RF-IMP: Generation of Equivalent Imperfections

Add-on Module for RFEM 5

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Add-on Module for RFEM 5
RF-IMP

The RF-IMP add-on module is used to automatically generate imperfections for geometrically nonlinear calculations.

During the calculation according to the second-order or large deformation analysis in RFEM 5, you can perform ultimate limit state design, including stability analysis. This applies not only to frame and truss structures, but also to models with shell and solid elements.

Generation of Pre-Deformed Initial Structures and Equivalent Imperfections for Nonlinear Analysis

Total items: 5

Generation of Equivalent Geometric Imperfections and Pre-Deformed Initial Structures

RF-/JOINTS Steel - SIKLA Add-on Module for RFEM/RSTAB | Design of Sikla Joints

RF-IMP/RSIMP | Features

Creation of a pre-deformed FE mesh in RFEM
Generation of equivalent imperfections of members as equivalent loads, considering
- the reduction factors α_u and α_m (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 | Input

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:

EN 1992:2004
EN 1993:2005
DIN 18800:1990-11
DIN 1045-1:2001-07
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.

RF-IMP/RSIMP | Generation

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.

RF-IMP/RSIMP | Using Pre-Deformed FE Mesh in RFEM

It is possible to use previously created pre-deformed FE mesh in load combinations. To do this, select the corresponding RF-IMP case in the calculation parameters of the load combination. Then, the calculation of internal forces is performed for the imperfect structure.

Equivalent Imperfection in Load Combination

RF-IMP/RSIMP | Using Equivalent Imperfections

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.

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900.00 USD

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Total Amount 900.00 USD

The price is valid for United States.

First Steps with RFEM 5

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Structural Analysis Models to Download

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