# Stability of Cross-Laminated Timber Structures

**URL:** <https://community.dlubal.com/t/stability-of-cross-laminated-timber-structures/3525>\
**Category:** Product Support\
**Tags:** addon-multilayer-surface, laminated-timber, buckling-analysis\
**Created:** [May 16, 2026, 6:15am UTC](https://community.dlubal.com/t/stability-of-cross-laminated-timber-structures/3525 "2026-05-16T06:15:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![wolfram](https://community.dlubal.com/letter_avatar_proxy/v4/letter/w/e68b1a/32.png) [@wolfram](https://community.dlubal.com/u/wolfram)\
**Post date:** [May 16, 2026, 6:15am UTC](https://community.dlubal.com/t/stability-of-cross-laminated-timber-structures/3525/1 "2026-05-16T06:15:25Z")

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I’m using RFEM 6 and add-on for CLT structures. I know that this add-on does not calculate stability (buckling) directly. Which options do we have to check buckling of walls within the model? The same goes for fire combinations which are a lot of times critical.

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**Author:** ![gerhard.rehm](https://community.dlubal.com/user_avatar/community.dlubal.com/gerhard.rehm/32/98_2.png) [@gerhard.rehm](https://community.dlubal.com/u/gerhard.rehm)\
**Post date:** [May 16, 2026, 4:11pm UTC](https://community.dlubal.com/t/stability-of-cross-laminated-timber-structures/3525/2 "2026-05-16T16:11:10Z")

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Hello Wolfram,

the easiest way is to determine the eigenmode with the structural stability and then apply it as an imperfection. The internal forces according to second-order theory as well as the applied imperfection include the stability check for the stress verification. You can find more information here:

- [Stability consideration of planar components: e.g., cross-laminated timber wall 1](https://www.dlubal.com/de/support-und-schulungen/support/knowledge-base/001421)
- [Stability consideration of planar components: e.g., cross-laminated timber wall 2](https://www.dlubal.com/de/support-und-schulungen/support/knowledge-base/001423)
- [Stability consideration of planar components: e.g., cross-laminated timber wall 3](https://www.dlubal.com/de/support-und-schulungen/support/knowledge-base/001424)

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**Author:** ![wolfram](https://community.dlubal.com/letter_avatar_proxy/v4/letter/w/e68b1a/32.png) [@wolfram](https://community.dlubal.com/u/wolfram)\
**Post date:** [May 18, 2026, 12:17pm UTC](https://community.dlubal.com/t/stability-of-cross-laminated-timber-structures/3525/3 "2026-05-18T12:17:01Z")

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Thank you. That means I need the Structure Stability add-on? Could I manually input imperfection and then check the stresses after 2nd order theory analysis?

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<div class="post-metadata">

**Author:** ![gerhard.rehm](https://community.dlubal.com/user_avatar/community.dlubal.com/gerhard.rehm/32/98_2.png) [@gerhard.rehm](https://community.dlubal.com/u/gerhard.rehm)\
**Post date:** [May 18, 2026, 1:05pm UTC](https://community.dlubal.com/t/stability-of-cross-laminated-timber-structures/3525/4 "2026-05-18T13:05:48Z")

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Alternatively you can use equivalent loads or create a load case and apply loads to get the buckling shape. For latest you can then take this deformation shape and assign the imperfection:

 ![image](https://community.dlubal.com/uploads/default/original/2X/a/acd2665ad9a143de51e0da449417823da0443b2d.png)