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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Based on the modeling results, diagrams of the total elongation Δl (Fig. 11 , a) and deflection δ (Fig. 11, b) in the middle of the lower chord of the truss under different loads were constructed.

Fig. 11. Diagrams of the total elongation Δl (a) and deflection δ (b) in the middle of the lower chord of the truss under different lo ads.

The linear deformation along the elongation of the lower chord was found to be exhausted at a load of 560 kN. At the same time, normal stresses are formed in the material at the yield point of A570-36 steel, i.e., 273 MPa (see Table 1). Such strains are localized at 14.9 meters from the truss’s left (hingeless) support assembly (Fig. 9). The analysis of the deflection diagram δ in the middle of the lower chord at different loads shows that under the force effects at the level of 560 kN, a linear deflection deformation occurs, and such loads are not decisive for limiting the operating stresses. Fig. 12 shows the visualization of the deformation of a welded truss obtained by the computer simulation experiment at the load at the limit state level (560 kN).

Fig. 12. Visualization of the deformation of a welded truss obtained by a computer simulation experiment at the load at the limit state level.

The resulting visualization confirms the location of the maximum stresses obtained by calculation and makes it possible to understand the nature of the limit state for this structure. Based on the analysis of the location of the maximum stresses, a variant of strengthening the truss by fixing additional plates in this place was proposed (Fig. 13).

Fig. 13. Recommendations for strengthening the studied truss based on the computer simulation results.