Power and energy spectra are considered as additional criteria for the intensity of technogenic, dynamic and seismic impacts. Analyzing the consequences of a number of destructive earthquakes, it was revealed that the intensity of seismic impacts, in addition to ground acceleration, directly depends on the spectral characteristics of the energy and power of external influences. When calculating the design of dynamically tenacious systems, it is necessary to take into account the power and energy spectra in addition to the acceleration spectrum.

The article presents a diagram method of calculation of reinforced concrete slabs. The considered flor slabs were subjected to intensive inflence of climatic conditions of Moscow, as a result of which they received diffrent schemes of damage. The bearing capacity of these plates varied depending on the scheme (section) of the plate damage. At the same time, concrete tests of damaged sections of structures, as well as corrosion-damaged reinforcing bars were performed. The diagrams of concrete deformation of undamaged and damaged areas and the diagrams of stretching of damaged reinforcing bars are obtained. On the basis of experimental diagrams of concrete and rebar deformation, a method of analytical determination of the bearing capacity of the plates was developed.

In the absence of conservation, reinforced concrete slabs are most exposed to atmospheric influences, affecting the strength and deformation characteristics of concrete and bearing capacity of structures. The impact of field conditions on the properties of concrete
depends on many factors that are almost impossible to simulate in accelerated laboratory con-ditions. Therefore, the General approach to the characteristic of the change of the bearing capacity at corrosion damages of reinforced concrete slabs in the conditions of cyclic freezing-thawing, is to assess the main all possible effects of natural conditions on the change of the bearing capacity. This article discusses the numerical calculations to determine the bearing capacity of corrosion-damaged concrete slabs. For an accurate assessment of the residual life of the bearing capacity of the floors in the conditions of long-term cyclic freezing-thawing, were selected typical schemes of damage to the plates and performed a series of tests of corrosion-damaged concrete slabs.
The work of structures in the inelastic stage, as well as the gradual increase in the load, defined deflections, defor-mations and bearing capacity of the plates in the stages of cracking. The comparative analysis of results of numerical calculations and full-scale tests
of plates is given.