In the article there is presented analysis of the state of stress and deformation of the arch frictional joint, which was carried out on the model of these joints using finite element method. Joints were loaded dynamically with the impact of freely falling mass. Arch joints with and without passive pressure were submitted to an axial compression. Physical model of the frictional joint was developed on the basis of system applied during the stand tests. To solve mathematical model an explicit integration method was used. In result of analyses carried out, temporal courses of force transmitted through the frictional joint, and displacements of section sliding down were determined. Distributions of reduced stresses in elements of frictional joint were also determined and the state of deformation was described.

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