With the kinematic excitation of a cantilever rod, it has been shown that flexural-shear oscillations begin at the free end of the rod. In this case, internal bulk forces arise in the rod, which oppose 1/2 f (x, t) to external force, and at the free end of the rod, an associated pair F (l, t) and M (l, t) arise. This coupled pair is the true cause of flexural-shear vibrations. The second part of the force f (x,t) goes to create purely shear vibrations.
From the developed new gravitational-vortex theory of seismic stability, it follows that in the design schemes for one-dimensional models there is a fourfold reserve (reserve) for the assessment of forces and moments in the sections of a homogeneous rod. These capabilities make it possible to increase the acceleration on the seismic zoning maps at least twice and to bring the accelerations observed during strong and destructive earthquakes into line with the accelerations used in BRandR.