Floor systems with low inherited damping can suffer from excessive floor vibration due to human activities. This problem is exacerbated in office buildings associated with modern fit outs. Excessive floor vibrations arise due to inadequate knowledge of the damping values in the design process. Thus rectification measures are normally required to reduce floor accelerations. There are few options available to correct a floor with excessive levels of vibration but the installation of mechanical dampers can be more cheaply than structural stiffening and are often the only practical mean of vibration control in existing structures. This paper proposes multi passive viscoelastic dampers to reduce floor vibrations. The multi damper can be installed in lieu of a large size single damper. The light weight multi damper can be distributed on the floor and easily tuned to the fundamental frequency of the floor. Multi dampers can be designed to achieve various damping values depending on the mass ratio of the damper to the floor. This paper discusses the analytical development of the damper with experimental results presented to demonstrate the effectiveness of the developed multi viscoelastic dampers compared with equivalent single damper.

Keywords: Floor vibrations, viscoelastic materials, multi viscoelastic damper.