STRESS-STRAIN STATE OF SLIP-CRITICAL CONNECTIONS IN METAL STRUCTURES, WITH REGARD TO THE SPECIFICS OF BOLT TENSION CONTROL
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Abstract
The load-bearing capacity of a slip-critical connection depends on two factors: the bolt tension force and the friction coefficient between the coupled surfaces. Reliably achieving the specified tension force is necessary to guarantee the design performance of the connection. A number of methods for accomplishing this task are known, but only one of them is sufficiently well regulated and used in practice – the torque method.
This article analyzes the requirements and guidelines of foreign and domestic regulatory documents, research conducted in this area in the construction industry and adjacent fields, and identifies the most reasonable methods for further study of bolt tension control.
An analytical model of the stress-strain state of a slip-critical connection is proposed, and the relationship between the bolt tension force and the nut rotation angle is determined. The results obtained are compared with the recommendations of foreign regulations.
An experimental study of the tensioning process for high-strength bolt sets of various diameters – M16, M20, and M24 – has been carried out. The relationships between the nut rotation angle, torque, and tension in the bolt body were described and analyzed. The obtained data were compared with the proposed calculation model. The nut rotation angles that allow the design bolt tension force to be achieved were established.
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