PSI - Issue 59

Valentin Aleksiievets et al. / Procedia Structural Integrity 59 (2024) 710–717 Valentin Aleksiievets et al. / Structural Integrity Procedia 00 (2019) 000 – 000

715

6

The test data for samples 1-6 indicate that increasing the thickness of the middle element in nail connections does not lead to a significant increase in bearing capacity. However, there is a limit to the effective use of material, which is regulated by the thickness of the elements. In each case, the rational thickness for the middle element is 42.5 mm. а R k , kH b R k , kH

10 11 12 13 14

10 11 12 13 14 15 16

10 11 12 13 14

10 11 12 13 14 15 16

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9

 ,mm

 , mm

0 0.4 0.8 1.2 1.6 2 0 0.4 0.8 1.2 1.6 2 0 0.4 0.8 1.2 1.6 2

0 0.4 0.8 1.2 1.6 2

Fig. 4. Deformation diagrams of nail connections under the action of single loads: ( а) 11, (b) 12.

The performance of connections 7-12 shall be analyzed. As expected, the lowest bearing capacity was in connection 12, where the thickness of the outer elements was 10 mm, and it amounted to 12.7 kN. The bearing capacity of samples 7 was 14.8 kN; samples 8 - 15.2 kN; samples 9 - 14.4 kN; samples 10 - 13.6 kN; samples 11 - 13.3 kN. In this case, using a thickness of outer elements in connections greater than 30 mm is not advisable. The performance of connections 13-15 shall be analyzed. The following bearing capacity results were obtained: connection 13 - 23.0 kN; connection 14 - 24.1 kN; connection 15 - 23.4 kN. The nature of the failure of nail connections at a deformation of 2 mm is shown in Fig. 5.

Fig. 5. Nature of nail connections failure under a deformation of 2 mm.