Deflection in z-Direction
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In this article, the design of a timber panel wall with the beam panel thickness type is performed.
Fire design according to Chapter 16 of the NDS [1] for wood members and surfaces is available in the Timber Design add-on. This article shows how the charring of wood and reduced cross-sectional dimensions can be accounted for in the fire design with an example from AWC Technical Report No. 10 [2].
For the serviceability of a structure, the deformations must not exceed certain limit values. This article describes an example that shows how to analyze the deflection of members using Dlubal's design add-ons.
A standard scenario in timber member construction is the ability to connect smaller members by means of bearing on a larger girder member. Additionally, member end conditions may include a similar situation where the beam is bearing on a support type. In either scenario, the beam must be designed to consider the bearing capacity perpendicular to the grain according to NDS 2018 Sec. 3.10.2 and CSA O86:19 Clauses 6.5.6 and 7.5.9. In general structural design software, it is typically not possible to carry out this full design check, as the bearing area is unknown. However, in the new generation RFEM 6 and Timber Design add-on, the added "design supports" feature now allows users to comply with the NDS and CSA bearing perpendicular to the grain design checks.
It is now possible to keep the results of the steel, steel joint, aluminum, and timber design despite changing the design properties and settings (see the setting in the image). The results are thus not deleted, but marked as invalid.
When restarting the design, only the invalid design results are updated. If objects are subsequently added to the design, they are additionally designed when restarting the design, while the previously calculated results remain valid.
For the fire resistance design of timber surfaces, you can display a charring diagram depending on the time of fire exposure.
It is also possible to print this charring diagram into the printout report.
You have the option to perform the fire resistance design of surfaces using the reduced cross-section method. The reduction is applied over the surface thickness. It is possible to perform the design checks for all timber materials allowed for the design.
For cross-laminated timber, depending on the type of adhesive, you can select whether it is possible for individual carbonized layer parts to fall off, and whether you can expect increased charring in certain layer areas.
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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.
How can I change the display size of formulas in the result details?
How can I perform member design by case for different settings in the design configuration?
What is the conservatism factor for CLT in Timber Design?
How can the NDS and CSA O86 factors be manually adjusted for consideration in the Timber Design add-on?
What calculation is carried out for the NDS Strength Configuration "Calculation of Torsion" options?
Which Dlubal software products do you recommend for the structural analysis and design of timber structures in particular?
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