Unstable timber structure problem, how to model timber beams resting on another beam at the roof?

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1

The timber structure has built-up column sections in the y-axis; the beam is continuous throughout the column, and in the x-axis, there are 6.8-meter-long timber beams resting on the y-axis beams. What should be the hinge conditions of the x-axis beams? When modeled as rotation-free pin ends, the structure becomes unstable. When one beam is considered rigid, it is analyzed as stable. There is a real-life example of the structure; it doesn’t have any braces or timber frame walls. Please help me fix the unstable structure problem.

IMG_0142
IMG_01422196×913 326 KB

2

Hi Plshelpmybf,

a warm welcome to you. We are pleased that you are part of the Dlubal community.

To solve the problem with the unstable model, I need the RFEM file. Please upload it here. Alternatively, you can also send me a private message with the file.

grafik
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Frank

7

Hi,
the edges of the OSB plate should not be modelled without any hinge. Right now the plate of 15mm thickness is giving the structure it`s stability. This is not possible for timber structures.
This structure requires braces in the horizontal and vertical beams.
I attached an example where I added braces on specific points. Again just as an example.
Slab.rf6 (1.1 MB)

Best Regards

Bastian Kuhn