PSI - Issue 81

Valentin Aleksiievets et al. / Procedia Structural Integrity 81 (2026) 422–429

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Fig. 7. Deformation diagram of nail joints 3 under low-cycle loads at initial deformations Δ =1.4 mm

Fig. 8. Deformation diagram of nail joints 6 under low-cycle loads In nail joints 7 at the upper level of low-cycle loading, the force of which was 15.6 kN, the total initial shear deformations at the first cycle of load application were сус ,1 =1.0 mm. In the second and fifth cycles they achieved сус ,2 =1.05 mm and сус ,5 =1.155 mm respectively. Further growth of deformations occurred in subsequent cycles of low-cycle loading: in the tenth and twentieth cycles the increase in deformations was respectively 6.1% and 12.6% compared to the fifth cycle and reached values сус ,10 =1.225 mm and сус ,20 =1.295 mm, on the fiftieth cycle, the resulting deformations of the mutual displacement of the elements reached сус ,50 =1.43 mm. The residual deformations were: hundredth cycle – 0, сус ,100 =1.04 mm, one hundred and fiftieth and two hundredth – 0, сус ,150 =1.08 mm, 0, сус ,200 =1.265 mm (Fig. 9).

Fig. 9. Deformation diagram of nail joints 7 under low-cycle loads at initial deformations Δ =1.4 mm

Connections 8 were investigated under the action of a low-cycle load, the value of which was 15.2 kN (Fig. 10).