PSI - Issue 73

Marek Johanides et al. / Procedia Structural Integrity 73 (2025) 38–44 Marek Johanides and Antonín Lokaj/ Structural Integrity Procedia 00 (2025) 000–000

44

7

Table 2. Results of experiment B, using full-threaded screws. Test F max,test (kN) F max,d (kN) F max,k (kN)

d (-)

k (-)

u (mm) 290.50 34.95 408.18

ε (-)

B1 B2 B3

24.72 24.79 24.33

2.35 2.36 2.31

1.63 1.63 1.60

-

10.52

15.19

1.26 1.41

4. Conclusion This article focused on the behavior of semi-rigid connections in timber structures, specifically timber beams and struts joined using mechanical dowel-type fasteners. A total of six specimens were tested under static loading—three using a combination of bolts and dowels, and three using full-threaded screws. The study involved the formulation of analytical assumptions, which served as the basis for the experimental test design. The results obtained from the tests were then compared to evaluate the influence of different reinforcement configurations and fastener types on the structural performance of the connections. Acknowledgements Experimental measurements and research were carried out thanks to VSB Technical University of Ostrava. The work was supported by the Student Research Grant Competition of the VSB-Technical University of Ostrava under identification number 2022/55. References 1. Nowak, T.; Patalas, F.; Karolak, A. Estimating Mechanical Properties of Wood in Existing Structures—Selected Aspects. Ma-terials 2021, 14, 1941. 2. Malo, K.A.; Abrahamsen, R.B.; Bjertnæs, M.A. Some structural design issues of the 14-storey timber framed building “Treet” in Norway. Eur. J. Wood Prod. 2016, 74, 407–424. https://doi.org/10.1007/s00107-016-1022-5. 3. Crocetti, R. Large-span timber structures. In Proceedings of the World Congress on Civil, Structural and Environmental En-gineering (CSEE’16), Prague, Czech Republic, 30–31 March, 2016; pp. 1–23. https://doi.org/10.11159/icsenm16.124. 4. Frühwald, E. Analysis of structural failures in timber structures: Typical causes for failure and failure modes. Eng. Struct. 2011, 33, 2978–2982. 5. Steiger, R.; Serrano, E.; Stepinac, M.; Rajčić, V.; O’Neill, C.; McPolin, D.; Widmann, R. Strengthening of timber structures with glued-in rods. Constr. Build. Mater. 2015, 97, 90–105. 6. Vavrusova, K.; Mikolasek, D.; Lokaj, A.; Klajmonova, K.; Sucharda, O. Determination of carrying capacity of steel-timber joints with steel rods glued-in parallel to grain. Wood Res. 2016, 61, 733–740. 7. Zhou, S.-R.; Li, Z.-Y.; Feng, S.-Y.; Zhu, H.; Kang, S.-B. Effects of bolted connections on behaviour of timber frames under combined vertical and lateral loads. Constr. Build. Mater. 2021, 293, 123542. 8. Bouchaïr, A.; Racher, P.; Bocquet, J.F. Analysis of dowelled timber to timber moment-resisting joints. Mater. Struct. 2007, 40, 1127–1141. 9. Johanides, M.; Kubíncová, L.; Mikolášek, D.; Lokaj, A.; Sucharda, O.; Mynarčík, P. Analysis of Rotational Stiffness of the Ti mber Frame Connection. Sustainability 2021, 13, 156. 10. Lokaj, A.; Dobes, P.; Sucharda, O. Effects of Loaded End Distance and Moisture Content on the Behavior of Bolted Connections in Squared and Round Timber Subjected to Tension Parallel to the Grain. Materials 2020, 13, 5525. 11. ČSN EN 1995 -1-1; Eurocode 5: Design of Timber Structures—Part 1-1: General—Common Rules and Rules for Buildings. Czech Standards Institute: Praha, Czech Republic, 2006. 11. Kozelouh, B.: Timber Structures According to Eurocode 5; STEP 1: Design and construction materials; Translated by Bohumil Kozelouh; KODR: Zlin, Czech Republic, 1998; ISBN 80-238-2620-4. (In Czech)