Seismic Isolation Systems Based on Friction-Fractional Viscoelastic Dampers

Abstract eng:
This work presents a study of some friction-viscoelastic damping systems for base isolation of structures. The systems are based on a friction-viscoelastic damping device made of a rotational friction damping device extended with a rotational fractional viscoelastic unit. The device is designed to dissipate seismic input energy and wind load and protect buildings from structural and non-structural damage during moderate and severe earthquakes as well as dynamic effects from wind. The damper device has been tested at DTU in Denmark, while intensive experimental tests have been carried out with the friction version of the damper at Takenaka research center in Japan. The comparison of results obtained from the experimental and numerical models show good agreement. Studying the response for static and dynamic loading has identified parameters influencing the response of a structure improved with a given damping system. The quality of the damping system is related to the structural response and an evaluation of the investigated damping systems is made. The damper device is easy to implement in structures. It is an economic device due to material availability. It can easily be replaced if damaged, which is unlikely to happen and it is easily readjusted in site. The frictional damper device has been installed in several buildings in Japan, Greece, India and Denmark.

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