Análise Térmica De Alvenaria Estrutural Em Situação De Incêndio: Um Estudo Do Gradiente Térmico

Rodovalho, Francielle da Silva; Simões, Yagho de Souza; Corrêa, Márcio Roberto Silva

doi:10.20906/cps/cilamce2017-0561

Cited by 3 publications

(4 citation statements)

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“…For the mortar joints, the values of specific heat, thermal conductivity and specific mass (Figure 7b) were those tabulated in previous papers [21,43]. For the BC1 and PC1 models, data reported by Incropera and DeWitt [44] was used to define the specific heat, thermal conductivity, and specific mass of the air (Figure 7c) inside the hollows of concrete blocks and prisms.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Values of specific heat, thermal conductivity and specific mass of the concrete units (Figure 7a) were those tabulated in EN 1992-1-2 [42] for dry normal-weight concrete with siliceous aggregates. For the mortar joints, the values of specific heat, thermal conductivity and specific mass (Figure 7b) were those tabulated in previous papers [21,43]. For the BC1 and PC1 models, data reported by Incropera and DeWitt [44] was used to define the specific heat, thermal conductivity, and specific mass of the air (Figure 7c) inside the hollows of concrete blocks and prisms.…”

Section: Numerical Analysismentioning

confidence: 99%

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Thermal Analysis of Concrete Blocks and Stack-Bond Prisms under Different Boundary Conditions

Nalon,

Ribeiro,

Pedroti

et al. 2024

Construction Materials

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Fire is a significant threat to human lives and the integrity of buildings. To better understand the complex behavior of masonry exposed to high temperatures, thermal analyses were carried out to evaluate the temperature distribution in concrete blocks and stack-bond prisms exposed to high temperature levels. The effects of distinct specimen boundary conditions (restrict or easy access to air circulation inside the voids of the block and prisms) on the thermal response of the masonry materials were investigated. Thersys 2.0 software was used to implement three-dimensional thermal analysis of distinct finite element models. Four-node tetrahedral elements and full integration were used in all models. The modeling approach was validated by experimental data obtained from thermocouples embedded into masonry components. The results indicated that the boundary conditions significantly affected the time required for homogenization of temperature in blocks and prisms. Easy access to air circulation inside the voids of the prisms provided a faster temperature homogenization. In this scenario, the prism reached temperature ranges of (300 ± 0.5% × 300) °C and (600 ± 0.5% × 600) °C after exposure times of 2 h and 2 h 10 min, respectively. When access to air circulation within the voids of the prisms was limited, the same temperature ranges were achieved after exposure times of 5 h 20 min and 6 h, respectively.

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Section: Numerical Analysismentioning

confidence: 99%

Section: Numerical Analysismentioning

confidence: 99%

Thermal Analysis of Concrete Blocks and Stack-Bond Prisms under Different Boundary Conditions

Nalon,

Ribeiro,

Pedroti

et al. 2024

Construction Materials

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“…The specific mass of the mortar was calculated from the mass proportion available in Oliveira [12], obtaining a value of 2180 kg/m³. The thermal properties of the mortar required for the modelling, such as specific heat and thermal conductivity, were adopted as available in Rodovalho, Simões and Corrêa [18]. In the air mass, internal to the cavities, an initial temperature of 17 °C was also applied and a total of 9360 solid elements of the FC3D8 "fluid" family, with dimensions of approximately 1 cm were used.…”

Section: Thermal Simulation Characteristicsmentioning

confidence: 99%

Thermal simulation of prisms with concrete blocks in a fire situation

Rodovalho

Corrêa

2019

Rev. IBRACON Estrut. Mater.

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ResumoThe purpose of the current study is to verify the thermal insulation capacity of concrete block masonry in a fire situation through the thermal simulation of prisms. Initially, a prism with mortar coating on the face exposed to fire was numerically simulated and compared to experimental results provided by a company in order to validate the block thermal properties. To represent air in the block cavities, fluid-structure interaction was used in ABAQUS software. The uncoated and mortar-coated prisms on both sides were analyzed in a fire situation. The thermal insulation of the uncoated prism was maintained for more than 60 minutes and with the application of coating on both faces there was an increase of 59% of this time. The thermal fields were generated, thus leading to future thermomechanical analysis.O presente trabalho tem como objetivo verificar a capacidade de isolamento térmico de alvenarias constituídas por blocos de concreto em situação de incêndio por meio da simulação térmica de prismas. Inicialmente, para a validação das propriedades térmicas do bloco com um experimento fornecido por uma empresa, foi simulado um prisma com revestimento em argamassa na face exposta ao incêndio. Para representar o ar presente nas cavidades dos blocos foi utilizada a interação fluido-estrutura no software ABAQUS. Verificaram-se os casos de prisma sem revestimento e com revestimento em argamassa nas duas faces, em situação de incêndio. O isolamento térmico do prisma sem revestimento foi mantido por mais de 60 minutos e com a aplicação de revestimento nas duas faces do prisma ocorreu um aumento de 59% em relação a esse tempo. Os campos térmicos foram gerados possibilitando futuras análises termomecânicas.Palavras-chave: blocos de concreto, alvenaria estrutural, elevadas temperaturas, isolamento térmico, análise numérica.

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“…Por outro lado, a alvenaria estrutural, apesar de largamente utilizada por projetistas como sistema construtivo, ainda é deficitária de dados sobre seu comportamento a temperaturas elevadas. Entretanto, observa-se nos últimos anos um maior número de trabalhos nacionais neste tema focados em alvenaria estrutural (ROSEMANN, 2011;RIGÃO, 2015;LEITE et al, 2016;DÉSIR e ZANIN, 2017;RODOVALHO et al, 2017;RODOVALHO e CORRÊA, 2019, LIMA et al, 2018 A maioria dos ensaios de paredes em escala real ou mesmo pequenas paredes requerem equipamentos de grande porte, para simular o carregamento do qual o elemento estará submetido em obra, possuem relativa complexidade de construção dos corpos de prova e têm custo elevado para sua execução. Desta forma, ensaios de prismas cerâmicos tornaram-se a principal forma para avaliação de alvenarias.…”

Section: Introductionunclassified

Desempenho Mecânico De Alvenaria Estrutural Cerâmica E Seus Componentes Em Temperaturas Elevadas / Mechanical Performance of Ceramic Structural Masonry and Its Components at Elevated Temperatures

Rigão

Fagundes

Grotto

et al. 2021

BJD

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Análise Térmica De Alvenaria Estrutural Em Situação De Incêndio: Um Estudo Do Gradiente Térmico

Cited by 3 publications

References 0 publications

Thermal Analysis of Concrete Blocks and Stack-Bond Prisms under Different Boundary Conditions

Thermal Analysis of Concrete Blocks and Stack-Bond Prisms under Different Boundary Conditions

Thermal simulation of prisms with concrete blocks in a fire situation

Desempenho Mecânico De Alvenaria Estrutural Cerâmica E Seus Componentes Em Temperaturas Elevadas / Mechanical Performance of Ceramic Structural Masonry and Its Components at Elevated Temperatures

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