Abstract.Results of the study on the operation of the reinforced concrete columns joints without reinforcement and reinforced by metal casing under short-term dynamic loading are presented in the paper. Program of experimental and numerical studies was developed. As a result of experimental studies schemes of deformation, cracking and fracture, as well as values of fracture loads of experimental samples were obtained. Present results are compared with data of the numerical calculations performed using the computational program based on finite elements method. Results of experimental and numerical calculations showed good convergence and reliability of columns joints strengthening by metal casing.

this paper present results of experimental and numerical research of reinforced concrete columns and joints at short-term vertical dynamic loading, which have yielded new results of the stressedly-deformed condition and schemes of fracture.