PSI - Issue 81

Yaroslav Kovalchuk et al. / Procedia Structural Integrity 81 (2026) 170–176

176

1. The highest stresses were observed in the support-adjacent sections of the truss, i.e., at the beginning (250 mm) and at the end (7750 mm). 2. The maximum stress in these sections under a load of 560 kN reaches 216 MPa, which approaches the allowable stress limit but does not exceed it. Thus, at this loading, the structural strength of the upper chord, according to the SSS, is ensured. 4. Conclusions The distribution of stresses along the lower chord of the trapezoidal truss 8000x580 mm was obtained at different values of the load applied to the nodes of the lower and upper chords. The computer simulation established the locations of the maximum stresses: – in the lower chord - in the middle part of the lower chord of the truss, in the area from 2.10 m to 3.6 m, – in the upper chord - in the support-adjacent sections of the truss, i.e. at the beginning (250 mm) and at the end (7750 mm). It was established that in both chords of the truss, the maximum stresses (180 MPa and 216 MPa) do not exceed the allowable limits. References Azari Dodaran, N.; Ahmadi, H.; Lotfollahi-Yaghin, M.A.. 2021. Static strength of axially loaded tubular KT-joints at elevated temperatures: Study of geometrical effects and parametric formulation. Mar. Struct. 2018, 61, 282–308. Efendi, A., 2024. Behavior of welded joints on the roof truss of KOJK Office using LISA V.8 FEA Journal of Metallurgical Engineering and Processing Technology, 1 (5), 24-41. Hobbacher 2016. Recommendations for Fatigue Design of Welded Joints and Components IIW Collection, Springer International Publishing, Li, T.; Lie, S.T.; Shao, Y.B., 2017. Fatigue and fracture strength of circular hollow section TT-joint. J. Constr. Steel Res., 129, 101–110. Kaminski, Marcin, and Rafal Blonski.2022. Analytical and numerical reliability analysis of certain Pratt steel truss. Applied Sciences. 12.6: 2901. Khademi, F., 2017. Enhancing Load Rating of Railway Truss Bridges through a Hybrid Structural Analysis and Instrumentation Procedure. Ph.D. Thesis, Illinois Institute of Technology, Chicago, ON, USA. 123 – 132. Kovalchuk,Y., Shynhera. N., 2017, The influence of height of angular profile of rods on rectangular welded truss deformation Scientific Journal of TNTU, 4 (88), 82–87. Kovalchuk, Y., Shynhera, N., Shynhera M,, 2025. Deformation behavior simulation of a sub-rafter welded truss. Scientific Journal of TNTU. 2 (118). 109–116. Lan, X.; Huang, Y.; Chan, T.-M.; Young, B., 2018. Static strength of stainless steel K- and N-joints at elevated temperatures. Thin-Walled Struct. 122, 501–509. Larsen, Mikkel L о venskjold, et al. 2021.Fatigue life estimation of the weld joint in K-node of the offshore jacket structure using stochastic finite element analysis. Marine Structures. 78: 103020. Majko J., Saga M., Sagova Z., Handrik M., Kopas P., Jakubovicova L., 2022. Numerical analysis and optimization of large dimensioned structures considering stress concentrations in welded joint. MATEC Web of Conferences, 357, 02002 Poberezhnyi L., Maruschak, P., Prentkovskis O., Danyliuk I., Pyrig T, Brezinová J., 2016. Fatigue and failure of steel of offshore gas pipeline after the laying operation. Archives of Civil and Mechanical Engineering 16 (3), 524-536 Pidgurskyi M., Stashkiv M., Pidgurskyi I. 2025. Stress redistribution and failure of mobile machines frame during propagation of crack-like defects. Engineering Failure Analysis 170, 109217 Tiainen, T.; Mela, K.; Jokinen, T.; Heinisuo, M., 2017. The effect of steel grade on weight and cost of warren-type welded tubular trusses. Proc. Inst. Civ. Eng. Struct. Build., 170, 855–873. Tong, G., Zhongxiang, L. Jie, L., Dazhang H., 2016. Diagnosis and Mitigation of Fatigue Damage in Longitudinal Diaphragms of Cable-Stayed Bridges. Journal of Bridge Engineering. 118 – 127. Shao, Y.; He, S.; Zhang, H.; Wang, Q.,,2017. Behavior of tubular T-joints after exposure to elevated temperature. Ocean Eng., 129, 57–67. Shved; Y., Kovalchuk; Y., Shynhera, N., 2022. Welded truss deformation under thermal influence. Scientific Journal of TNTU. 1 (105). P. 13–18. Suo, Y.; Yang, W.; Chen, P., 2018. Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure. Appl. Sci. 2018, 8, 1701. Zhang, Zhaobo, et al. , 2023. Deflection Estimation of Truss Structures Using Inverse Finite Element Method. Sensors 23.3 : 1716.