PSI - Issue 59

Bykiv N. et al. / Procedia Structural Integrity 59 (2024) 793–798 N.Bykiv et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 5. Crack propagation in RC beam with polymer couplers

3. Conclusions The development of 3D printing and materials makes it possible to create a structure or its element with specific characteristics. The use of couplings simplifies and reduces the cost of construction work, allowing you to connect classic rebar with rods made of functional, composite or other materials, without the use of welding, threading or crimping machines. Due to the significant decrease/increase in volume during cooling/heating compared to steel, polymer tubes do not require additional crimping methods. Due to its resistance to dynamic loads and bending, the PLA+ connection works perfectly as a plastic joint. Smooth beam fracture at the point of "weakening". Reinforcement and polymer couplings are intact. The "plastic hinge" works according to its intended development. Increasing the experience of using 3D printing in construction can simplify, speed up and improve the construction of buildings or the manufacture of structural elements. References Almeida, J. P. de, Steinmetz, M., Rigot, F., & de Cock, S. (2020). Shape-memory NiTi alloy rebars in flexural-controlled large-scale reinforced concrete walls: Experimental investigation on self-centring and damage limitation. Engineering Structures , 220 (April), 110865. https://doi.org/10.1016/j.engstruct.2020.110865 Azadi, M., Dadashi, A., Dezianian, S., Kianifar, M., Torkaman, S., & Chiyani, M. (2021). High-cycle bending fatigue properties of additive manufactured ABS and PLA polymers fabricated by fused deposition modeling 3D-printing. Forces in Mechanics , 3 , 100016. https://doi.org/10.1016/J.FINMEC.2021.100016 Azadpour, F., & Maghsoudi, A. A. (2020). Experimental and analytical investigation of continuous RC beams strengthened by SMA strands under cyclic loading. Construction and Building Materials , 239 , 117730. https://doi.org/10.1016/j.conbuildmat.2019.117730 Caminero, M. A., Chacón, J. M., García - Moreno, I., & Rodríguez, G. P. (2018). Impact damage resistance of 3D printed continuous fibre reinforced thermoplastic composites using fused deposition modelling. Composites Part B: Engineering , 148 , 93 – 103. https://doi.org/10.1016/J.COMPOSITESB.2018.04.054 Dizon, J. R. C., Espera, A. H., Chen, Q., & Advincula, R. C. (2018). Mechanical characterization of 3D-printed polymers. Additive Manufacturing , 20 , 44 – 67. https://doi.org/10.1016/J.ADDMA.2017.12.002 Elhadad, A. A., Rosa- Sainz, A., Cañete, R., Peralta, E., Begines, B., Balbuena, M., Alcudia, A., & Torres, Y. (2023). Applications and multidisciplinary perspective on 3D printing techniques: Recent developments and future trends. Materials Science and Engineering: R: Reports , 156 , 100760. https://doi.org/10.1016/J.MSER.2023.100760 Ibrahim, Y., Elkholy, A., Schofield, J. S., Melenka, G. W., & Kempers, R. (2020). Effective thermal conductivity of 3D-printed continuous fiber polymer composites . https://doi.org/10.1080/20550340.2019.1710023