چكيده لاتين :
Seismic performance of a symmetrical space frame structure resting on sliding bearing with restoring force device is studied considering all the six degrees of freedom. The sliding support is modeled as a fictitious spring with two horizontal degrees of freedom. In non-sliding phase the horizontal stiffness of sliding bearing is considered as very large whereas it is equal to zero during sliding phase.
The El Centro, Turkey and Mexico earthquakes are adopted as the input motion. The response quantities obtainedfrom the analysis
are the acceleration, base shear, bending moment and displacement. In
this study, the response of the isolated structure is compared with the
response of the structure fixed at the base. Response of the isolation
system with restoringforce device is also compared with the response of
the isolation system without restoring .force device. In addition, the
effects of coefficient offriction of sliding material, time period of the
superstructure and the number ofstoreys on response ofstructure are
also investigated. It is concludedfrom the study that the sliding bearing
with restoring force device reduces the earthquake response of the
structure. The restoring force device reduces the sliding and residual
displacements without transmitting additionalforces into the structure.
Response ofthe isolated structure varies with the coefficient offriction
ofsliding material, time period ofsuperstructure and number ofstoreys.
Also, there exists an optimum coefficient offriction ofsliding material
for acceleration, base shear and bending moment at which acceleration,
base shear and bending moment attains a minimum value.
