PSI - Issue 81

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 81 (2026) 192–197

© 2026 The Authors. Copy from the contract: 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 DMDP 2025 organizers Keywords: steel-timber truss, stress-strain state, modeling, local damage, progressive destruction. 1. Introduction In construction practice, materials, elements, and structures made of timber are widely used (Gomon et al. (2019); Gong et al. (2019); Ivaniuk et al. (2025); Landis et al. (2002); Homon et al. (2024); Hua et al. (2025)). Timber exhibits high physical and mechanical properties (Thelanderson and Larsen (2003); Homon et al. (2024); Moya and Bano (2017); Huang et al. (2006); Green and Kretschmann (1992); Gomon et al. (2022)). It also has a number of advantages over other materials (Yasniy et al. (2022); Zakic (1974); Matviiuk et al. (2025); Patton-Mallory and Cramer (1987); Homon et al. (2023)). Timber bending members are often used as load-bearing roof structures (Betts et al. (2010); Pavluk et al. (2023); Wang et al. (2025); Sobczak-Piastka et al. (2023)), including trusses. Such elements and structures are subjected to various types of loading (Mykhailovskyi and Komar (2024); Pavluk et al. (2025); Shams Huq et al. (2025); Janiak et al. (2023); Han et al. (2025); Gomon et al. (2023)). The failure of structures and buildings may be caused by any of a wide range of accidental situations that are not considered in conventional design approaches (Datsiuk et al. (2024); Köhler et al. (2007); Zhao et al. (2020); Heidarzadeh et al. (2026)). Military actions and other accidental events leading to the failure of individual web members (except for the support diagonal) of the metal – timber trapezoidal truss investigated in this study are usually not addressed in standard design practice. As practical experience shows, the failure of individual web members of a metal – timber trapezoidal truss does not always result in the complete collapse of the structure. Issues of structural protection have currently been studied using numerous examples of accidents involving the progressive collapse of large-panel buildings, and calculation methods and design recommendations have been developed to prevent disproportionate (cascade-type) failure and to confirm their effectiveness. However, the number of comparable solutions for timber Abstract The work of a trapezoidal steel-wood truss with a span of 24 m with damage to individual braces was modeled in the LIRA software package. 2 geometric schemes of such trusses were considered. Three types of loads were applied to the trusses: self-weight of the roof system, snow on the entire span, and snow on half of the span. The most dangerous cases of destruction of individual elements of both trusses were modeled, which subsequently affect the operation of the truss as a whole. The truss forces were calculated during the destruction of individual elements. Suggestions were made to improve the design of cross-sections of individual elements of the studied trusses. VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Modeling the behavior of a steel-timber trapezoidal truss with local damage to individual elements Svyatoslav Gomon a,* , Valentin Aleksiievets a , Petro Gomon a , Sviatoslav Homon a , Nazarii Riabcheniuk a , Diana Kaynts b , Oksana Mykaylo b , Yolana Golyk b a National University of Water and Environmental Engineering, Soborna 11, 33000 Rivne, Ukraine b Uzhhorod National University, 14 University Str., 88000 Uzhgorod, Ukraine

* Corresponding author. Tel.: +38-067-915-86-50; fax: +0-000-000-0000 .

*

E-mail address: slavagomon@ukr.net

2452-3216 © 2026 The Authors. Copy from the contract: 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 DMDP 2025 organizers 10.1016/j.prostr.2026.03.033