Análise comparativa de um edifício projetado em estrutura mista aço-concreto e concreto armado pré-fabricado
Carregando...
Data
2022-12-08
Autores
Orientador
Schmitz, Rebeca Jéssica
Banca
Velho, Douglas Ferreira
Carini, Matheus Roman
Título do periódico
ISSN
Título do Volume
Editor
Resumo
Devido à necessidade de otimizar a execução de estruturas, os sistemas pré-fabricados vêm adquirindo espaço na construção civil. A fim de analisar diferentes modelos de construção, o presente trabalho propõe uma comparação entre os sistemas em estrutura mista aço-concreto e em concreto armado pré-fabricado para um edifício comercial de quatro pavimentos. Após a definição do desenho arquitetônico, a planta foi modulada em vãos equivalentes, fazendo com que houvesse uma grande similaridade entre os elementos estruturais, contemplando a proposta do trabalho. Por meio de planilhas eletrônicas no software Excel e modelos matemáticos no Ftool, foi realizado o dimensionamento estrutural dos dois modelos, definindo as seções transversais das vigas e pilares da edificação. No caso das lajes, escolhidas como mista steel deck e alveolar protendida, sua altura foi definida a partir de informações fornecidas por cada fabricante, considerando que seriam entregues prontas no local da obra. Após o dimensionamento, os modelos foram comparados em relação aos custos por meio de orçamentos elaborados utilizando o SINAPI, indicando valores apenas para os insumos necessários para a produção das peças, portanto, os custos referentes à mão-de-obra não foram considerados. Dessa forma, o modelo misto aço-concreto apresentou um custo de R$ 548.590,73, contemplando aço para vigas e pilares, conectores de cisalhamento, concreto e armaduras para os pilares, além das lajes steel deck. Enquanto o modelo em concreto pré-fabricado teve um custo final de R$ 359.385,12, para o concreto e as armaduras das vigas e pilares, além das lajes alveolares. Para essa análise de materiais, observou-se uma diferença de cerca de 53%, concluindo que os materiais da estrutura pré-fabricada seriam mais viáveis economicamente, fato justificado principalmente pelos pilares mistos, que possuem um alto custo de produção. Entretanto, deve-se considerar que, nos perfis metálicos, o custo de mão de obra já está incluído na sua produção, enquanto nas peças pré-fabricadas isso não ocorre. Também realizou-se uma análise de peso para transporte da estrutura, na qual o modelo misto mostrou-se mais viável, com uma diferença na ordem de 6,6 vezes em relação à estrutura pré-fabricada.
Due to the need to optimize the execution of structures, prefabricated systems have been gaining ground in civil construction. In order to analyze different construction models, this work proposes a comparison between systems in mixed steel-concrete structure and in prefabricated reinforced concrete for a commercial building with four floors. After defining the architectural design, the plan was modulated into equivalent spans, resulting in a great similarity between the structural elements, contemplating the work proposal. Using spreadsheets in Excel software and mathematical models in Ftool, the structural design of the two models was carried out, defining the cross sections of the beams and pillars of the building. In the case of the slabs, chosen as a mixed steel deck and prestressed hollow core, their height was defined based on information provided by each manufacturer, considering that they would be delivered ready-made to the work site. After sizing, the models were compared in terms of costs through budgets prepared using SINAPI, indicating values only for the inputs necessary for the production of parts, therefore, costs related to labor were not considered. Thus, the mixed steel-concrete model presented a cost of R$ 548,590.73, including steel for beams and pillars, shear connectors, concrete and reinforcement for the pillars, in addition to the steel deck slabs. While the prefabricated concrete model had a final cost of R$ 359,385.12, for the concrete and the reinforcement of the beams and pillars, in addition to the hollow core slabs. For this material analysis, a difference of about 53% was observed, concluding that the materials of the prefabricated structure would be more economically viable, a fact mainly justified by the composite pillars, which have a high production cost. However, it should be considered that, in metallic profiles, the cost of labor is already included in its production, while in prefabricated parts this does not occur. A weight analysis was also carried out for transporting the structure, in which the mixed model proved to be more viable, with a difference in the order of 6.6 times in relation to the prefabricated structure.
Due to the need to optimize the execution of structures, prefabricated systems have been gaining ground in civil construction. In order to analyze different construction models, this work proposes a comparison between systems in mixed steel-concrete structure and in prefabricated reinforced concrete for a commercial building with four floors. After defining the architectural design, the plan was modulated into equivalent spans, resulting in a great similarity between the structural elements, contemplating the work proposal. Using spreadsheets in Excel software and mathematical models in Ftool, the structural design of the two models was carried out, defining the cross sections of the beams and pillars of the building. In the case of the slabs, chosen as a mixed steel deck and prestressed hollow core, their height was defined based on information provided by each manufacturer, considering that they would be delivered ready-made to the work site. After sizing, the models were compared in terms of costs through budgets prepared using SINAPI, indicating values only for the inputs necessary for the production of parts, therefore, costs related to labor were not considered. Thus, the mixed steel-concrete model presented a cost of R$ 548,590.73, including steel for beams and pillars, shear connectors, concrete and reinforcement for the pillars, in addition to the steel deck slabs. While the prefabricated concrete model had a final cost of R$ 359,385.12, for the concrete and the reinforcement of the beams and pillars, in addition to the hollow core slabs. For this material analysis, a difference of about 53% was observed, concluding that the materials of the prefabricated structure would be more economically viable, a fact mainly justified by the composite pillars, which have a high production cost. However, it should be considered that, in metallic profiles, the cost of labor is already included in its production, while in prefabricated parts this does not occur. A weight analysis was also carried out for transporting the structure, in which the mixed model proved to be more viable, with a difference in the order of 6.6 times in relation to the prefabricated structure.
Descrição
Palavras-chave
Estrutura mista aço-concreto; Concreto armado pré-fabricado; Dimensionamento estrutural; Edifício comercial; Mixed steel-concrete structure; Prefabricated reinforced concrete; Structural dimensioning; Commercial building
Citação
VALENTIN, Thaís Fernanda. Análise comparativa de um edifício projetado em estrutura mista aço-concreto e concreto armado pré-fabricado. 2022. Monografia (Graduação em Engenharia Civil) – Universidade do Vale do Taquari - Univates, Lajeado, 08 dez. 2022. Disponível em: http://hdl.handle.net/10737/3484.