PSI - Issue 72

Serhii Drobyshynets et al. / Procedia Structural Integrity 72 (2025) 210–215

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= 327×10⁻⁵; the beam deflections were f = 11.2 mm and f = 11.6 mm under concentrated forces, and f = 13.1 mm at mid-span. The cause and nature of beam B-3 failure were similar to those of beam B-2. The beam failed along a normal cross section due to the reinforcement reaching its ultimate strain. The crack development trend was also similar for both beams. 4. Conclusions 1. The features of the behavior of steel fiber reinforced concrete beams under short-term and low-cycle loading are presented; 2. the failure of steel fiber reinforced concrete beams occurred along normal cross-sections gradually, due to the reinforcement reaching its ultimate strain, without significant crushing or spalling of the compressed zone; 3. the stabilization of compression deformations in steel fiber reinforced concrete, tensile deformations in the reinforcement, and beam deflections at η < 0.75 occurs within 5 – 7 loading-unloading cycles; 4. an increase in the load level in certain cycles disrupts the stabilization of deformations established in previous cycles, leading to significant residual deformations that depend on the additional load level; 5. compared to conventional reinforced concrete beams, cracks in steel fiber reinforced concrete beams occur more frequently along the length, but their width and the magnitude of deflections are significantly smaller; 6. the characteristics of crack formation in the studied beams have been analyzed. 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