The article discusses examples of the application of the principle of "characteristic load" (calculations taking into account engineering non-linearity; the designation of subgrade reaction moduli; the designation of the sizes of shelves for beam grillage). The principle of "characteristic load" on the one hand implements the consideration of various factors that are not available when calculating in a linear formulation, on the other hand, it preserves the traditional calculation technology

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The paper deals with numerical research as to how material damping influences the load-bearingstructures in dynamic loads. Certain technique is suggested for modelling behaviour of structure in time historyanalysis with account of material damping. A set of motion equations is solved according to Newmark method asmatrix. Physical meaning of material damping is described. The authors suggest the technique for account ofdifferent materials in parts of structure. The following example is provided: analysis of structure together withsoil and with account of earthquake loads. Analysis results are compared (with and without account of materialdamping). Significant influence of damping on the stress-strain state of the structure is confirmed.

The article discusses a new approach to modeling the behavior of structures under the influence of dynamic loads, including loads from ground and underground transport. The approach is to apply the direct integration method, as well as the SBFEM method to calculate the forces in load-bearing building structures under dynamic influences, taking into account a number of factors - the damping properties of the subgrade, physical nonlinearity of soils and the passage of waves in the soil space. The article presents the main theoretical premises, the results of a numerical experiment of a real monolithic building, built in the zone of influence of the subway.