Análise numérica em elementos finitos para laje de concreto protendido utilizando modelos constitutivos não lineares

• Ano de defesa: 2015
• Autor(a) principal: Bárbara Weidig Gallo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Análise não linear; Concreto protendido; Modelo; Elementos finitos; Protensão; Lajes de concreto; Engenharia de estruturas; Método dos elementos finitos
• Link de acesso: http://hdl.handle.net/1843/BUBD-A39GX9

This study was motivated by the need for exploration and further development on research related to nonlinear analysis of prestressed concrete, not only by the lack of studies on the subject, but also by the importance that this material plays in structural engineering nowadays. A numerical analysis was performed with alveolar slab of prestressed concrete using nonlinear constitutive models for steel and concrete, taking into account the effects of creep and shrinkage of the concrete and the relaxation of the steel. In addition, differences were verified in the strains obtained from experimental tests and computational model developed in the commercial platform SAP 2000®. In order to make the comparison possible, all the data measured in the experimental assay were entered into the model, allowing the nonlinear analysis of prestressed cellular concrete slab in the computer program. The results are shown and discussed, through tables and comparative graphs in which it is possible to see the differences between the experimental test and the model. High discrepancies were verified at the beginning and the end of the simulation, probably due to the difficulty of measuring the displacements and due to the presence of cracks and damage in the end structure. On the other hand, the simulation model captured the trend of increase in displacement over time observed in the experimental slab behavior within the period of age of 36 to onset age of 58 days. It is proposed that further studies be undertaken to expand the comparison conditions in nonlinear analysis of prestressed concrete.