PSI - Issue 73

Pavel Dobeš et al. / Procedia Structural Integrity 73 (2025) 1–8 Author name / Structural Integrity Procedia 00 (2025) 000–000

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2.3. Calculation of the racking resistance according to Eurocode 5 The standard for the design of timber structures, Eurocode 5 provides two simplified methods for analysing wall diaphragms to calculate the horizontal load-carrying capacity (racking resistance) (Method A, Method B). Both simplified methods assume sufficient anchoring to the foundation to effectively prevent overturning or sliding (tie down anchor), as well as in-plane stiffening to transfer horizontal shear stress (e.g. board materials, diagonal bracing). The racking capacity of the wall panel with vertically oriented OSB boards was calculated using the simplified method A based on knowledge of the panel geometry, the load-carrying capacity of metal staples and their spacing. The characteristic value of the racking capacity is F v,Rk = 69.99 kN. The design racking capacity using the modification factor k mod = 1.0 and the partial factor for connections ɣ M = 1.3 is then F v,Rd = 53.54 kN. 3. Results 3.1. Experimental testing This section summarizes the results of experimental testing on large-scale wall panels with different OSB sheathing configurations: A01 (horizontally oriented sheathing without any glued joints), A02 (horizontally oriented sheathing with glued tongue-and-groove joints), and B01 (vertically oriented sheathing). The graphs below show the deformation-load curves for selected tested wall panels in three different sheathing configurations (see Fig. 4 to Fig. 6). The maximum load and the corresponding deformation at failure for each test specimen can also be seen from the graphs. The limit horizontal deformation of 20 mm (1/150 of the panel height) is highlighted with a dashed line in the graphs. The graphs are accompanied by a table summarizing the experimentally determined load-carrying capacities and stiffnesses (see Tab. 1).

Fig. 4. Load-deformation diagram of wall panel with horizontally oriented OSB sheathing with unglued joints (Lokaj et al. 2023).

Fig. 5. Load-deformation diagram of wall panel with horizontally oriented OSB sheathing with glued joints (Lokaj et al. 2023).