In given article the results theoretical and experimental researches bent are submitted and is compressed — bent of steel fiber reinforced concrete elements at static and short-term dynamic loads. The valid nonlinear diagram of deformation of steel fibre reinforced concrete and its analytical description is received at short-term dynamic load. Complex experimental researches of work of steel fibre reinforced concrete designs are lead at static and short-term dynamic loads, the new scientific data are received. Methods of calculation of durability and crack-stability such elements are developed in view of nonlinear work of concrete, armature and steel fiber reinforced concrete. The grant devoted to an estimation of a technical condition, to restoration and amplification of ferro-concrete designs of buildings and constructions with application of steel fiber reinforced concrete is developed.

The article presents the results of research work joints of reinforced concrete columns without increasing or reinforced with metal clips with short-term dynamic loading. For realization of this task has developed a program of experimental and numerical their research. As a result of experimental studies were obtained scheme of strain, crack formation and destruction, as well as the values of failure loads of experimental samples. The obtained results are compared with the data of numerical calculations performed with the help of the calculation of a program based on the finite elements method. The results of experimental and numerical calculations have shown good agreement and reliability upgrades joints columns metal clips.