PSI - Issue 59

Yaroslav Shved et al. / Procedia Structural Integrity 59 (2024) 664–671 Yaroslav Shved et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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For the proposed version of the locally strengthened welded truss, a computer simulation experiment was performed by analogy with the one described above. According to its results, it was found that after strengthening the welded truss, the permissible operating loads within the elastic deformation of the structure are 8.4% higher compared to the basic version of the truss (607 kN and 560 kN in accordance). Such strengthening is advisable during operation, as it makes it possible to expand the functionality of the truss without losing its strength and reliability. 4. Conclusions The paper determines the actual mechanical properties of A570-36 steel for main and welded material, which have 1.5...2.5 times less dispersal of values than in the standard and quality certificates for this steel. The stress strain analysis of a welded truss was performed based on the results of small-scale and computer simulation experiments, and the locations of maximum stresses and their values were determined. Verifying the computer simulation experiment results with the small-scale investigation results showed a coincidence of 94.6% for the ultimate operating loads of the truss. Recommendations for strengthening the studied truss were developed, which made it possible to increase its strength by 8.4%. References Ahrari A., Atai A., 2013. Fully stressed design evolution strategy for shape and size optimization of truss structures. Computers & Structures 123, 58-67. Brevus, V., Yasniy, O., Moutou Pitti, R., Lapusta, Y., 2013. Assessment of the Probability of Failure of Reactor Vessels After Warm Pre stressing Using Monte Carlo Similations. International Journal of Fracture 180, 137-144. DBN V.1.2.-14-2018. General principles of ensuring the reliability and constructive safety of buildings, structures, building structures and foundations. (In Ukrainian) Degertekin, S.O., 2012. Improved harmony search algorithms for sizing optimization of truss structures. Computers and Structures 92, 229 - 241. Didych, I., Pastukh, O., Pyndus, Y., Yasniy, O., 2018. The evaluation of durability of structural elements using neural networks. Acta Metallurgica Slovaca 24(1), 82 - 87. DSTU 4484:2005/GOST 535 - 2005 Long and shaped steel products of ordinary quality carbon steel. General technical conditions. (In Ukrainian). Khajeh, Abbas; Kiani, Alireza; Seraji, Mahmoud; Dashti.,2023. Weight minimization of truss structures using an improved Harris hawks optimization algorithm. Innovative Infrastructure Solutions 8(4), 112. Kovalchuk Y., Shynhera N., 2011. Physical modeling for estimation of the residual life of welded truss structures. Progressive materials and technologies in mechanical engineering, construction and transport: scientific conference TNTU, 10. (In Ukrainian) Kryzhanivskyy Y., Poberezhny, L., Maruschak, P., Lyakh, M., Slobodyan V., Zapukhliak V., 2019. Influence of test temperature on impact toughness of X70 pipe steel welds. Procedia Structural Integrity 16, 237-244. Pat. No. 40196 Ukraine, IPC G01N 3/00. Device for basing welded trusses during for static and cyclic strength tests. Applicant and patentee Ternopil State Technical University - №40196 . (In Ukrainian) Rajput, S.P.S., Datta, S., 2019. A review on optimization techniques used in civil engineering material and structure design. Materials Today: Proceedings 2(26), 1482 - 1491. Shynhera N., 2012. Statistical model for determining the residual life of a typical welded trusses under cyclic loads: PhD thesis for the degree of Candidate of Technical Sciences: 01.05.02 - mathematical modeling and computational methods. 36-38. (In Ukrainian).