The object of research is reinforced concrete beams with combined reinforcement. The improvement of their crack resistance is essential because crack propagation reduces the durability of structures, and conventional methods of crack closure are not always effective. Method. The study employs an experimental method involving four-point bending tests on specimens with additional heat-activated polycaprolactone rods. Results. The study found that after heat activation, the crack width in the modified beams was more than halved compared to control specimens, and the deflection value decreased by 16%. These results demonstrate the potential of using shape memory polymer elements to control the deformation state of reinforced concrete structures and improve their performance.

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