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Amy Heilig, PE
CEO – USA Subsidiary | Sales Engineer
Laminate, Sandwich, and Cross-Laminated Timber (CLT) Structures
Solution for Laminate, Sandwich, and Cross-Laminated Timber (CLT) Structures
Recommended Products for Laminate, Sandwich, and CLT Structures
Definition of Multilayer Surfaces Such as Cross-Laminated Timber (CLT)
Multilayer Surfaces (e.g. Laminate, CLT) for RFEM 6
Add-On
The Multilayer Surfaces add-on allows you to define multilayer surface structures. The calculation can be carried out with or without the shear coupling.
Construction Stages
Construction Stages Analysis (CSA) for RFEM 6
Add-On
The Construction Stages Analysis (CSA) add-on allows for considering the construction process of structures (member, surface, and solid structures) in RFEM.
Support and Learning
We provide professional support and many services in order to help you with finding a quick and efficient solution for your projects.
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Palazzo Méridia in Nice, France
The recent trend in high-rise construction is clearly dominated by timber as the most ecological and environmentally friendly material. The project promoter Nexity is firmly committed to using constructive solutions with multiple labels and certifications in order to reduce carbon emissions and has therefore already built several commercial and office buildings using timber. These include Palazzo Meridia in Nice. This is currently the tallest CLT office building in France. The Dlubal customer CBS-Lifteam was responsible for the planning, supply, and installation of the timber structure.
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Project Location
Nice, France
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Software
RFEM 5 | Structural FEA Software
More About Customer Project
© Architecture-Studio
Outdated Products
RFEM 5 | FEA Structural Analysis Software
The structural analysis program RFEM provides structural engineers with a 3D FEA program that meets all the requirements of modern civil engineering. Efficient data input and intuitive handling facilitate the modeling of simple and complex structures.
The add-on module for laminate, sandwich, and cross-laminated timber (CLT) structures in RFEM 5 is:
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In RFEM 6 it is possible to define multilayer surface structures with the help of the “Multilayer Surfaces” add-on. Hence, if you have activated the add-on in the model’s Base Data, it is possible to define layer structures of any material model. You can also combine material models of, for example, isotropic and orthotropic materials.
The support of the cross-laminated timber panel deserves special attention. Usually, a cross‑laminated wall is secured against shearing by means of shear connectors and against lifting forces by means of tie rods.
One of the advantages of entering the structure in RFEM is the complete freedom when selecting the geometry. You can easily select a structure where re‑entrant rolling corners are given as shown in the image.
To better distinguish between the different layer compositions (for example, for walls and ceilings), you can assign user‑defined colors and textures to each composition.
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Among others, the following cross-laminated timber manufacturers are available in the layer structure library:
- Binderholz (USA)
- KLH (USA, CAN)
- Kalesnikoff (USA, CAN)
- Nordic Structures (USA, CAN)
- Mercer Mass Timber
- SmartLam
- Sterling Structural
- Superstructures listed in Lignatec Edition 32 "Cross-Laminated Timber of Swiss Production"
By importing a structure from the layer structure library, all relevant parameters are adopted automatically. The library is continually updated.
- General stress analysis
- Graphical and numerical results of stresses and stress ratios fully integrated in RFEM
- Flexible design with different layer compositions
- High efficiency due to few entries required
- Flexibility due to detailed setting options for basis and extent of calculations
- A local overall stiffness matrix of the surface in RFEM is generated on the basis of the selected material model and the layers contained. The following material models are available:
- Orthotropic
- Isotropic
- User-defined
- Hybrid (for combinations of material models)
- Option to save frequently used layer structures in a database
- Determination of basic, shear, and equivalent stresses
- In addition to the basic stresses, the required stresses according to DIN EN 1995-1-1 and the interaction of those stresses are available as results.
- Stress analysis for structural surfaces including simple or complex shapes
- Equivalent stresses calculated according to different approaches:
- Shape modification hypothesis (von Mises)
- Shear stress hypothesis (Tresca)
- Normal stress hypothesis (Rankine)
- Principal strain hypothesis (Bach)
- Calculation of transversal shear stresses according to Mindlin or Kirchhoff, or user-defined specifications
- Serviceability limit state design by checking surface displacements
- User-defined specifications of limit deflections
- Possibility to consider layer coupling
- Detailed results of individual stress components and ratios in tables and graphics
- Results of stresses for each layer in the model
- Parts list of designed surfaces
- Possible coupling of layers entirely without shear
After the calculation, the maximum stresses, stress ratios, and displacements are displayed by load case, surface, or grid points. The design ratio can be related to any kind of stress type. The current location is highlighted by color in the RFEM model.
In addition to the result evaluation in tables, it is possible to display the stresses and stress ratios graphically in the RFEM work window. For this, you can adjust the colors and values assigned in the panel.
It is necessary to select load cases, load combinations, and result combinations for the ultimate and the serviceability limit state design. After selecting the surfaces to be designed, you can define the relevant material model.
The structure of layers forming the basis for the stiffness calculation can vary. You can adjust the parameters defined by the selected material model according to your individual needs. The 3*3 matrix of the layers is modifiable as well. In this way completely free selection when generating the stiffnesses is provided.
The limit stresses of each layer are defined by the selected material. These values can be customized as well.
Which programs do I need for laminate and sandwich structures, or cross-laminated timber (CLT)?
Which Dlubal Software programs can I use to calculate and design timber structures?
How does the "Orthotropic Plastic" material model work in RFEM?
Why are the stresses of the 90° orientation not displayed for a layer with the orthotropy direction 90° for σb,90 in RF‑LAMINATE?
What options are available for the serviceability data in RF‑LAMINATE to calculate the local deformation uz,local applied in the design?
Why is it not possible to design any LVL material according to the SIA 265 standard in RF‑/TIMBER Pro?
