New feature in FEM-Design 21 – Fire design of CLT panels
We are heading towards a new year and by that also a new version for FEM-Design! This time it´s version 21 including a lot of useful and good functionality. A major new feature is fire design of Cross Laminated Timber panels (CLT).
Having wood as a structural material is becoming more and more common, but it also raises demands on the designer to ensure the structure's capacity - in all load limits, including fire. We are now pleased to announce that fire sizing of CLT will be possible in FEM-Design 21. So how does this work?
The program uses a method where the cross-sectional area is reduced with regard to the charring of the wood material similar to the method implemented for beams and columns (timber bars) in FEM-Design. Start by setting the duration of the fire and which sides are exposed to the fire. Then choose any fire protection.
To deal with failure by laminating layers in the KL board due to the deteriorating properties of the adhesive in the event of a fire, a multiplier on the charring speed is used. It is also possible to ignore layers that fall below a certain thickness. This can otherwise lead to a favorable behavior for thin, partially charred layers.
The reduced area is calculated and what remains of the KL panel is checked against the usual checks.
Regarding results and documentation, detailed formulas for all design checks are reported. In addition to this, the stress distribution across the reduced cross-section is also shown in a clear and pedagogical manner.
Stay tuned for more new features in upcoming newsletters!
Do not hesitate to contact us if you have any questions or want to know more about FEM-Design's functionality!