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Studies on the impact of external fire on the lye of the shelter housing

Baryłka A.

Journal of Achievements in Materials and Manufacturing Engineering

2021

Vol. 109, nr 1

11--16

Purpose: The presented article presents a numerical analysis carried out to determine the impact of an external fire taking place on the surface of the ground on the level of stress of the trench shelter casing protected by a layer of soil. Design/methodology/approach: Numerical analysis was carried out in two stages. In the first stage, a quasi-stationary distribution of the initial temperature in the centre of the ground and the shelter casing was sought. In the second stage of the analysis, the effect of the fire was considered according to the profile of time changes in the temperature of the shelter object. Findings: We assume that the trench shelter is in an oblong shape, and the fire extends over a vast area. The area surrounding the shelter casing was treated as a material with average constant thermodynamic values. Research limitations/implications: The process related to heating and cooling the enclosure was described on the basis of the Fourier equation on heat conduction in terms of the heterogeneous nature of the material, primer and concrete. Practical implications: The use of the trench shelter model as a research element in the design of special objects. Originality/value: The methods of non-stationary temperature flow through the ground and the shelter casing used, allows for a very realistic indication of how the housing will behave under the influence of high temperature caused by an external fire. The article can be useful for designers who design underground shelters.

Effort of the protective structure of the shelter under the influence of an external fire

Baryłka Adam

Archive of Mechanical Engineering

2021

LXVIII, nr 2

183--193

The paper presents a numerical analysis carried out to determine the influence of the ground surface fire on the strain level of shelter housing with the ground cover. It is assumed that the underground shelter is longitudinal and the fire spans on an extensive area. The area surrounding the housing was treated as a material with average constant thermodynamic values. The heating and cooling processes were described on the basis of the Fourier’s equation concerning heat conduction in consideration on material, ground and concrete heterogeneous nature. The numeric analysis was carried out in two stages. In the first stage, a quasi-stationary initial temperature distribution was sought in the ground centre and shelter shield. In the second stage of analysis, the fire effect was considered according to the time profile of temperature variation in object.