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Useful Program Features
The Knowledge Base includes technical articles on a wide array of structural analysis and design topics.
These articles are intended to help you navigate through the Dlubal programs, learn efficient tips and tricks, and provide further insight into the program features.
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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.
There are several options to calculate a semi-rigid composite beam. They differ primarily in the type of modeling. Whereas the Gamma method ensures a simple modeling, additional efforts are required when using other methods (e.g. shear analogy) for the modeling which are, however, offset by the much more flexible application compared to the Gamma method.
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.
The last part of my post deals with consideration of forces resulting from imposed deformation of cross‑laminated timber plate when designing a structure with imposed loads.
This part explains the determination of forces arising when screwing a straight cross‑laminated timber plate to a curved glulam beam. For this, a glulam beam with a curved member was modelled in RFEM. The member has a precamber of 12 cm since the preliminary design showed that the precamber of 6 cm applied will never be sufficient to keep l/300. Dimensions of the bottom chord are 12/32 cm. The plate was selected in RF‑LAMINATE as a three‑layer plate with the thickness of 8 cm.
Our client had an exciting task of modeling a cross‑laminated timber plate with such a precamber that in the case of a span more than ten meters, the deformation is below the limit value of l/300 = 3.3 cm. The idea was to screw the plate on a glulam beam and then put it together with a glue approved by building authorities in order to create a rigid bond between the plate and the member.
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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