Zhakin I. The carrying capacity of steel-concrete columns under the power and intensive temperature influences

The object-concrete columns with the continuous and circular sections; purpose – development of the technique of the computing of the steel-concrete columns with the continuous and circular sections on the power and the temperature influences with the various conditions of leaning; methods – the method of elastic solutions in the form of the method of changing parameters for the calculating the strained - stress state in the columns section; analytic and numbering integrating of the equations of thermoelasticity solutions; discretization of the domain and the numbering solution of the non-linear problem of thermoexchange with the mobile vaporization boundary; novelty – the technique of the computing of the steel-concrete columns with the continuous and circular sections on the power and temperature influences is developed with the accounting of the three-axes strained state of the concrete; the model of the concrete as the three-phase environment; non-stationary temperature-moisture field with the mobile vaporization boundary; the changing of the physics-mechanics characteristics on the heating; changing of the deformation parameters and ? on the dependence of the level of power and temperature influences; the influence of the various protection materials on the fire-strength of the steel-concrete columns is showed; results – the technique of the computing of the stresses on continuous and circular sections of the steel-concrete columns is developed with the taking into account the three-axes stress state in the concrete; the work of the column in the normal temperature is investigated; influence of the various protection materials on the fire-strength of the steel-concrete columns is showed; the sphere of the use – projecting, reconstruction, strengthening.