Modelagem de pórticos em concreto armado preenchidos com alvenaria participante

• Autor(a) principal: Rigão, Alessandro Onofre
• Data de Publicação: 2022
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Manancial - Repositório Digital da UFSM
• Texto Completo: http://repositorio.ufsm.br/handle/1/24212
• topic: Alvenaria participante; Pórticos preenchidos; Estruturas de concreto; Análise estrutural; Participating masonry; Infilled frames; Concrete structure; Structural analysis; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL

In framed systems, the masonry has the main role of sealing, however there is the knowledge of its contribution to the lateral stiffness and stresses distribution between the structural elements. Despite this understanding, it is not usual, the structural design taking into account the walls as part of bracing system of building. There are international standards that consider the walls influence in resistance gain and stiffness to horizontal loads, but normally they are applicable to frames with one story and one span. The approach for national standard to a frame-masonry system is recent, there are yet some doubts by designs to its implementation. The simplest model able to account the masonry as integral part of structure in framed systems is through the wall simulation as single diagonal strut, known as Equivalent Strut Model. This method usually has good results for global analysis of structure, however for the assessment of local effects, it is deficient. In this case, models with multi-struts or analyses through finite elements are more suitable. The behavior of reinforced concrete frames infilled with masonry was assessed which they were subjected to horizontal loads. The results were sought that could serve as parameters to be used by designers for structural design aid. For this purpose, it was evaluated the shearing forces and bending moments in lower beam and left columns, besides lateral displacement. Numerical simulations through Finite Element Method (FEM) were performed whose stresses and displacements were considered as reference. Multistruts models with two and three parallel struts, besides two crossed struts were proposed. The values were compared in relation to plane models and classic models of single strut. In the assessed frames, it was seen that the single struts models were inappropriate for evaluation of shearing forces. The models with two crossed struts showed good estimation for maximum shearing force due to interaction masonryframe. Models with two parallel struts were more appropriated in predicting the bending moment in the most critical sections due to horizontal loads. The most models with proposed multi-struts led to good estimation for lateral displacement. In this case, the models with single struts also produced satisfactory results.