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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
In addition to determine loads, there are some particularities concerning the load combinatorics in timber design which have to be considered. Contrary to steel structures where the largest loading results from all unfavorable actions, in timber construction, the strength values are dependent on the load duration and the timber humidity. Special characteristics have to be considered as well for the serviceability limit state design. The following article discusses the effects on the design of wooden elements and how this is possible with RSTAB and RFEM.
The American Wood Council (AWC) has released the 2018 Edition of the National Design Specification (NDS) for Wood Construction. This is the second edition of the NDS to contain a chapter dedicated to cross-laminated timber (CLT) design. Therefore, a couple of revisions were included in the 2018 NDS when compared to the previous 2015 Edition.
Stability Analysis of Two-Dimensional Structural Components on Example of Cross-Laminated Timber Wall 3
As an alternative to replacement bar method in this paper, the possibility will be explained to determine the internal forces of the risk of bending wall 2nd order theory taking into account imperfections and then perform a measurement of the cross section for bending and pressure.
Stability Analysis of Two-Dimensional Structural Components on Example of Cross-Laminated Timber Wall 1
Basically, you can design structural components made of cross-laminated timber in the RF-LAMINATE add-on module. Since the design is a pure elastic stress analysis, it is necessary to additionally consider the stability issues (flexural buckling and lateral-torsional buckling).
For wide-span ceilings, the vibration design of cross‑laminated timber plates is often governing. The advantage of the lighter material of timber over concrete turns into a disadvantage because a high mass material is advantageous for a low natural frequency.
RF-LAMINATE allows a free definition of materials. Thus, you can combine any compositions of different material. The combination of concrete and timber is possible as well. However, the rigid composite must be provided when defining such a composition. In RF‑LAMINATE, you can consider full shear coupling or no shear coupling at all.
In RF‑LAMINATE, it is possible to design also curved quadrangular surfaces. In the example in the figure, the cross‑laminated timber layers of a chair are designed.
RF-LAMINATE is an excellent tool for the design of carbon fibers. You can define the anisotropic material behavior of carbon fibers directly in a multi‑layer structure in the module.
To better distinguish the different layer compositions, e.g. for walls and ceilings, you can assign user‑defined colours and textures to each composition.
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