to recent friction damper manufactured by Fluor Daniel

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to one another to provide desired energy
dissipation.    Plates are clamped together with bolts and
allowed to slip at predetermined load.  The
performance of friction damper is not affected by temperature, and stiffness
degradation against aging. Pall et al (1979) conducted static
and dynamic test on verity of sliding elements with different surface
treatments. During seismic excitations, friction damper slips at predetermined
optimum load and dissipate major portion of seismic energy. In 1987 Filiatrault
and Cherry states some limitation of Palls friction damper that Palls damper
was only valid   if slip during every cycle. They proposed a
detailed macroscopic model using brake lining pads at intersection of cross
braces which improve the physical properties of damper.   Some alternate friction damper designs are
proposed in some resent literature. Roik et al., (1988) investigate the use of
three stage friction grip elements. The recent friction damper manufactured by
Fluor Daniel known1 as EDR i.e. Energy Dissipating restraint. It consists of
steel compression wedges and bronze friction wedges to transform the axial
spring force into normal pressure acting outward on the cylinder wall. In 1992  Suzuki et al., investigated the  performance of friction damper on piping
system. In 2006 bi-directly interaction of friction force was suggested by
Bakre et al.,   has significant effects on response of the
piping on friction support. In 2001 Y. L. Xu,. investigate the use of
semi active friction damper in to control the response of wind exited truss
tower. That was the  first known attempt  compared with passive friction dampers, the
semi-active friction dampers are more robust and versatile for improving both
serviceability and strength performances of wind excited large truss towers. In
2002 Imad H Mualla investigates the performance of steel frames with new
friction damper during seismic event.  The
application of the new FDD presents
a feasible alternative to the conventional ductility-based earthquake-resistant
design both for new construction and for upgrading existing structures. A.V.
Bhaskarao and  R.S. Jangid (2005) did the
seismic analysis of connected structure with friction damper. In 2000 Ceredic
Marsh investigated the application of friction in conjunction
with rigid structural frames, either steel or concrete, it gives the most
economical system to provide a degree of protection against seismic activity
for framed medium-rise buildings. Improvements in the dampers and their
utilization are under continuous study and other friction devices for other
types of building are being developed.



Viscoelastic damper includes viscoelastic
solid damper and viscoelastic fluid damper. In 1969 Mahmoodi presented the
concept of vicoelastic damper.  

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