Application of Friction Pendulum Bearings …
455
Fig. 1 Friction pendulum system a general idea, b modeling of FP bearing in upward position, and
c downward position [13]
An important element of FB is the lateral restoring parameters, such as force,
which is provided through spherical shape of the system and stiffness. Hysteretic
relationship loop of FP is rigid plastic with post yielding hardening and stick-slip
effect at the breakaway as it shown in Fig. 2, for two covering slider materials:
polyamide (PA) and polyethylene (PE).
Kumar et al. [11] noticed that the sliding velocity, axial pressure and the temperature on the slip surface have the influence on the sliding friction coefficient as shown
in Fig. 3.
In the analysis [11], µ = 0.6 is the coefficient at a bearing pressure p o = 10 MPa
when T o = 20 °C is the temperature at the sliding surface. The authors also marked
that friction coefficient increases considerably at high speeds and decreases with
increase of temperature.
Dynamic excitation is accompanied by the states of predominant periods of ground
motions, dangerous from the point of resonance. Increased search for optimal friction
bearings prompted the search for adaptive solutions. Depending on the displacement
455
Fig. 1 Friction pendulum system a general idea, b modeling of FP bearing in upward position, and
c downward position [13]
An important element of FB is the lateral restoring parameters, such as force,
which is provided through spherical shape of the system and stiffness. Hysteretic
relationship loop of FP is rigid plastic with post yielding hardening and stick-slip
effect at the breakaway as it shown in Fig. 2, for two covering slider materials:
polyamide (PA) and polyethylene (PE).
Kumar et al. [11] noticed that the sliding velocity, axial pressure and the temperature on the slip surface have the influence on the sliding friction coefficient as shown
in Fig. 3.
In the analysis [11], µ = 0.6 is the coefficient at a bearing pressure p o = 10 MPa
when T o = 20 °C is the temperature at the sliding surface. The authors also marked
that friction coefficient increases considerably at high speeds and decreases with
increase of temperature.
Dynamic excitation is accompanied by the states of predominant periods of ground
motions, dangerous from the point of resonance. Increased search for optimal friction
bearings prompted the search for adaptive solutions. Depending on the displacement