PSI - Issue 81

Svyatoslav Gomon et al. / Procedia Structural Integrity 81 (2026) 192–197

194

Fig.2. Geometric scheme of truss No. 2

Following the calculation of axial forces in the elements of truss No. 1, simulations of the stress-strain state are carried out under the failure of individual truss members. The diagonals and verticals of the truss, except for the support diagonals, are excluded, and the internal forces are calculated for each separate case. The results and computational schemes for truss No. 1 are presented in Figs. 3, 4, and 5 and Table 1.

Fig.3. Structural scheme of truss No.1 after failure of member 11

Fig.4. Structural scheme of truss No.1 after failure of member 15

Fig.5. Structural scheme of truss No.1 after failure of member 16

Table 1. Comparison of internal forces in truss No. 1 under element failure

Element No.

Design internal forces, kN

Percentage, % Design internal forces after failure of member 16, kN

Percentage, % Design internal forces after failure of member 11, kN

Percentage, %

Design internal forces after failure of member 15, kN

1 2 3 7 8

0

0

0

0

0

0

0

-333.5 -333.5 233.6 336.7 -37.7 -73.9 -298.7 125.7

-297.2 -301.9 287.9 343.4 -23.0

-9.5 -9.5

-336.7 -336.7 232.9 334.7 -38.0 -80.4 -297.9 129.0

+1.0 +1.0 -0.3 -0.6 +0.8 +8.9 -0.3 +2.7

-307.0 -307.0 254.4 349.0 -29.4

-5.7 -5.7 +8.9 +3.7 -22.0

+23.2 +2.0 -39.0

10 11 14 15 16

38.7

Change of sign

-

-

-357.1

+19.6

-332.7 +69.7 -59.0

+11.4 +44.5 +756.1

-

-

-6.9

-58.0

+741.1

-

-

Similar studies and calculations were carried out for truss No. 2 (Figs. 6, 7 and Table 2).