Implementação computacional de modelos constitutivos para juntas de argamassa de estruturas de alvenaria no ANSYS

• Autor(a) principal: Silva, Carolina Rocha Fortes da
• Data de Publicação: 2020
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/17365
• topic: Civil engineering; Masonry; Joints (Engineering); Finite element method; Engenharia civil; Alvenaria; Juntas (Engenharia); Método dos elementos finitos; ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS

Both experimental and numerical results are important to better understand the behavior of structures, since they may provide useful information for the improvement of design, building and repair processes. In the case of structural masonry, which is a composite material with strong anisotropy and non-linear behavior due to its mortar joints, the panel response for a given load depends on its dimensions, the presence of openings such as windows and doors, and the unit and mortar properties. In this sense, numerical simulations may be used to investigate the behavior of a variate of panel configurations. The modeling of a masonry panel differs significantly from the process of modeling concrete or steel structures due to the complex behavior of the composite material. Deformation and failure properties depend on both the stress orientation and the joint direction, since the horizontal joints act as weak surfaces. The simplified micromodeling approach is one of the several strategies that have been proposed for the numerical analysis of masonry panels in the frame of the Finite Element Method. This approach makes use of zero-thickness interface elements to represent joints and simulate their sliding and opening behavior with appropriate constitutive models. This work analyzes the behavior of structural masonry panels by using the simplified micromodeling approach with the application of the Finite Element Method software ANSYS. A plasticity constitutive model for the mortar joints could be investigated – a Mohr Coulomb envelop with tension cut-off and compressive cap with hardening. The corresponding algorithms were implemented into an ANSYS user material subroutine, by employing an implicit scheme using the return mapping algorithm. Numerical results were compared to reference results available in literature. Finally, some advantages, disadvantages and limitations of the employed modelling approach could be confirmed.