PSI - Issue 73

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ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 73 (2025) 33–37

23rd International Conference on Modelling in Mechanics 2025 Mechanical Performance of 3D-Printed Joints for Timber Frames Marie Horňáková a *, David Juračka a , Pavel Dobeš b , Petr Lehner a a Department of Structural Mechanics, Faculty of Civil Engineering, VSB-Technical University of Ostrava, Ludvika Podeste 1875/17, 708 00 Ostrava-Poruba, Czech Republic b Centre of Building Experiments and Diagnostics, Faculty of Civil Engineering, VSB-Technical University of Ostrava, Ludvika Podeste 1875/17, 708 00 Ostrava-Poruba, Czech Republic Abstract The possibilities of 3D printing are wide and its involvement in structural engineering is a current issue. The aim of this study was to experimentally verify the mechanical properties of 3D printed joints for timber frames using compression testing. Five specimens were tested, each with differently positioned holes for three pins. The samples were fabricated from a 3D printer and were fitted with wooden prisms to which they were connected by steel pins. The experiments were performed on a universal testing machine and the progress of the testing was recorded in a force-displacement diagram. The design, manufacture and testing are part of an extensive research programme looking at the suitability of 3D printing in the construction industry. The experimental results are complemented by a simplified numerical model that assumes boundary conditions. The study provides valuable insights for the optimization of the design of 3D printed joints and highlights the importance of the geometric arrangement of the holes to improve mechanical properties. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers Keywords: experiments; 3D print; compression test; wood connection. 1. Introduction In recent years, wood has become increasingly popular in structural applications. From simple frame structures to complex architectural elements, wood offers unique properties (Mitterpach et al., 2020) . A key aspect for the effective use of timber in complex structures is the reliable and efficient joining of timber elements. However, traditional joining 23rd International Conference on Modelling in Mechanics 2025 Mechanical Performance of 3D-Printed Joints for Timber Frames Marie Horňáková a *, David Juračka a , Pavel Dobeš b , Petr Lehner a a Department of Structural Mechanics, Faculty of Civil Engineering, VSB-Technical University of Ostrava, Ludvika Podeste 1875/17, 708 00 Ostrava-Poruba, Czech Republic b Centre of Building Experiments and Diagnostics, Faculty of Civil Engineering, VSB-Technical University of Ostrava, Ludvika Podeste 1875/17, 708 00 Ostrava-Poruba, Czech Republic Abstract The possibilities of 3D printing are wide and its involvement in structural engineering is a current issue. The aim of this study was to experimentally verify the mechanical properties of 3D printed joints for timber frames using compression testing. Five specimens were tested, each with differently positioned holes for three pins. The samples were fabricated from a 3D printer and were fitted with wooden prisms to which they were connected by steel pins. The experiments were performed on a universal testing machine and the progress of the testing was recorded in a force-displacement diagram. The design, manufacture and testing are part of an extensive research programme looking at the suitability of 3D printing in the construction industry. The experimental results are complemented by a simplified numerical model that assumes boundary conditions. The study provides valuable insights for the optimization of the design of 3D printed joints and highlights the importance of the geometric arrangement of the holes to improve mechanical properties. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers Keywords: experiments; 3D print; compression test; wood connection. 1. Introduction In recent years, wood has become increasingly popular in structural applications. From simple frame structures to complex architectural elements, wood offers unique properties (Mitterpach et al., 2020) . A key aspect for the effective use of timber in complex structures is the reliable and efficient joining of timber elements. However, traditional joining © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the event organizers

* Corresponding author. E-mail address: marie.hornakova @vsb.cz * Corresponding author. E-mail address: marie.hornakova @vsb.cz

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers 2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers

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