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In order to explore the influence of SMA concrete beams with different proportions of SMA wires (unidirectional memory and hyperelastic) on the bearing capacity, five SMA concrete beams were made in this experiment. Twelve SMA wires with a diameter of 1mm were placed in the tensile zone of beams, which were reinforced according to different proportions of SMA. The experimental results show that: Within the range of 0-10kN (25% of the ultimate load of beams), the concrete beams with 70% hyperelastic SMA and 30% unidirectional memory SMA has the best stiffness. But in general, the concrete beams with 30% hyperelastic SMA and 70% unidirec-tional memory SMA has the best stiffness; After the first load, the concrete beams strengthened by SMA wires were heated to make the unidirectional memory SMA wires in the beams recover the deformation, and the second load was carried out. The results show that the beams bearing capacity can be improved when the SMA wires recover deformation after heating. The higher the SMA of unidirectional memory, the improvement of load bearing becomes better. However, it is necessary to adjust the proportion of the unidirectional memory SMA wires and the hyperelastic SMA wires to achieve the best effect on the stiffness and resilience of the beam.

Experimental study on self - reset properties of RC beams with different proportions of SMA wires