The initial phase of a gas deflagration explosion is considered, taking into account the action of blast relief panel structures in the roof of the building, which provide overpressure relief to protect the building structures from the explosion and maintain their integrity. This, in turn, ensures the protection of people in the building from the collapse of the building itself. The structure is a lightweight panel. It closes the opening in the roof and is buried in it to its thickness. The panel comes into motion under pressure. The movement begins after the pressure force overcomes the resistance, which is composed of the weight of the structure and the bond force of the structure with the roof frame. After the blast relief structure is shifted to the depth of sealing, the space for depressurizing is opened. The dynamics of the panel movement and pressure change are studied before the start of pressure relief through the opening space along the perimeter of the opening.
By the time the panel exits the opening, the explosion pressure may reach values incompatible with the stability of the bearing structures. The paper presents dimensionless complexes that determine the explosion process at this stage. The maximum pressure at this stage of the explosion is determined by the mass per unit area of the blast relief panel, the bursting pressure of the connections of the blast relief panel with the frame, and the ratio of the opening time of the opening to the time of the start of movement of the blast relief panel. The relation of these times depends on the dimensionless complexes defined in the work. An unacceptable increase in pressure at the considered stage of the explosion can occur at any opening area. In general, the process is determined by the properties of the panel, the volume of the room, the speed of combustion and the nature of the panel attachment.
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