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001091
Dipl.-Ing. (FH) Bastian Kuhn, M.Sc.
2015-08-21

Modeling of Cross-Laminated Timber Plate Curved by Screw-Press Bonding 2

This part explains the determination of forces arising when screwing a straight cross-laminated timber plate to a curved glulam beam. For this, a glulam beam with a curved member was modeled in RFEM. The member has a precamber of 12 cm, since the preliminary design showed that the applied precamber of 6 cm will never be sufficient to maintain l/300. The dimensions of the bottom chord are 12 cm wide by 32 cm high. The plate was selected in RF‑LAMINATE as a three‑layer plate with a thickness of 8 cm.

There is a particularity in the contact area between the glulam beam and the plate. The plate was 1 cm milled in order to avoid lateral slippage during the pressing procedure. This can be considered in RF‑LAMINATE using various plate compositions.

The plate deformation in the final state is defined by the line deformation of 15.5 cm (12 cm precamber + 3.5 cm axis plate). Based on this imposed deformation, the resulting beam reserve is 1.8 cm (see the figure) and the bending moment is 9.25 kNm in the beam and plate.

The design of the T‑beams, including consideration of these forces, is described in the third part of the post.

Author

Mr. Kuhn is responsible for developing products for timber structures, and provides technical support for our customers.

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