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Publications (20)
ABSTRACT Adequate cover thickness contributes to the correct performance of reinforced concrete structures. Spacers are recommended in standards to maintain a concrete cover; however, many regulations do not provide sufficient guidelines for their use, resulting in poor construction. A research program was developed for solid slabs through computat...
Considering construction costs, predicted service life, and related environmental impacts, this paper evaluates the influence of varied concrete cover thicknesses in the life cycle of a reinforced concrete structure. Environmental impacts and costs of a structural element (slab) are evaluated using Life Cycle Assessment (LCA) and Life Cycle Costs (...
Este artigo versa sobre a influência da resistência à compressão do concreto (fck) adotada em projeto, quanto aos quantitativos, custos de material e custo global da superestrutura, objetivando apontar a solução mais vantajosa economicamente para a edificação em questão e cenário atual. A comparação entre os projetos foi focada em alterações na res...
Resumo Para estruturas de concreto armado, a proteção das armaduras é fator fundamental para atingir o desempenho, e isso se dá através da qualidade do concreto e da espessura do cobrimento. Pesquisas apontam negligências quanto à especificação do cobrimento e a ineficácia dos procedimentos de execução. Como resultado, espessuras inadequadas são ca...
Prefácio:
Esta publicação apresenta resultados obtidos pela rede de pesquisa INOVATEC que envolveu a participação de dez instituições tecnológicas brasileiras selecionadas na Chamada Pública MCT/MCidades/Finep/Ação Transversal Saneamento Ambiental e Habitação 07/2009, Área Habitação, com o Tema Prioritário de desenvolvimento de métodos de ensaio...
This work analyses the methodology "A" (item A.4) employed by the Brazilian Standard ABNT 8522 (ABNT, 2008) for determining the stress-strain behavior of cylindrical specimens of concrete, presenting considerations about possible enhancements aiming it use for concretes with recycled aggregates with automatic test equipment. The methodology specifi...
This paper proposes an assessment technique for the structural safety of anchored concrete panels after anchor ruptures. The methodology was developed using anchored panels located in Gramado-RS, Brazil, where 41 anchors ruptured at different positions. Being the original project of the panels known, their structural safety was evaluated using a fi...
The durability of reinforced concrete structures is highly dependent on the characteristics of the concrete cover to reinforcement and its thickness. The failure to obtain cover thickness is the factor with the largest influence on the premature corrosion of the reinforcement, which in turn is the main deterioration form of reinforced concrete stru...
Given that the durability of structures is directly related to the thickness of the cover to reinforcement, it is essential to ensure minimum cover is achieved when building a structure. However, studies show that this is not always the case. One of the reasons for the this problem is the lack of indication, in structural projects, of the positioni...
Espaçadores são essenciais na execução de estruturas de concreto armado e protendido, pois são os responsáveis pelo correto posicionamento das armaduras, garantindo assim, o cobrimento das mesmas. Uma vez que a durabilidade das estruturas está diretamente relacionada à espessura de cobrimento do aço, é imprescindível que o cobrimento projetado seja...
The aim of this study is to assess the strength controlling parameters of a sandy soil (Botucatu residual soil (BRS)) treated with industrial by-products (basaltic powdered rock (PR) or coal fly ash (FA)) and lime, as well as to show that the porosity/volumetric lime content (η/Lv) plays a fundamental role in the assessment of the target strength....
Nowadays, the use of modular systems in the construction industry has grown substantially in Brazil, and, among them, the structural masonry system stands out. However, several studies point out the high incidence of pathological manifestations related to this system, being the interface between masonry and windows one of the places with the highes...
This work presents some observations about the use of didactic games involving practical activities of design and building of structures, complementing subjects of Structural Analysis and Solid Mechanics broached in regular classes. The practical activity proposed to the undergraduate students of several engineering and architecture courses is a lo...
A numerical procedure that employs the finite element method and the state variables approach is proposed to analyse the critical condition of a crack in an aging viscoelastic body under sustained load. A far field solution proposed by Schapery is used. An example shows how a crack can become critical after some finite time that depends on the char...
A numerical procedure based on the finite elements method and Schapery's
formulation is proposed to determine the critical condition of cracks
in viscoelastic structures. Some initial results trying to couple
fracture mechanics with continuum damage mechanics also are presented.
