Back to Videos
Is this page helpful? 3x
1178x
002725
Dipl.-Ing. (BA) Andreas Niemeier, M.Eng.
2021-05-28

KB 000951 | Critical Load Factor

RFEM and RSTAB can calculate a critical load factor for each load case (LC) and each load combination (CO) in the case of a geometrically nonlinear calculation (second-order analysis and following).

Links
  • Mia: AI Assistant
  • Latest Videos
Events
Videos
Models to Download
Knowledge Base Articles
Model 1 Without Member Eccentricities
The beam is resting on the column, and the beam ends at the outer edge of the column. These requirements can be fulfilled easily in an architectural model with solids. In member analysis, simplified line models are used in which center lines meet in a common node. In this article, the influence of member eccentricities on the determination of internal forces is shown on three simple models.
Eccentricities
In the case of a parallel offset of the structural plane of members and surfaces and also applying an axial offset to members, for example, the function of eccentricities may be useful.
Member Hinge Locations of Member Eccentricity
When modeling eccentric members with member hinges, RFEM provides the option to assign the hinge to the start or end of the member eccentricity. There is another option for creating and displaying the structural system more precisely in the design.
Defining Eccentricity of Base Plate in RF-/JOINTS Steel - Column Base
For structural reasons, it may be necessary for a base plate not to be set centrically on a foundation. Therefore, an eccentric arrangement of the base plate is possible in RF‑/JOINTS Steel - Column Base by entering the parameters for the respective direction in Window 1.4.
Screenshots
Product Features
Feature 002443 | Control of Crack Condition for Deformation and Crack Width Analysis

Various design parameters of the cross-sections can be adjusted in the serviceability limit state configuration. The applied cross-section condition for the deformation and crack width analysis can be controlled there.

For this, the following settings can be activated:

  • Crack state calculated from associated load
  • Crack state determined as an envelope from all SLS design situations
  • Cracked state of cross-section - independent of load
Feature 002415 | Improved Segmentation for Deformation Analysis

In the "Deflection and Design Support" tab under "Edit Member", the members can be clearly segmented using optimized input windows. Depending on the supports, the deformation limits for cantilever beams or single-span beams are used automatically.

By defining the design support in the corresponding direction at the member start, member end, and intermediate nodes, the program automatically recognizes the segments and segment lengths to which the allowable deformation is related. It also automatically detects whether it is a beam or a cantilever due to the defined design supports. The manual assignment, as in the previous versions (RFEM 5), is no longer necessary.

The "User-Defined Lengths" option allows you to modify the reference lengths in the table. The corresponding segment length is always used by default. If the reference length deviates from the segment length (for example, in the case of curved members), it can be adjusted.

Feature 002416 | Result Display via Clipping Plane

This feature also contributes to the clearly-arranged display of your results. Clipping planes are intersecting planes that you can place freely throughout the model. The zone in front of or behind the plane is consequently hidden in the display. This way, you can clearly and simply show the results in an intersection or a solid, for example.

Feature 002423 | Displaying Results in Solids

The results of solid stresses can be displayed as colored 3D points in the finite elements.

Frequently Asked Questions (FAQ)
How can I assign a common eccentricity to several different cross-sections at once?
Does RFEM recognize that a member is connected to a surface despite the eccentricity?
Why does an eccentric member receive axial forces, although it is only loaded by shear forces?
How can I create member eccentricities in RS‑COM?
Why is it not possible to define eccentricity in the Z‑direction in my 2D model?
In RSTAB, how can I select the side of eccentrically connected members on which the hinge is effective?
Customer Projects
Recommended Products for You
Display Product Family