DEVELOPMENT OF METHODS OF DESIGNING SYSTEMS OF EASY-DROPPED CONSTRUCTION ON THE BASIS OF FLEXIBLE POLYMERIC MATERIALS

Abstract

The article highlights the topic of developing a method for determining the parameters of easy-dropped construction (hereinafter – EDC) on the basis of flexible polymeric materials (hereinafter – FPM) for their guaranteed opening under conditions of achieving a critical value of excess explosion pressure. The analysis of the current normative documents is carried out, as a result of which the requirements to the characteristics of EDC are determined, which are limited to the definition of the list of materials of their production, their area depending on the volume of the room and its category. Attention is drawn to the fact that in Ukraine in the field of fire rationing there are no recommendations for the calculation of EDC parameters, which determines the relevance of the developed methodology for designing and determining EDC parameters based on FPM. During the design of EDC on the basis of FPM the width and height of the openings of the window profile frames were determined as the main design parameters. The equilibrium equation is used for this purpose. The critical deflection is determined by the values of the critical displacements of the edges of the FPM in the mounting nodes. As a result of mathematical transformations, a formula for the critical deflection was obtained, taking into account the smallest slit size of the EDC. To develop a method for determining the size of the openings of EDC on the basis of FPM for their guaranteed opening under the critical value of the excess pressure of the explosion, an equation was proposed in which these dimensions are independent variables, nomograms were constructed to determine the geometric dimensions of EDC. Data on the parameters of the stress-strain state of the FPM and its displacement during the dynamic impact of the explosion were obtained. To verify the results obtained with the help of the developed nomograms, mathematical models of FPM in locks of standard window profile were built and numerical experiments with their use were conducted, which showed that the results obtained by nomograms are adequate, as for all cases EDC on the basis of FPM. The developed technique has a simple implementation and cost-effective calculation algorithms, which allows the design of effective EDC on the basis of FPM.