Structures with Rocking and Energy-Dissipating Fuses


The third set of systems covered in this synopsis is the combination of rocking and energy-dissipating fuses. This includes braced frame fuse systems, core suspended isolation systems, rocking frames with yielding base plates due to uplift, concrete walls with energy-dissipating devices, and supplemental damping systems.

A core suspended isolation system (CSI) was examined by Nakamura et al. (2008). This pendulum isolation system consists of a reinforced concrete core on top of which sits a seismic isolation mechanism composed of a double layer of inclined rubber bearings. The seismic isolation mechanism allows swaying and swinging motion of the hanging structure, as well as rocking motion of the core. Nakamura examined the hysteretic characteristics of full scale rubber bearings under rotational and horizontal displacements.