Modeling of Cross-Laminated Timber Plate Curved by Screw-Press Bonding 3

Tips & Tricks

The last part of my post deals with consideration of forces resulting from imposed deformation of cross‑laminated timber plate when designing a structure with imposed loads.

For this, a new structure is modelled with the glulam beam rigidly connected to the plate. The structure applies Load Case 1 with the load of 1.13 kN/m, Load Case 2 of 0.85 kN/m and Load Case 3 of 0.21 kN/m. The quasi‑permanent load case combination with LK1 = 1.6 LF1 + 0.5 LF2 + LF3 is governing.

In order to consider internal forces including the pre‑curving forces mentioned previously, there is a result member defined integrating the forces of Position 1 (described in Part 1 and Part 2 of this article) and the forces of CO1. The figure shows the integration performed for both of the binding girders of the top and bottom model.

All these forces result in the deformation of 7.4 cm. However, this is subtracted from the precamber of 12 cm so the precamber of 4.6 cm still remains. Thus, the precamber is sufficient and can never fail.

The result member design with integrated forces in RF‑TIMBER shows the load of below 60 %. Therefore, all design requirements are met.

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RFEM Main Program
RFEM 5.xx

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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