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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.

Pre-Deformed FE Mesh
Pre-Deformed FE Mesh
Events
2024-04-30
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Timber Design
2024-05-02
Construction Stages in Membrane Structures with RFEM 6
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Construction Stages in Membrane Structures with RFEM 6
2024-05-08
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Reinforced Concrete Design
2024-05-08
Cross-Section Modeling and \n Stress Analysis in RSECTION 1
EN-GB | Flag Webinar
Cross-Section Modeling and Stress Analysis in RSECTION 1
2024-05-15
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Steel Design
2024-05-16
Consideration of Construction Stages in RFEM 6
EN-GB | Flag Webinar
Consideration of Construction Stages in RFEM 6
2024-05-23
Most Frequently Asked Questions Answered by Dlubal Support Team
EN-GB | Flag Webinar
Most Frequently Asked Questions Answered by Dlubal Support Team | May 2024
2024-05-29
Steel Structures in RFEM 6 \n Part 1: Modeling, Load Input
EN-GB | Flag Webinar
Modeling and Design of Steel Structures in RFEM 6 | Part 1: Modeling, Load Input
2024-06-06
Steel Structures in RFEM 6 \n Part 2: Combinations, Design, Documentation
EN-GB | Flag Webinar
Modeling and Design of Steel Structures in RFEM 6 | Part 2: Combinations, Design, Documentation
2024-06-20
Most Frequently Asked Questions Answered by Dlubal Support Team
EN-GB | Flag Webinar
Most Frequently Asked Questions Answered by Dlubal Support Team | June 2024
2024-10-16
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Member Design
2024-10-23
Online Training | English
EN-GB | Flag Online Training
RSECTION 1 | Students | Introduction to Strength of Materials
Videos
FAQ|004914
EN-US | Flag FAQ
[EN] FAQ 004914 | How can I create a drilled beam in RFEM?
Length: 00:01:33 min
FAQ|004480
EN-US | Flag FAQ
[EN] FAQ 004480 | I have calculated a pre-deformed structure according to the second-order analysis ...
Length: 00:02:14 min
FAQ|002255
EN-US | Flag FAQ
[EN] FAQ 002255 | How can I perform a buckling analysis for a surface in RFEM?
Length: 00:01:00 min
EN-US | Flag Product Feature
Phase Sections in Construction Stages Analysis (CSA) Add-on
Length: 00:00:33 min
EN-US | Flag Product Feature
Line Hinges for Rigid Links
Length: 00:00:41 min
EN-US | Flag Product Feature
Punching Shear Design for All Section Shapes
Length: 00:00:45 min
EN-US | Flag General
Dynamic and Seismic Analysis of Structures | RFEM 6 & RSTAB 9 by Dlubal Software
Length: 00:00:00 min
EN-US | Flag Event
Webinar | AISC 360-22 Steel Connection Design in RFEM 6
Length: 00:00:00 min
EN-US | Flag Event
RFEM 6 for Students | Introduction to FEM | Apr 24, 2024
Length: 00:00:00 min
Models to Download
Timber Pavilion Model in RFEM (© PIRMIN JUNG)
1286x
Timber Shell Made of CLT Panels
Design of Special Structures
858x
69x
Design of Special Structures | Graduation Thesis 000421
Advanced Steel
567x
40x
Webinar Advanced Steel
RF-IMP1
695x
32x
RF-IMP1
Cantilever Buckling
1774x
81x
Cantilever - Buckling
CLT Building
1577x
88x
Cross-Laminated Timber (CLT) Building
Model 004869 | Floor Panels for Multi-Story Structure
35x
2x
Floor panels for multi-storey construction
Model 004864 | Steel Structure Connection | AISC 360-22
81x
10x
Steel Structure Connection | AISC 360-22
Model 004865 | Multi-Story Building
58x
9x
Multi-storey building
Knowledge Base Articles
Local Effects with Regard to Load Introduction
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.
KB 001880 | Design of Cable Structures in RFEM 6 and RSTAB 9
In this article, you will learn how to model and design cable structures in RFEM 6 or RSTAB 9.
KB 001879 | Influence of Bending Stiffness of Cables
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.
KB 001877 | ASCE 7-22 and NBC 2020 Seismic P-Delta Considerations in RFEM 6
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.
Screenshots
Pre-Deformed FE Mesh
Pre-Deformed FE Mesh
Skylight Exterior View (© Bellapart)
Skylight Exterior View (© Bellapart)
Manually Drilled Beam
Manually Drilled Beam
Comparison of Results
Comparison of Results
Stress Analysis on Plate Structure of Member
Stress Analysis on Plate Structure of Member
Buckling Shape of Member as Plate Structure
Buckling Shape of Member as Plate Structure
Loading - Member as Plate Structure
Loading - Member as Plate Structure
Buckling of Cantilever 
Buckling of Cantilever with RF-IMP, Pre-Deformed Equivalent Model
Generation of Equivalent Geometric Imperfections and Pre-Deformed Initial Structures
RF-IMP/RSIMP Add-on Module | Generation of Equivalent Geometric Imperfections and Pre-Deformed Initial Structures
Product Features
Standards for Equivalent Imperfections

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:

  • European Union | Flag EN 1992:2004
  • European Union | Flag EN 1993:2005
  • DE | Flag DIN 18800:1990-11
  • DE | Flag DIN 1045-1:2001-07
  • DE | Flag 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.

Generation of Equivalent Geometric Imperfections and Pre-Deformed Initial Structures
  • 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
Equivalent Imperfection in Load Combination

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.

Pre-Deformed FE Mesh

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.

Frequently Asked Questions (FAQ)
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?
Which Dlubal software products do you recommend for the structural analysis and design of timber structures in particular?
Customer Projects
Skylight Exterior View (© Bellapart)
Skylight of the Ritz Hotel in Madrid, Spain
Exterior View of Pastry Production and Storage Unit | © GH HERVOUET
Creation of a production and storage facility for pastries in Montbert, France
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany | © Bruno Klomfar
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany
Lighted Toll Station | © Mr. Yunchao Ding, Jiangsu Jingong Space Structure Co., Ltd.
Dawang Toll Station in Shaanxi, China
RFEM Model of High-Bay Racking with Deformation Results
High-Bay Racking, China
Multi-Energy Station (© GH HERVOUET)
Multi-Energy Station in Les Sables-d'Olonne, France
Front View of Office Building with V-Shaped Steel Composite Columns | © Die Tragwerker GmbH
Office Building with Integrated Visitor Center and Parking Garage in Geiselbulach, Germany
Model of Gym | © BET Moselle Bois
Metz Gym as Showcase of Engineering and Sustainability in Modern Construction, Metz, France
Steel Pergola at Rafael Landívar University (© Eng. Enrique de León)
Steel Pergola in Plaza del Edificio L, Rafael Landívar University, Guatemala
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