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2024-02-20

How can the consideration of initial rotational stiffness in steel joints impact the results of a steel frame?

Unlock the secrets of steel frame design by exploring the impact of initial rotational stiffness in connections! 💡 Discover how subtle changes influence performance in a simplified frame under horizontal and vertical loads.

Precision meets innovation as we enhance beam-column joints with calculated spring constants, creating realistic connections using RFEM 6 by Dlubal Software and the Steel Joints add-on.

📊 Our focus: a detailed comparison of deflections with and without hinges in both horizontal and vertical loading scenarios. Dive deeper into the analysis by examining bending moments in frame corners under vertical loads.

Utilizing the Stiffness Analysis in Steel Joints, we calculate initial rotational stiffness directly in the structural model. These values become spring constants, elevating the accuracy of our model.

Curious to learn more?

Consideration of Initial Rotational Stiffness in Steel Joints
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
EN-GB | Flag Webinar
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 005494 | How can I model a timber beam with stiffening on both sides? (splice)
EN-US | Flag FAQ
FAQ 005494 | How can I model a timber beam with stiffening on both sides? (splice)
Length: 00:01:22 min
WIN | 04/2024 – What's New in RFEM 6 and RSTAB 9?
EN-US | Flag General
WIN | 04/2024 – What's New in RFEM 6 and RSTAB 9?
Length: 00:02:00 min
Most Frequently Asked Questions Answered by Dlubal Support Team | April 2024
EN-US | Flag Event
Webinar | Most Frequently Asked Questions Answered by Dlubal Support Team | April 2024
Length: 00:00:00 min
EN-US | Flag Event
RFEM 6 | Students | Introduction to Member Design
Length: 00:00:00 min
FAQ|005477
EN-US | Flag FAQ
FAQ 005477 | The calculation in RFEM 6 takes a very long time, but the processor utilization of my…
Length: 00:00:15 min
EN-US | Flag Product Feature
Mia – Your AI Assistant for Structural Analysis and Dlubal Software
Length: 00:01:26 min
EN-US | Flag Event
Webinar | Linear Stability Analysis in RFEM 6 and RSTAB 9
Length: 01:40:19 min
EN-US | Flag Event
Webinar | Advanced Structural Analysis with RFEM 6 Python API
Length: 00:51:43 min
WIN | 03/2024 – What's New in RFEM 6 and RSTAB 9?
EN-US | Flag General
WIN | 03/2024 – What's New in RFEM 6 and RSTAB 9?
Length: 00:01:52 min
Models to Download
Single-Span Beam for Fiber-Reinforced Concrete Design
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Single-Span Beam with Fiber-Reinforced Concrete as Surface Component or Frame Structure
FAQ 005401 | How do I use the "Import Support Reaction" load wizard?
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Foundation Slab
FAQ 005401 | How do I use the "Import Support Reaction" load wizard?
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20x
Concrete Building
Model 004376 | Precamber
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Precamber
Model 004351 | Tilting Cube
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Tilting Cube
Girder Grillage
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Girder Grillage
Model 004061 | Flat Roof Hall Made of Steel
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Flat Roof Hall Made of Steel
Model 004060 | Flat Roof Hall Made of Steel
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Flat Roof Hall Made of Steel
Steel Hall
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Analysis of Steel Structures in RFEM 6 | Steel Hall
Knowledge Base Articles
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.
Building Overview (KB1866)
To evaluate whether it is also necessary to consider the second-order analysis in a dynamic calculation, the sensitivity coefficient of interstory drift θ is provided in EN 1998‑1, Sections 2.2.2 and 4.4.2.2. It can be calculated and analyzed using RFEM 6 and RSTAB 9.
The coefficient θ is calculated as follows:$$\mathrm\theta\;=\;\frac{\displaystyle{\mathrm P}_\mathrm{tot}\;\cdot\;{\mathrm d}_\mathrm r}{{\mathrm V}_\mathrm{tot}\;\cdot\;\mathrm h}\;$$
Reduction of Building to Cantilever Structure The individual mass points represent stories. The deflection due to the normal compression forces shown in (a) is (b) converted into equivalent moments of displacement or shear forces (KB1867)
For the ultimate limit state design, EN 1998‑1, Sections 2.2.2 and 4.4.2.2 require a calculation considering the second‑order theory (P‑Δ effect). This effect may be neglected only if the interstory drift sensitivity coefficient θ is less than 0.1.
Screenshots
Assigning Static Analysis Setting (SA)
Assigning Static Analysis Setting (SA)
Editing Static Analysis Settings
Editing Static Analysis Settings
Static Analysis Settings in Navigator
Static Analysis Settings in Navigator
KB 001879 | Influence of Bending Stiffness of Cables
KB 001879 | Influence of Bending Stiffness of Cables
KB 001880 | Design of Cable Structures in RFEM 6 and RSTAB 9
KB 001880 | Cable Material Library
KB 001880 | Design of Cable Structures in RFEM 6 and RSTAB 9
KB 001880 | Cable Cross-Section Library
Plastic Hinge Properties
Plastic Hinge Properties
Options for Plastic Hinge Properties
Options for Plastic Hinge Properties
Dialog Box "Edit Design Support"  
Dialog Box "Edit Design Support"
Product Features
Feature 002807 | 3D Display of FSM Results

In the "Edit Section" dialog box, you can display the buckling shapes of the Finite Strip Method (FSM) as a 3D graphic.

Feature 002806 | Visual Objects

In RFEM 6 and RSTAB 9, you have the option to enter "Visual Objects" as guide objects. You can import the file formats 3ds, stl, and obj.

These objects allow you to create a better reference to the dimensions.

Feature 002793 | Mia, AI Assistant in RFEM

Mia is accessible in the programs and prevents the hassle of following up by email or phone.

Feature 002794 | "Dashpot" Member Type

Using the "Damper" member type, you can define a damping coefficient, a spring constant, and a mass. This member type extends the possibilities within the Time History Analysis.

With regard to viscoelasticity, the "Damper" member type is similar to the Kelvin-Voigt model, which consists of the damping element and an elastic spring (both connected in parallel).

Frequently Asked Questions (FAQ)
Which Dlubal software products do you recommend for the structural analysis and design of timber structures in particular?
How do I reset the display settings to default?
Why are the maximum deformations not displayed?
How many updates does Dlubal provide for RFEM 6 / RSTAB 9 each month?
Where in RFEM 6 can I find the calculation parameters?
How can I model a timber beam with stiffening on both sides? (splice)
Customer Projects
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
Radar Tower on Left (© SAQQARA Ingeniería)
Structural Analysis of Radar Tower at Malaga Airport, Spain