Modeling of Cross-Laminated Timber Plate Curved by Screw-Press Bonding 1

Tips & Tricks

Our client had an exciting task of modeling a cross‑laminated timber plate with such a precamber that in the case of a span more than ten meters, the deformation is below the limit value of l/300 = 3.3 cm. The idea was to screw the plate on a glulam beam and then put it together with a glue approved by building authorities in order to create a rigid bond between the plate and the member.

The reason for this great effort was the possibility to manufacture the precamber of a glulam beam relatively easily and thus cost-efficiently. Generally, a precambered cross‑laminated timber plate means higher expenses.

The figure shows a precambered structure of glulam beam and a cross-laminated timber plate. The glulam beam has a function of binding girder connected to the plate rigidly.

The second part of my post deals with restoring forces resulting from the plate curvature that are calculated using the line imposed deformation. The third part presents the ultimate calculation of fully loaded “floor beams” in RFEM.

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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements