# Claudiu IAVORNIC

## 22-20 ANALIZA FEM A SISTEMELOR DE IZOLARE SEISMICĂ CU SUPRAFAŢA DE ALUNECARE GENERATĂ DE FUNCŢII POLINOMIALE

Earthquake isolation systems are devices located at the base of
overhead structures (civil works), which have the goal to take off the oscillating
period of this compared with ground, during an earthquake and decrease the
transmitted energy using frictional dissipation. The results of the study
presented of this paper relieve the possibility of using sliding surfaces
generated by polynomial functions by using an intermediate neoprene element
between the sliding surface and the slider.
Cuvinte cheie: izolator seismic, pendul cu fricţiune, neopren, funcție
polinomială, analiză FEM
Keywords: seismic isolation, friction pendulum, neoprene, polynomial
function, FEM analysis

20 ANALIZA FEM A SISTEMELOR DE IZOLARE SEISMICĂ

## 22-19 SISTEME INOVATIVE DE IZOLARE SEISMICĂ BAZATE PE DISIPAREA ENERGIEI PRIN FRECARE. ANALIZA STATICĂ

Friction pendulums are used to reduce forces transmitted from the
ground to buildings, in order to diminish or avoid earthquakes loss, by
permitting relative displacements between the isolated structure and earth
during seismic actions. The result consists in reduced accelerations and
consequently reduced inertia forces. In this paper we present a new approach
regarding implementation of a friction pendulum having the sliding surface
profile based on a polynomial function of superior order. The new device
implies the use of an elastic element between the slider and the sliding surface.
Static and dynamic analyses performed using the finite element method
confirmed that the use of an elastomeric element is suitable for this purpose.
Cuvinte cheie: pendul cu fricţiune, suprafaţa de alunecare, funcţii
polinomiale, element elastomeric
Keywords: friction pendulum, sliding surface, polynomial functions,
elastomeric element

19 SISTEME INOVATIVE DE IZOLARE SEISMICĂ

## 22-17 SISTEME INOVATIVE DE IZOLARE SEISMICĂ BAZATE PE DISIPAREA ENERGIEI PRIN FRECARE. MODEL ANALITIC

In this paper we present an innovative system for seismic isolation
based on frictional energy dissipation. While classical friction pendulum
bearings contain one or more cylindrical or spherical sliding surfaces, they
provide just pairs of two parameters controlling the dynamic behavior of a
structure isolated by this kind of device. In this paper we are implementing
friction pendulums having the sliding surface profile based on a polynomial
function of superior order. This seismic isolation system permit a greater
flexibility in controlling the oscillations of the upper structure, in terms of
displacements or dissipated energy, by using three parameters to control the
force-displacement relation.
Cuvinte cheie: pendul cu fricţiune, suprafaţa de alunecare, funcţii
polinomiale, energia disipată
Keywords: friction pendulum, sliding surface, polynomial functions,
disipated energy

17 SISTEME INOVATIVE DE IZOLARE SEISMICĂ BAZATE