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Estudo do calor de hidratação do concreto massa e contribuição ao cálculo térmico e à previsão de fissuras de retração / Study of the heat of hydration of the concrete mass and contribution to the thermal calculation and the prediction of retraction cracksGambale, Patrícia Guedes 31 August 2017 (has links)
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Previous issue date: 2017-08-31 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / The advancement of concrete technologies and methods of structural calculation nowadays makes
buildings increasingly challenging, especially from the point of view of foundations. Foundation
blocks with great volumes need attention as to the fissures arising from the exothermic process of
hydration of the concrete, this concern defines the mixture as mass concrete, a widespread term in
the construction of dams and that has been gaining space in urban civil construction. This study
proposes the monitoring of prototypes of concrete blocks developed in the laboratory and
foundation block in the field, with the use of thermocouples comparing with numerical methods of
finite elements aiming to improve the prediction of cracks and to develop techniques so that they
are avoided. This study will analyze the influence of the type and consumption of cement in the
emergence of tensions arising from the energy released during its hydration. As results, a relation
of the type interference and cement consumption is presented through the monitoring and analysis
of the foundation block prototypes developed in the research, the development of a simplified
unidirectional model of temperature and voltage prediction due to the heat of hydration for to
evaluate the maximum temperature reached and the potential of cracking in the concrete mass and
the comparison between the temperature results obtained in the Ansys program, which uses three-
dimensional modeling and, as a way of validating the predictive model of thermal behavior as a
reliable tool of analysis, the study also presents a field monitoring of a foundation block of a
construction located in Goiânia and later application of the forecast model and the Ansys program.
It was found, therefore, that the cement type has a considerable influence on the compressive
strength and the adiabatic elevation, the latter being less significant. As for the cement
consumption analysis, there was a notable increase in temperature in the concrete with higher
consumption, causing cracks in the analyzed structure. By means of the results presented by the
Ansys program, the monitoring of the prototypes and block in the field and the proposed forecast
model, the validation of this model was confirmed as a good predictive tool of thermal behavior,
highlighting some limiting conditions that surround it. / O avanço das tecnologias do concreto e dos métodos de cálculo estrutural possibilita, nos dias
atuais, edifícios cada vez mais desafiadores, principalmente do ponto de vista das fundações.
Blocos de fundações de grandes volumes, definidos como concreto massa, carecem de
atenção quanto às fissuras advindas do processo exotérmico de hidratação do concreto, estapreocupação atualmente é bastante difundida na construção de barragens e que vem
ganhando espaço na construção civil urbana. Este trabalho propõe o monitoramento de
protótipos de blocos de concreto desenvolvidos em laboratório e bloco de fundação em
campo, com o uso de termopares comparando com métodos numéricos de elementos finitos
objetivando aprimorar a previsão de fissuras e desenvolver técnicas para que estas sejam
evitadas. O trabalho analisará a influência do tipo e consumo de cimento na liberação de calor
e no surgimento de tensões advindas da energia liberada durante sua hidratação. Como
resultados, são apresentados uma relação da interferência dos tipos e consumo de cimento
por meio do monitoramento e análise dos protótipos de blocos de fundação desenvolvidos na
pesquisa, o desenvolvimento de um modelo simplificado unidirecional de previsão de
temperatura e tensão devido ao calor de hidratação para avaliar a temperatura máxima
atingida e o potencial de fissuração no concreto massa e a comparação entre os resultados de
temperatura obtidos no programa Ansys, que utiliza modelagem tridimensional e, como forma
de validar o modelo preditivo do comportamento térmico como ferramenta confiável de
análise, o trabalho também apresenta um monitoramento em campo de um bloco de
fundação de uma obra localizada Goiânia e posterior aplicação do modelo de previsão e do
programa Ansys. Verificou-se, assim, que o tipo de cimento influencia de maneira
considerável na resistência à compressão e na elevação adiabática, sendo a última menos
significativa. Quanto a análise de consumo de cimento, verificou-se um aumento notável de
temperatura no concreto com maior consumo, ocasionando fissuras na estrutura analisada.
Por meio dos resultados apresentados pelo programa Ansys, o monitoramento dos protótipos
e bloco em campo e o modelo de previsão proposto, confirmou-se a validação do referido
modelo como boa ferramenta pretidiva de comportamento térmico, ressaltando algumas
condições limitantes que o cercam.
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Nosná konstrukce ŽB objektu pro lehký průmyslový provoz / Industrial building Load bearing RC structureVrána, Libor January 2014 (has links)
The Master´s thesis describes static analysis and design of reinforced concrete prefabricated of the production hall. Entering the work is to verify and dimension elements of structure.
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Montovaná hala s administrativní budovou / The prefabricated factory building with office blockKrejčová, Jana January 2014 (has links)
Master´s thesis describes the design and assessment of selected elements concrete factory building with office block, elaboration of shape and reinforcemenet drawings of selected structural prefabricated elements. The work also includes technical report and details of connection elements. Calculation was performed also using a computer program SCIA Engineer and Excel.
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Knihovna v Hluku / Library in HlukŠimková, Lucie January 2015 (has links)
This Diploma Thesis addresses the new building of the municipal library. Building has two floors and one basement. Operation of library is divided into public and private part. In the basement there are technical facilities, storage space and archive of books. In the first floor is space for the readers and coffee bar. In the second floor is study room, conference room and offices to ensure the operation of the library. All floors are equipped with sanitary facilities and room for staff. The building is covered with flat ply roof.
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Městská knihovna / City LibraryŽajdlík, Pavel January 2014 (has links)
This thesis addresses the new building of the municipal library on 3 floors. Operation of library is divided into public and private part. On the first floor there are dressing rooms, technical facilities, training rooms and spaces for commercial uses, such as a cafe and stationery. Storage spaces of library are using all floors and they are located in a separate wing. The main interest of readers is placed into the second and third floor, there are also offices to ensure the operation of the library. All floors are equipped with sanitary facilities for each building operation. The building is covered with flat roof.
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Nosná ŽB konstrukce objektu hotelu / Load bearing RC structure of hotel buildingMacourková, Klára January 2014 (has links)
The thesis deals with the static solution of monolitic reinforced concrete concstruction of hotel building. Subject of the solutions is reinforced concrete monolithic point – supported ceiling slab, columns, foundations and staircase. Assesment of these structures by the first ultimate state – carrying capacity.
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