FAQ 004349 | Is it possible to perform fire resistance design of cross-laminated timber panels in...

Video

First Steps with RFEM

First steps

We provide hints and tips to help you get started with the RFEM program.

24 February 2020

001207

Bastian Kuhn

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Question

Is it possible to perform fire resistance design of cross-laminated timber panels in RF‑LAMINATE?

Answer

Fire resistance design is not implemented in the RF‑LAMINATE add-on module by default.

However, you can calculate the charring rates yourself and consider them accordingly in the module. In the following example, this is explained on a simple plate.

Structural system (Figure 01):

  • Span 5 m
  • Plate width 2 m
  • LC1 (permanent) 1 kN/m² plus dead load
  • LC2 (medium) 2.5 kN/m²
  • 3 layers
    • S1 35 mm C24
    • S2 20 mm C24
    • S3 35 mm C24
The information regarding the correction factors and stiffnesses can be found in the attached file.

Factors for fire resistance:

  • Charring rate ß0 = 0.65 mm/min
  • Pyrolysis zone k0d0 = 7 mm
  • Charring time t = 30 min
  • Effective thickness def=t ß0+k0d0=30 min × 0.65 mm/min+7 mm = 26.5 mm
Remaining thickness of Layer 3 = 35 − 26.5 = 8.5 mm > 3 mm → thickness may be applied. (Figure 02)

Because of the modified layer thicknesses, a new stiffness matrix results, which is applied in RFEM for accidental combinations with the characteristic stiffness values. For the ultimate limit state, the design values are calculated here (Figure 03).

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  • Updated 19 November 2020

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