the area of the null elements. When recalculating shear stresses with the reduced cross‑section values and without further adaptation, it turns out that the integral of the shear stresses is no longer equal to the applied shear force. The following example shows in detail how to calculate the shear stress.
Imperfections According to EN 1993-1-1 Clause 5.3.2: Bow Imperfection
According to EN 1993‑1‑1 , it is necessary to use the equivalent geometric imperfections with values that reflect the possible effects of all types of imperfections. EN 1993‑1‑1, Clause 5.3, specifies basic imperfections for the global analysis of frames as well as member imperfections.
Generating Wind Loads on Walls and Roofs According to ASCE/SEI 7-16
RFEM and RSTAB allow you to easily consider wind load effects on a three-dimensional building according to ASCE/SEI 7‑16 . This article explains the complex theory of entering wind loads in the software. You can find the wind load under 'Tools' → 'Generate Loads' → 'From Wind Loads'.
Cutting Pattern of Membranes and Cable Elements
Cable and tensile membrane structures are regarded as very slender and aesthetic building constructions. The partly very complex double-curved shapes can be found using suitable form-finding algorithms. A possible solution is, for example, to search the form via the equilibrium between the surface stress (provided prestress and an additional load such as self-weight, pressure, etc.) and the given boundary conditions.
RF-/STEEL AISC Mode Shapes
After running an analysis in RF-/STEEL AISC, the mode shapes for sets of members can be viewed graphically in a separate window. Select the relevant set of members in the result window and click the [Mode Shapes] button.
Displaying Curtailment of Longitudinal Reinforcement and Reinforcement Covering Line
In the case of a huge amount of reinforcement, it might be useful to grade the longitudinal reinforcement of a beam. The grading corresponds to the tensile force distribution. Using RF-CONCRETE Members and CONCRETE, you can specify the curtailment of the reinforcement, which is considered in the automatically proposed reinforcement for the longitudinal reinforcement. When determining this reinforcement proposal, it is necessary to ensure that the envelope of the acting tensile force can be absorbed.
Visual Model Check Using Print to 3D PDF
The 3D PDF functionality allows you to display three-dimensional models from RFEM or RSTAB in a 3D PDF.
Downstand Beams, Ribs, T-Beams: Deformation and Deflection in Cracked State
RFEM and the RF-CONCRETE add-on modules provide various options for the deformation analysis of a T-beam in cracked state (state II). This technical article describes the calculation methods (C) and modelling options (M). Both the calculation methods and the modelling options are not limited to T-beams, but will only be explained using an example of this system.
Hardening Parameters in Nonlinear Material Models
Strain hardening is the material ability to reach a higher stiffness by redistributing (stretching) microcrystals in the crystal lattice of the structure. A distinction is made between the material isotropic hardening as scalar quantities or tensorial kinematic hardening.
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