The alternative method of definition of seismic loadings on the building, based on resistibilityof a construction to vibrationdeformations, without application of response spectrum coefficient is considered. Seismic loads at a foundations level are revealed, that leads to redistribution and decrease of seismic influences on a construction.

The paper considers the alternative method of defining seismic loads on buildings based on the law of conservation of momentum. The expressions for defining seismic loads without any implicit factors (including ?) are obtained. Here appears an opportunity to take into account the soils’ strength characteristics, the foundation configurations and dimensions, the wave ray tilt angle, etc. The design formulas comprise quantitatively determinate and simple parameters of a building and foundation soils. Comparative analysis of the design results according to the proposed procedure and the methods specified in codes and recommendations on earthquake engineering has been carried out.

Is reviewing an alternative method to determine of seismic loads on the building of irregular structures, based on the resistance of structure to deformations of oscillation, without use of the response spectrum.  It is known that the degree of seismic effects on structures depends on the suppleness, and by decreasing their rigidity, the seismic loads are reduced. However, to ensure the strength and performance characteristics the building design is performed with the certain stiffness of structural elements, that determine the character of their oscillatory motion. This factor is used in this method for determining the seismic loads on buildings. The seismic impact is applied at the level of foundation, causing the displacement of foundations and a oscillations of the building. Corresponding external loads that could cause such oscillations, are adopted as seismic loads.