Calculation evaluation of the effectiveness of technical solutions for natural ventilation of ordinary staircases in case of fire in residential buildings

Introduction. Natural ventilation of ordinary staircases in case of fire is provided for by the provisions of regulatory documents in the field of fire safety and plays an essential role in ensuring the safety of people. This article analyzes the effectiveness of ventilation of staircases through window openings in the outer walls, as well as through the openings of exits to the roof.

The purpose of this article is to develop criteria and mathematical relationships for evaluating the effectiveness of technical solutions for ventilation of staircases, as well as their approbation for residential buildings of various heights.

Methods. Mathematical methods are used to predict the concentration of combustion products on different floors of stairwells, depending on the area of open window openings and the possibility of opening roof access hatches, as well as an analytical method for evaluating the effectiveness of technical solutions for ventilation of stairwells.

Results. Theoretical provisions have been developed to assess the effect of the area of open window openings and roof hatches on the natural ventilation of ordinary staircases in sectional-type residential buildings with exits from apartments to staircases, and calculations have been made to evaluate the effectiveness of these solutions in buildings of various heights.

Conclusions. Based on the research, criteria and mathematical ratios have been developed to evaluate the effectiveness of various technical solutions for the natural ventilation of ordinary staircases. At the same time, the effectiveness of these solutions is determined by the possibility of rescuing people from the apartments of the corresponding floor without the involvement of a significant number of firefighters and without the use
of personal respiratory and eye protection equipment.

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