Mozzhukhin A.S.
category 3 design engineer, JSC “Atomenergoproekt”. Saint Petersburg, Russian Federation
Publications
Some questions of nonlinear seismic isolation behavior
Issue: #3-2022
read more
An analytical solution of the motion equation of
nonlinear seismically isolated systems on the phase plane is obtained. The
cases of systems with increasing and decreasing stiffness are considered. A
typical example of a system with increasing rigidity is a system with
restrictors. Systems with decreasing stiffness include well-known types of
seismic isolation with kinematic supports of A.V. Kurzanov and Yu.D.
Cherepinsky. For systems of the first type, the motion trajectories on the
phase plane are always limited, but with strong displacement restrictions, an
increase in accelerations takes place. The proposed solution makes it possible
to analyze the dependence of the acceleration growth on the displacement
limitation. Solutions of the second type can be unstable, which is clearly seen
on the phase trajectories. This requires an analysis of their stability when
designing seismic isolation.