Influence of stiffness related to the c40 strength class of the hardwood group established by the brazilian standard in the design of timber structures - Lahr, Francisco Antonio Rocco; Aquino, Vinicius Borges de Moura; Arroyo, Felipe Nascimento; Santos, Herisson Ferreira dos; Silva, Sergio Augusto Mello; Wolenski, Anderson Renato Vobornik; Carvalho, Carlos Maviavel de; Almeida, João Paulo Boff; Christoforo, André Luis (Wood Research, 2021)