Review article

Bolted connections are quite often used in steel structures. in most connections with high-strength bolts, the bolts work being in tension. However, the phenomenon of stress concentration (SC) in bolt thread has not been sufficiently studied. Bolt fatigue is a key factor in the fatigue failure of such connection under uniaxial tension. in this study, based on the analysis of a mechanical model of bolt thread, there has been developed a method for calculating the SC in a bolt thread, taking into account the thread lead angle (TLA), as well as in the absence of TLA. Using ANSYS20.2, commonly used high-strength bolts were selected for modeling, which allowed revealing the location of stress concentration in the bolts. At the same time, based on the results of numerical calculations, the proposed calculation methodology was verified. it is concluded that the calculation presented in the paper makes it possible to determine the SC at the root of the thread.