Effect of radiation inside square hollow section under moderate non-symmetric fire

Bączkiewicz, Jolanta; Pajunen, Sami; Heinisuo, Markku

doi:10.4081/fire.2018.42

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…This, in turn, causes the temperature of the steel material to rise, consequently leading to an increase in the temperature of the trapped gas within the tubular steel member. The time lag between the temperature of the steel profile and the internal gas is negligible [24]. The primary factor contributing to the increase in overpressure ∆P is linked to the rise in gas temperature θ partially counterbalanced by the expansion of volume V 1 .…”

Section: Gas Pressure Inside the Steel Hollow Profilesmentioning

confidence: 99%

Influence of Internal Pressure on Hollow Section Steel Members in Fire

Kervalishvili,

Talvik

2023

Applied Sciences

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Structural steel hollow section members are extensively utilized in civil engineering due to their excellent mechanical performance, favourable geometry for corrosion protection, and aesthetic appeal. Degradation in material properties of steel and thermal expansion at high temperatures must be regarded in designs for fire situations. The closed inner space of hollow sections presents challenges at elevated temperatures. The present study examines the effect of expanding air on the stress state in section walls of hermetically sealed circular and rectangular hollow sections. The effect of the gas pressure is calculated analytically and numerically. The pressure of the expanding air may substantially reduce the capacity of a tubular member. The influence on resistance depends on temperature, volume of the air in the tubular member, and geometry of the hollow section. The results of the study indicate that rectangular hollow sections with relatively large width-to-thickness ratios are more sensitive to internal pressure than circular hollow sections. The temperature range where the adverse effect of internal pressure occurs can include realistic critical temperatures in practical design and therefore deserve special attention to ensure the required safety.

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Section: Gas Pressure Inside the Steel Hollow Profilesmentioning

confidence: 99%

Influence of Internal Pressure on Hollow Section Steel Members in Fire

Kervalishvili,

Talvik

2023

Applied Sciences

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“…A 50 mm mesh size was used in all the simulations. Baczkiewicz et al (2018) presented the effect of radiation inside hollow sections under moderate non-symmetric fire. In case of a non-symmetric fire, the fire does not affect all sides of the member equally.…”

Section: Materials Properties and Mesh Convergence Studymentioning

confidence: 99%

“…Baczkiewicz et al . (2018) presented the effect of radiation inside hollow sections under moderate non-symmetric fire.…”

Section: Model Validation and Verificationmentioning

confidence: 99%

“…Some essential failure mechanismssuch as the failure of connections and local buckling, etc.are not considered by the codes (Maljaars and Soetens (2010)). Further, there are no unified rules for the design of hollow aluminium sections (Baczkiewicz et al, 2018). The design of structures under fire depends entirely on temperature calculation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of cavity radiation on aluminium hollow tubes and facade system subjected to fire

Yadav,

Ayyagari,

Srivastava

2023

JSFE

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PurposeThis paper numerically investigates the effect of cavity radiation on the thermal response of hollow aluminium tubes and facade systems subjected to fire.Design/methodology/approachFinite element simulations were performed using ABAQUS 6.14. The accuracy of the numerical model was established through experimental and numerical results available in the literature. The proposed numerical model was utilised to study the effect of cavity radiation on the thermal response of aluminium hollow tubes and facade system. Different scenarios were considered to assess the applicability of the commonly used lumped capacitance heat transfer model.FindingsThe effects of cavity radiation were found to be significant for non-uniform fire exposure conditions. The maximum temperature of a hollow aluminium tube with 1-sided fire exposure was found to be 86% greater when cavity radiation was considered. Further, the time to attain critical temperature under non-uniform fire exposure, as calculated from the conventional lumped heat capacity heat transfer model, was non-conservative when compared to that predicted by the proposed simulation approach considering cavity radiation. A metal temperature of 550 °C was attained about 18 min earlier than what was calculated by the lumped heat capacitance model.Research limitations/implicationsThe present study will serve as a basis for the study of the effects of cavity radiation on the thermo-mechanical response of aluminium hollow tubes and facade systems. Such thermo-mechanical analyses will enable the study of the effects of cavity radiation on the failure mechanisms of facade systems.Practical implicationsCavity radiation was found to significantly affect the thermal response of hollow aluminium tubes and façade systems. In design processes, it is essential to consider the potential consequences of non-uniform heating situations, as they can have a significant impact on the temperature of structures. It was also shown that the use of lumped heat capacity heat transfer model in cases of non-uniform fire exposure is unsuitable for the thermal analysis of such systems.Originality/valueThis is the first detailed investigation of the effects of cavity radiation on the thermal response of aluminium tubes and façade systems for different fire exposure conditions.

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“…Durante a ocorrência de um incêndio, os bombeiros são submetidos a níveis variáveis de fluxos de calor. Apesar de se poderem encontrar submetidos a valores de baixa densidade de fluxo de calor (Baczkiewicz et al 2018), a permanência a longos períodos de exposição pode proporcionar um desequilíbrio térmico do corpo humano e queimaduras na pele (Fu et al 2015).…”

Section: Introductionunclassified

Simulação Numérica De Fluxos De Calor Recebidos Em Vestuário De Proteção De Bombeiro

Dahamni¹,

Nechab²,

Benarous³

et al. 2019

FLAMMAE

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Neste estudo é apresentada uma simulação numérica para determinar o fluxo térmico recebido pelo vestuário de proteção individual utilizado pelos bombeiros. O estudo é centrado no impacto das condições de ventilação dos compartimentos nos fluxos incidentes que atingem a superfície exterior do equipamento de proteção individual (EPI). É apresentada uma simulação de transferência de calor por radiação e por convecção para um compartimento com geometria definida a três dimensões, constituído por uma porta, uma janela e sujeito a uma fonte de calor localizada, caracterizado por uma taxa estacionária de liberação de calor (HRR) durante um tempo de exposição prescrito. É considerada uma restrição aditiva no limiar da fração mássica de oxigênio responsável pela extinção da chama. A camada exterior do vestuário de proteção é modelada como um meio sólido, com sensores posicionadas no peito (F -front) e atrás do peito (R-rear). O caso apresentado corresponde a uma situação em que a temperatura exterior do vestuário proteção e a do ar fresco adjacente ao corpo do bombeiro são mantidas a 25 °C. Apesar da importância dos dispositivos de ventilação mecânica para eliminação do fumo e atenuação da temperatura, são determinados valores críticos para os caudais de ventilação que podem levar a enormes fluxos de calor, revelando a aparição de situações de ignição instantânea de combustão incompleta (FOV).

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Effect of radiation inside square hollow section under moderate non-symmetric fire

Cited by 3 publications

References 12 publications

Influence of Internal Pressure on Hollow Section Steel Members in Fire

Influence of Internal Pressure on Hollow Section Steel Members in Fire

Effect of cavity radiation on aluminium hollow tubes and facade system subjected to fire

Simulação Numérica De Fluxos De Calor Recebidos Em Vestuário De Proteção De Bombeiro

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