Influência das bainhas na resistência das almas das vigas de concreto protendido

• Ano de defesa: 1978
• Autor(a) principal: Fairbairn, Eduardo de Moraes Rego
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia Civil; UFRJ
• Palavras-chave em Português: Vigas; Concreto protendido; Alma (estruturas); Fadiga dos materiais; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS
• Link de acesso: http://hdl.handle.net/11422/2905

CEB Recommendations preconize that in case of verification of the web strength of the prestressed concrete bearns against the shear force, it might be taken into account the effective web thickness (by deduction of the half sum of the ducts diameters) in the considered region (bwef = bw - 1/2 ∑Ф). With the purpose of verifying this recommendation, fifteen reinforced concrete beams were tested until the crushing of the concrete web, in the direction of the diagonal cracks. The beams had the same geometrical charactheristics and the sarne transversal and longitudinal reinforcement. The variable parameters were the diameters of the ducts and their injection, or not, with mortar. We have concluded that in the cases in which the injection is reliable, a reduction of the value of the web thickness would not be necessary, and that in the cases in which the full efficiency of the injection cannot be trusted, the reduction preconized by CEB-1978 (bwef=bw-1/2∑Ф) is recommended.