Behavior of clay hollow-brick masonry walls during fire. Part 1: Experimental analysis

Nguyen, Thê-Duong; Meftah, Fékri

doi:10.1016/j.firesaf.2012.06.001

Cited by 52 publications

(50 citation statements)

References 10 publications

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“…On sample A2, there was spalling of the mortar coating approximately on 32 percent of the area of the face exposed to fire, in the mid-inferior partition. It is the most possible cause of the increase in the exterior temperature of the sample, as referenced by Nguyen and Meftah (2012). It is also observed that there was no stabilization of the temperature of the non-exposed face, referred to above and occurred in system A1, impairing the thermal insulation over time by failure of adhesion of the coating to the substrate.…”

Section: Fire Resistancementioning

confidence: 95%

“…The walls promote an essential compartmentalization to the building, proportioning security in the evacuation route, depending directly on the performance of the bricks and the coating system. The coating system protects the bricks from the direct incidence of the fire, increasing the fire resistance of the system (BUCHANAN; MUNUKUTLA, 1991; BRETANO, 2004; ONO, 2007; NGUYEN; MEFTAH, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of fire resistance and acoustic performance of ceramic brick walls in concern to NBR 15575 in residential buildings in Brazil

Klippel-Filho¹,

Prager²,

Silva³

et al. 2018

DYNA

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After the publication of NBR 15575 (ABNT, 2013) standard, it became necessary that the constructive systems used in residential buildings go through verification processes concerning the performance requirements. Considering the security requirements, it is necessary to evaluate the fire resistance of vertical sealing systems. Within the scope of habitability, the standard specifies that these systems must have an adequate acoustic performance. Regarding this scenario, this study has the purpose of evaluate the performance of two non-structural vertical sealing systems in ceramic bricks by comparing two different layouts of horizontal air gaps. Therefore, laboratory tests were performed, following the prescriptions of NBR 10636 (ABNT, 1989) and ISO 10140-2 (ISO, 2010). It was verified that the system with higher air gaps number had a better performance on fire resistance, and that the acoustic performance was very similar between the two systems.Keywords: laboratory test; vertical sealing systems; acoustic performance; fire resistance; ABNT NBR 15575-4:2014.Estudio comparativo de resistencia al fuego y desempeño acústico de paredes en bloques cerámicos en cuestión de NBR 15575 en edificios residenciales de Brasil Resumen Con la publicación de la norma NBR 15575 (ABNT, 2013), ha sido necesario que los sistemas constructivos utilizados en edificios residenciales se sometiesen a ensayos para el cumplimiento de los requisitos de desempeño. En el ámbito de los requisitos de seguridad solicitados por la norma, existe la necesidad de la evaluación de la resistencia al fuego de los sistemas de aislamiento vertical. Dentro de la habitabilidad, la norma recomienda que estos sistemas tienen un desempeño acústico adecuado. Dentro de este escenario, el objetivo de este trabajo es evaluar el desempeño acústico de dos sistemas de pared compuestos por diferentes tipos de bloques cerámicos con agujeros horizontales. Para este análisis, fueron realizados ensayos de laboratorio de acuerdo con las normas NBR 10636 (ABNT, 1989) y ISO 10140-2 (ISO, 2010). Se verificó que el sistema con mayor densidad presentó desempeño sensiblemente mejor acerca la resistencia al fuego, con desempeño prácticamente idéntico en el análisis del aislamiento acústico.Palabras clave: ensayos de laboratorio; sistema de aislamiento vertical; desempeño acústico; resistencia al fuego; ABNT NBR 15575-4:2014.

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Section: Fire Resistancementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Comparative study of fire resistance and acoustic performance of ceramic brick walls in concern to NBR 15575 in residential buildings in Brazil

Klippel-Filho¹,

Prager²,

Silva³

et al. 2018

DYNA

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“…RUSSO e SCI-ARRETTA [23] apresentaram um esquema de uma parede carregada com a extremidade inferior engastada e a superior com engaste móvel, possibilitando o deslocamento vertical do topo da parede. NGUYEN e MEFTAH [24] utilizaram em seus experimentos uma viga para a distribuição dos esforços gerados por células de carga fixas horizontalmente. Os autores não apresentaram informações sobre a restrição rotacional.…”

Section: Simulações Termomecânicasunclassified

Simulação termomecânica de prismas com blocos de concreto em situação de incêndio

2020

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RESUMO Incêndios em edificações são frequentes em todo o mundo. Um sistema construtivo amplamente empregado no Brasil e pouco estudado em situação de incêndio é a alvenaria estrutural constituída por blocos de concreto. Em temperatura ambiente pode-se estimar a resistência à compressão axial da alvenaria através da compressão axial de prismas. Além disso, por meio de prismas é possível representar a perda de resistência mecânica devida à deterioração térmica. Assim, o presente trabalho tem como objetivo analisar, em contexto puramente numérico, a resistência mecânica de prismas constituídos por blocos de concreto submetidos à compressão e em situação de incêndio, por meio de simulação termomecânica. Inicialmente, foi simulado um prisma sob compressão à temperatura ambiente com o intuito de validar as propriedades dos materiais nessa condição. Posteriormente, em elevadas temperaturas, foram empregadas propriedades encontradas na literatura técnica. As condições de contorno foram variadas, aplicaram-se dois níveis de carregamento e verificaram-se os casos de prisma com uma e duas faces expostas ao incêndio. Nas simulações numéricas, a aplicação de um nível maior de carregamento, a restrição de deslocamento vertical e a exposição ao incêndio de duas faces antecipou a ruptura do prisma. A falta de restrição rotacional gerou um modo de ruptura diferente do caso com restrição rotacional e em tempo inferior de exposição ao fogo. O emprego de propriedades encontradas na literatura técnica levou a um resultado de tempo de resistência mecânica favorável à segurança.

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“…Moreover, the moist material is also known to have a good fire performance [3]. Notwithstanding that sintered clay bricks are commonly used in the manufacturing step of civil engineering, structural wall elements are made up of the connection between bricks and conventional mortar [4]. The density of mortared brick walls with high water content can be as high as 2000 kg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

“…However, these methods have several limitations. For example, semi-empirical methods often require design of structural elements, incur additional costs, and provide limited design flexibility in terms of fire resistance requirements [4].…”

Section: Introductionmentioning

confidence: 99%

The Investigation of Heat Performance and Thermal Conductivity of Different Wall Materials at High Temperatures

Görhan

Kürklü

2018

SDÜ Fen Bil Enst Der

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Abstract:The current study investigated heat transfers at high temperatures and compressive strength after exposure to high temperatures of gas concrete, clay brick, rice husk bricks used as wall materials, and gypsum plaster and common plaster used as coating materials. Tests measuring apparent porosity, water absorption, bulk density and compressive strength were performed on the samples prepared in 100 mm x 100 mm x 100 mm size. In the high-temperature experiment, the samples with K-type NiCr-Ni thermocouple were placed in a specially designed laboratory furnace. The internal temperature of the furnace was set at 800 o C. The researchers found that out of the samples exposed to high temperatures compressive strength and thermal conductivity of the gypsum plaster mortar were better than those of the common plaster mortar. Furthermore, the gas concrete, a wall material, was found to have a low thermal conductivity. As a result, the gas concrete and common plaster mortar, which were exposed to high temperature, were found to be more durable than other materials and, therefore, more advantageous when used in construction.

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Behavior of clay hollow-brick masonry walls during fire. Part 1: Experimental analysis

Cited by 52 publications

References 10 publications

Comparative study of fire resistance and acoustic performance of ceramic brick walls in concern to NBR 15575 in residential buildings in Brazil

Comparative study of fire resistance and acoustic performance of ceramic brick walls in concern to NBR 15575 in residential buildings in Brazil

Simulação termomecânica de prismas com blocos de concreto em situação de incêndio

The Investigation of Heat Performance and Thermal Conductivity of Different Wall Materials at High Temperatures

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