NAJM, H. B. Flexural Behavior of Two-layers Reinforced Concrete Beams. Polytechnic Journal, [S. l.], v. 12, n. 2, p. 180-192, 2023. DOI: 10.25156/ptj.v12n2y2022.pp180-192. Disponível em: https://journals.epu.edu.iq/index.php/polytechnic/article/view/788. Acesso em: 28 apr. 2024.