DEVELOPMENT OF STRUCTURES OF THE FLEXIBLE CONNECTION ASSEMBLY OF THE STEEL FRAME SUPPORT FOR RELIABILITY BY GAS FACTOR

Purpose. Justification of design requirements and the development of the compliance node of the steel frame support for conditions dangerous for the gas factor.Methodology. It included analysis and generalization of the operation of ductility nodes according to literature data, analysis of bench tests of ductile joints with identification of the mechanism and reasons for the formation of high-temperature heat pulses during dynamic slipping of support elements in typical assemblies, design of ductility duct for hazardous conditions by gas factor.Findings. A historical excursus is given and the technical development of the ductility nodes of the steel frame support is shown, their effectiveness and safety are analyzed, design flaws and improvement directions are identified. The problem of explosive phenomena under dynamic loads on the frame support is considered. The mechanism of the emergence of high-temperature thermal pulses under dynamic loads of the frame, which can lead to the explosion of methane-air mixture in the mine atmosphere. To prevent hazardous events, a design of the compliance unit has been developed, based on the new layout of parts of a typical unit and close to it in cost. The technical effects of new structural elements that exclude explosive phenomena are achieved. For complex mining and geological operating conditions, a reinforced assembly design is proposed, which significantly (1.5-1.7 times) increases the force of sliding of the frame bearing elements in a flexible connection due to the concentration of compression forces of the profiles on their flanges and bottom.Originality. It consists in the development of ideas about the causes of possible explosive phenomena under dynamic loads of the frame support.Practical implications. It consists in the development of a safe, reliable and economical site of compliance of the steel frame support of the mine workings of coal mines hazardous for the gas factor.