- Creation of a pre-deformed FE mesh in RFEM
- Generation of equivalent imperfections of members as equivalent loads, considering
- the reduction factors αu and αm (Eurocode)
- the precamber rises according to buckling stress curves
- Deformation of the structure due to nodal displacement
- Generation of imperfections in accordance with:
- the load case deformations
- the buckling shapes from RF-STABILITY/RSBUCK
- Equivalent imperfections on members and sets of members (for example, columns consisting of several members)
- Visualization of generated imperfection modes
RF-IMP/RSIMP | Features
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As an alternative to the equivalent member method, this article describes the possibility to determine the internal forces of a wall at risk of buckling according to the second-order analysis, taking imperfections into account, and to subsequently perform the cross-section design for bending and compression.
In this article, you will learn how to model and design cable structures in RFEM 6 or RSTAB 9.
This article describes and explains the influence of bending stiffness of cables on their internal forces. Furthermore, the text provides information on how this influence can be reduced.
The ASCE 7-22 Standard [1], Sect. 12.9.1.6 specifies when P-delta effects should be considered when running a modal response spectrum analysis for seismic design. In the NBC 2020 [2], Sent. 4.1.8.3.8.c gives only a short requirement that sway effects due to the interaction of gravity loads with the deformed structure should be considered. Therefore, there may be situations where second-order effects, also known as P-delta, must be considered when carrying out a seismic analysis.
The add-on module evaluates the pre-deformation of a load case as well as mode shapes of stability or dynamic analysis. Based on this initial deformation, it is possible either to pre-deform the structure or to create a load case with equivalent imperfections of members.
The pre-deformed initial model is useful especially for structures consisting of surface and solid elements (RFEM) as well as members. It is necessary to specify only the maximum value to which the deformation is to be scaled. All FE or model nodes will be scaled with regard to the initial deformation.
Equivalent imperfections are particularly useful for beam structures. You can define inclinations and precambers of members and sets of members in the additional window. They can be generated automatically, according to standards, or defined manually. The following standards are available:
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EN 1992:2004 -
EN 1993:2005
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DIN 18800:1990-11 -
DIN 1045-1:2001-07
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DIN 1052:2004-08
Only the imperfection resulting from the initial deformation on the relevant member is applied. In addition, you can consider the reduction factors. This way, it is possible to apply the imperfection efficiently.
- Creation of a pre-deformed FE mesh in RFEM
- Generation of equivalent imperfections of members as equivalent loads, considering
- the reduction factors αu and αm (Eurocode)
- the precamber rises according to buckling stress curves
- Deformation of the structure due to nodal displacement
- Generation of imperfections in accordance with:
- the load case deformations
- the buckling shapes from RF-STABILITY/RSBUCK
- Equivalent imperfections on members and sets of members (for example, columns consisting of several members)
- Visualization of generated imperfection modes
This generation type creates a normal load case including imperfections. You can modify the load case manually.
In the load combinations, this load case can then be combined with the 'normal' load cases.
When generating a pre-deformed FE mesh in RFEM, the displacement data of each individual node are saved in the background. This can be used for the calculation of load combinations in RFEM. In order to check the generated data, the pre-deformation is displayed in tables and graphically.
If the nodes of the model are to be displaced, the node coordinates are modified directly after the generation. When generating equivalent imperfections, the module creates a normal load case, including member imperfections. To facilitate the data check, generated imperfections are displayed in result tables as well as graphically.
How can I create a drilled beam in RFEM?
I have calculated a pre-deformed structure according to the second-order analysis with RF‑STABILITY and RF‑IMP. Why are the deformations of the CO smaller than the applied pre-deformation?
How can I perform a buckling analysis for a surface in RFEM 5?
How can I perform a stability/buckling analysis on a plate structure?
I have to dimension a wall bracket as a steel brackets that I have modeled as surface components in RFEM 5. Which add-on module can I use to design it?
How do I reset the display settings to default?
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