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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The results of the computer simulation experiment were verified by comparing them with the corresponding indicators obtained by investigation (Fig. 8).

Fig. 8. Coincidence of C deflections of the welded truss based on the results of computer simulation and small-scale experiments.

The coincidence of the results of the computer simulation experiment with the results of the small-scale experiment at the level of 94.6% for the ultimate operating loads of the truss was determined. This indicates that the proposed parameters of the finite element model which lies in the base of the ANSYS Workbench software are optimal and can be used for further computer simulation studies of welded trusses of this type to determine the parameters of their limit state with a high degree of reliability of the results obtained. Similarly, a full-scale welded truss was studied by a computer simulation experiment. For this purpose, an input information array was formed, which includes the real mechanical properties of A570-36 steel for both main material and weld, determined on samples from the material batch of the studied welded truss. Based on the results of modeling the behavior of the truss when it is loaded, the stresses in all elements of the welded truss were determined. Diagrams of the distribution of normal stresses along all structural elements of the truss – chords, braces, and risers – were obtained. This made it possible to analyze their values and determine their localization. It is shown that the maximum tensile stresses are formed in the lower chord (Fig. 9). The maximum compressive stresses – are in the upper chord (Fig. 10). The stresses along other structural elements of the truss are lower. Therefore, the diagrams of their distribution were not presented in the paper.

Fig. 9. Distribution of normal stresses along the lower chord of the truss under loading .

Fig. 10. Distribution of normal stresses along the upper chord of the truss under loading.

As seen from Fig. 9, the maximum tensile stresses are localized on the lower chord of the truss at a distance of 16.5 m from the hingeless support assembly. Relatively high stresses, but somewhat lower than the maximum ones, are formed at a distance of 1.5 m and 13.5 m from the same measuring base. The maximum compressive stresses are formed in the upper chord around 7 m and 11 m from the hingeless support assembly (Fig. 10).