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004199
2019-11-08

Question

How can I create an imperfection via the COM interface?

Answer:

An imperfection is considered as a load and is transferred via the interface of the load case. Provided that the interface to the model has already been imported, the interface to the loads (ILoads) followed by the interface to Load Case 1 (ILoadCase) will subsequently be imported, if it has already been created:

        '   set loadcases
        Dim iLoads As iLoads
        Set iLoads = model.GetLoads
        
        '   get load case
        Dim iLc1 As ILoadCase
        Set iLc1 = iLoads.GetLoadCase(1, AtNo)
        
        '   define imperfection
        Dim imperf As Imperfection
        imperf.Comment = "test"
        imperf.Direction = LocalZType
        imperf.Inclination = 200
        imperf.no = 1
        imperf.ObjectList = 1
        imperf.Precamber = 300
        imperf.PrecamberActivity = ActivityAccording_EN_1993_1_1
        
        '   set imperfection
        iLc1.PrepareModification
        iLc1.SetImperfection imperf
        iLc1.FinishModification

The data of the imperfection are then filled out first, here for Member 1, then transferred within the Prepare-/FinishModification block of the Interfaces load case.

Events
2024-04-24
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to FEM
2024-05-08
Online Training | English
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RFEM 6 | Students | Introduction to Reinforced Concrete Design
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
2024-11-13
Online Training | English
EN-GB | Flag Online Training
RFEM 6 | Students | Introduction to Reinforced Concrete Design
Videos
EN-US | Flag Product Feature
Punching Shear Design for All Section Shapes
Length: 00:00:00 min
FAQ 005472
EN-US | Flag FAQ
FAQ 005472 | In the table of the objects to be designed in the Concrete Design add-on, punching nodes are...
Length: 00:00:00 min
EN-US | Flag Product Feature
Automatic to Reach Specific Effective Modal Mass Factor
Length: 00:00:55 min
EN-US | Flag Product Feature
Info Bubbles for Line Supports
Length: 00:00:35 min
EN-US | Flag Event
Calculation of Reinforced Concrete Slabs in RFEM 6
Length: 01:09:36 min
EN-US | Flag Event
Webinar | Geotechnical Analysis in RFEM 6
Length: 01:04:37 min
FAQ 005434
EN-US | Flag FAQ
FAQ 005434 | I use a template for the data exchange with Revit or Rhino/Grasshopper, and get...
Length: 00:00:30 min
FAQ 005432
EN-US | Flag FAQ
FAQ 005432 | How can I set user-defined points for result values on surfaces in RFEM 6?
Length: 00:00:51 min
EN-US | Flag Event
RFEM 6 for Students | Introduction to Reinforced Concrete Design | November 23, 2023
Length: 01:00:25 min
Models to Download
Model 004852 | Pedestrian and Cyclist Bridge in Eichstätt, Germany
191x
Pedestrian and Cyclist Bridge in Eichstätt, Germany
Model 004849 | Concrete Bridge
177x
20x
Concrete Bridge
Model 004850 | Concrete Building
215x
17x
Concrete Building
Model 004822 | Angled Office Building
315x
62x
Angled Office Building
Model 004783 | Twin Pile Cap
339x
26x
Twin Pile Cap
Model 004784 | Triple Pile Cap
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22x
Triple Pile Cap
Model 004785 | Foundation Footing
355x
25x
Foundation Footing
Model 004786 | Office Building with Integrated Visitors' Center and Parking Garage in Geiselbulach, Germany
331x
Office Building with Integrated Visitor Center and Parking Garage in Geiselbulach, Germany
Model 004788 | Bleachers
270x
12x
Bleachers
Knowledge Base Articles
Design Level 1 - Ultimate Configuration
The fatigue design according to EN 1992-1-1 must be performed for the structural components subjected to large stress ranges and/or many load changes. In this case, the design checks for the concrete and the reinforcement are performed separately. There are two alternative design methods available.
Steel Fiber-Reinforced Concrete Slab
Using an example of a steel fiber-reinforced concrete slab, this article describes how the use of different integration methods and of a different number of integration points affects the calculation result.
KB 001858 | Wind Loads on Circular Dome Roof Structures According to ASCE 7-22
When it comes to wind loads on building type structures as per ASCE 7, numerous resources can be found to supplement design standards and aid engineers with this lateral load application. However, engineers may find it more difficult to find similar resources for wind loading on non-building type structures. This article will examine the steps to calculate and apply wind loads as per ASCE 7-22 on a circular reinforced concrete tank with a dome roof.
Spans Based on Figure 5.2 from [1]
In order to correctly design a downstand beam or a T-beam in RFEM 6 using the Concrete Design add-on, it is essential to determine the flange widths for the rib members. This article describes the input options for a two-span beam and the calculation of the flange dimensions according to EN 1992-1-1.
Screenshots
Results of Calculation with User-Defined Basic Control Perimeter Area
Results of Calculation with User-Defined Basic Control Perimeter Area
RFEM Model of Palazzo Meridia Office and Retail Building in Nice, France
RFEM Model of Palazzo Meridia Office and Retail Building in Nice, France | © Architecture-Studio
Model of Markas Headquarters, Italy
Model of Markas Headquarters, Italy | © ATP/Bause
Model of Storage Facility Construction with Deformation Results in RSTAB 9
Model of Storage Facility Construction with Deformation Results in RSTAB 9 | © SPIC SAS
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
RFEM Model of Pedestrian and Cyclist Bridge in Eichstätt, Germany | © Bergmeister Ingenieure
Model 004386 | Multistory Reinforced Concrete Building | CSA A23.3:19
Model 004386 | Multistory Reinforced Concrete Building | CSA A23.3:19
Design Level 2 – Design Setting
Design Level 2 – Design Setting
Design Level 1 – Design Setting
Design Level 1 – Design Setting
Product Features
Feature 002801 | Punching Shear Design for All Section Shapes

Do you have individual column sections and angled wall geometries, and need punching shear design for them?

No problem. In RFEM 6, you can perform punching shear design not only for rectangular and circular sections, but for any cross-section shape.

Feature 002722 | Sensitivity Coefficient

For a response spectrum analysis of building models, you can display the sensitivity coefficients for the horizontal directions by story.

These key figures allow you to interpret the sensitivity to stability effects.

Feature 002720 | Modal Relevance Factor for Stability Analysis

The modal relevance factor (MRF) can help you to assess to which extent specific elements participate in a specific mode shape. The calculation is based on the relative elastic deformation energy of each individual member.

The MRF can be used to distinguish between local and global mode shapes. If multiple individual members show significant MRF (for example, > 20%), the instability of the entire structure or a substructure is very likely. On the other hand, if the sum of all MRFs for an eigenmode is around 100%, a local stability phenomenon (for example, buckling of a single bar) can be expected.

Furthermore, the MRF can be used to determine critical loads and equivalent buckling lengths of certain members (for example, for stability design). Mode shapes for which a specific member has small MRF values (for example, < 20%) can be neglected in this context.

The MRF is displayed by mode shape in the result table under Stability Analysis → Results by Members → Effective Lengths and Critical Loads.

Feature 002721 | Component "Plate Cut"

You can use the "Plate Cut" component to cut plates (for example, gusset plates, fin plates, and so on). There are various cutting methods available:

  • Plane: The cut is performed on the closest surface to the reference plate.
  • Surface: Only the intersecting parts of plates are cut.
  • Bounding Box: The outermost dimension consisting of width and height is cut out of the plate as a rectangle.
  • Convex Envelope: The outer hull of the cross-section is used for the plate cut. If there are fillets at the corner nodes of the cross-section, the cut is adapted to them.
Frequently Asked Questions (FAQ)
How can I create an imperfection via the COM interface?
Which products do you recommend for the structural analysis and design of reinforced concrete structures?
In the table of the objects to be designed in the Concrete Design add-on, punching nodes are listed in the not valid/deactivated column, although I have defined them as punching nodes. How can I fix this?
How can I generate an area load on members via cells in RFEM 6 or RSTAB 9?
How can I use graphic templates for multi printing of a reinforcement?
I use a template for the data exchange with Revit or Rhino/Grasshopper, and get an error message.
Customer Projects
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany | © Bruno Klomfar
Pedestrian and Cyclist Bridge "Herzogsteg" in Eichstätt, Germany
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
Office Building of Stadtwerke Kirchheim unter Teck, Germany (Rendering) | © MEDIA 4D GmbH
Office Building of Stadtwerke Kirchheim unter Teck, Germany
Reinforced Concrete Elevator Shaft at Montluçon Station, France (© E.T.L Structures)
Reinforced Concrete Elevator Shaft at Montluçon Station, France
Quai M, the New Concert Hall in La Roche-sur-Yon, France (© LCA Construction Bois)
New Concert Hall in La Roche-sur-Yon, France
Residential Buildings in Trieste, Italy
Residential Buildings in Trieste, Italy
Deformations of Airedale Swing Bridge in RFEM
Airedale Swing Bridge in Rodley, United Kingdom
Deformations in RFEM | © Baumruck + Oswald
AQUAtherm Indoor/Outdoor Swimming Pool in Straubing, Germany
Pedestrian Bridge "Am Freischütz" over Federal Highway 236 | © VIC Planen und Beraten GmbH | Photo: René Legrand
Freischütz Pedestrian Bridge, Germany
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