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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Fig. 5. Construction of the physical model of the truss.

The material for the truss is a 20×20×3 mm rolled angle made of A570 -36 steel. The base and loading schemes remained the same as for the full-scale truss. To analyze the behavior of a welded truss under loading, the experimental studies of its physical model on the STM-100 test complex were conducted (Fig. 6) using an original basing device, which enabled to implement the envisaged scheme of basing and loading the truss construction.

Fig. 6. Study of the physical model of a welded truss on the STM-100 test complex: sample before loading (a) and after destruction (b).

The range of test loads is from 0 to structure failure. It was found that the damage to the truss was caused by plastic deformation due to the loss of its stability in the loading plane. The construction lost its strength and collapsed. To build the deflection diagram of the physical model (Fig. 7, line A), the deflections of the lower chord in the middle of the truss were determined under different loads. To investigate the physical model of the truss, a computer simulation experiment was performed using the ANSYS Workbench 14.5 application software package, which is algorithmically based on finite element analysis. When developing the computer model of the welded truss, typical recommendations for constructions of this type were taken into account. The mechanical properties of A570-36 steel, which were determined experimentally, were used as the input information base. The parameters of the finite element model were optimized, a computer simulation experiment was performed, and a deflection diagram of the truss was obtained, similar to the one obtained by the full-scale experiment (Fig. 7, line B).

Fig. 7. Combined deflection diagrams of a physical model of a welded truss based on the results of full-scale (line A) and computer simulation (line B) experiments.