8764x

Dipl.-Ing. (BA) Andreas Niemeier, M.Eng.

2021-01-26

Simulation of Thermal Strains with Specification of Absolute Temperatures

The RFEM and RSTAB structural analysis programs are able to simulate a thermal strain of structural components by means of temperature loads.

Since a global component temperature change has a membrane effect and a temperature change over the component height has a bending effect, the temperature load is defined in two parts in the load dialog box:

Uniform temperature T_c along the member axis x (membrane effect)
Non-uniform temperature ΔT for the y- or z-axis (bending effect)

If the thermal expansion is described by means of component surface temperatures in the examined practical case, the absolute temperature data can be converted to the sought temperature change and temperature difference as follows:

T_{c} = \frac{T_{o} + T_{u}}{2} - T_{r e f}

T_c	Temperature change
T_o	Temperature on the component surface
T_u	Temperature on the bottom surface of the component
T_ref	Reference temperature - mounting temperature

Temperature Change

Δ T = T_{o} - T_{u}

ΔT	Temperature gradient
T_o	Temperature on the component surface
T_u	Temperature on the bottom surface of the component

Temperature Gradient

Temperature-Loaded Steel Cantilever

Author

Mr. Niemeier is responsible for the development of RFEM, RSTAB, RWIND Simulation, and in the area of membrane structures. He is also responsible for quality assurance and customer support.

Links

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Events

2024-04-24

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RFEM 6 | Students | Introduction to FEM

2024-04-25

Stiffening Design in RFEM 6 Using Building Model

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Stiffening Design in RFEM 6 Using Building Model

2024-04-25

AISC 360-22 Steel Connection Design in RFEM 6

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AISC 360-22 Steel Connection Design in RFEM 6 (USA)

2024-04-30

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

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RFEM 6 | Students | Introduction to Reinforced Concrete Design

2024-05-08

$Cross-Section Modeling and \n Stress Analysis in RSECTION 1$

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Cross-Section Modeling and Stress Analysis in RSECTION 1

2024-05-15

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RFEM 6 | Students | Introduction to Steel Design

2024-05-16

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Most Frequently Asked Questions Answered by Dlubal Support Team

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2024-05-29

$Steel Structures in RFEM 6 \n Part 1: Modeling, Load Input$

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Modeling and Design of Steel Structures in RFEM 6 | Part 1: Modeling, Load Input

2024-06-06

$Steel Structures in RFEM 6 \n Part 2: Combinations, Design, Documentation$

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Modeling and Design of Steel Structures in RFEM 6 | Part 2: Combinations, Design, Documentation

Videos

Knowledge Base

KB 000478 | Simulation of Thermal Strains with Specification of Absolute Temperatures

Length: 00:00:54 min

Knowledge Base

KB 001264 | 2018 NDS Timber Column Design in RFEM 6

Length: 00:00:00 min

General

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Models to Download

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Temperature-Loaded Steel Cantilever

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319x

Steel Hall

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131x

Example of Concrete

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Reinforced Concrete Building

KB 001848 | Timber Column Design as per the 2018 NDS Standard in RFEM 6

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Timber Column for KB 1884

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Steel Member RSA | ASCE 7 and NBC

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Knowledge Base Articles

Using the Timber Design add-on, timber column design is possible according to the 2018 NDS standard ASD method. Accurately calculating timber member compressive capacity and adjustment factors is important for safety considerations and design. The following article will verify the maximum critical buckling strength calculated by the Timber Design add-on using step-by-step analytical equations as per the NDS 2018 standard including the compressive adjustment factors, adjusted compressive design value, and final design ratio.

Rolled sections, the most common cross‑section type in RFEM and RSTAB, can also have user‑defined parameters. To do this, select the cross‑section to be modified in the cross‑section library and click the [Parametric Input...] button.

In this article, the adequacy of a 2x4 dimension lumber subject to combined biaxial bending and axial compression is verified using the RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.

The add-on modules for designing structural member components according to national, European, and international standards also show design results in addition to numerical output in tables graphically, as diagrams displayed on the framework.

Screenshots

Simulation of Thermal Strains with Specification of Absolute Temperatures

Temperature-Loaded Steel Cantilever

Model of Bolted Column Base Point with Elastic Foundation in RFEM

$Plate and Shell Modeling \n in RFEM – Part 2$

Plate and Shell Modeling in RFEM – Part 2 | Wed, Feb 26, 2020 | 3:00 PM – 4:00 PM | CET

Reinforcement Data Transferred from RFEM (ASF File) in Allplan

KB 001860 | NBC 2020 Modal Response Spectrum Analysis and Base Shear Considerations in RFEM 6

NBC 2020 "Elastic Spectrum" Type in Response Spectrum Analysis Add-on

#053 Your Future at Dlubal Software

Model 004150 | Reinforced Concrete Tank with Buoyancy Design

KB 001848 | 2018 NDS Timber Column Design in RFEM 6

RFEM 6 - Timber Design Results

Product Features

This section offers useful information about general structural analysis and design as well as Dlubal Software programs.

Infotainment

Export RFEM or RSTAB Models to *.glb or *.glTF Format

RFEM and RSTAB models can be saved as 3D glTF models (*.glb and *.glTF formats). View the models in 3D in detail with a 3D viewer from Google or Babylon. Take your VR glasses, such as Oculus, to "walk" through the structure.

You can integrate the 3D glTF models into your own websites using JavaScript according to these instructions (as on the Dlubal website Models to Download).

Activation of Camera Flight Mode in RFEM

With the Camera Fly Mode view option, you can fly through your RFEM and RSTAB structure. Control the direction and speed of the flight with your keyboard. Additionally, you can save the flight through your structure as a video.

3D incompressible wind flow analysis with OpenFOAM^® software package
Direct model import from RFEM or RSTAB including neighboring and terrain models (3DS, IFC, STEP files)
Model design via STL or VTP files independent of RFEM or RSTAB
Simple model changes using Drag and Drop and graphical adjustment assistance
Automatic corrections of the model topology with shrink wrap networks
Option to add objects from the environment (buildings, terrain ...)
Wind load determined over the height of the building, depending on standard-specific parameters (velocity, turbulence intensity)
K-epsilon and K-omega turbulence models
Automatic mesh generation adjusted to the selected depth of detail
Parallel calculation with optimal utilization of the capacity of multicore computers
Results in just minutes for low-resolution simulations (up to 1 million cells)
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Graphical display of results on the Clipper/Slicer planes (scalar and vector fields)
Graphical display of streamlines
Streamline animation (optional video creation)
Definition of point and line probes
Display of aerodynamic pressure coefficients
Graphical display of turbulence properties in the wind field
Optional meshing using the boundary layer option for the area near the model surface
Consideration of rough model surfaces possible
Optional use of a seond-order numerical Order
Multilingual user interface (for example, German, English, Spanish, French)
Documentation possible in the RFEM and RSTAB printout report