experimental and numerical study of hybrid friction damper

In this study a new hybrid energy dissipation device is developed by combining two friction dampers (auxiliary and main fuse) in series to be used for seismic control of two different earthquake intensities. Compared with the conventional friction dampers, the new hybrid damper has an advantage in that only auxiliary fuse (with low sliding force) is activated for moderate earthquakes and both fuses work simultaneously for strong earthquakes. Cyclic loading tests of the combined hybrid dampers are carried out to evaluate their seismic energy dissipation capability. The obtained experimental force- displacement indicates proper details of the new damper to create two performance level. Finite element analyses of the test specimens are also carried out for comparison, which had good agreement with the test results. Force displacement characteristics, Energy dissipation and equivalent viscous damping are also derived and good agreement has been found with code requirement for displacement dependent dampers. Also, it is demonstrated, engaging the main fuse with non-loaded pretention bolts, strength losses of hybrid damper in subsequent cycles are limited compared to the common friction dampers which can be called “resurrection-type” behavior of the main fuse in the main shocks.