Performance of Viscoelastic Structural Dampers for the Columbia Center Building

by P. Mahmoodi, 3M, St. Paul, MN, USA,
Carla J. Keel, 3M, St. Paul, MN, USA,

Abstract: Vibratory motion of structures such as buildings, bridges, and floors can be reduced by the use of viscoelastic (V. E. ) dampers. Such dampers transfer part of the vibratory energy of the overall system into heat and dissipate this heat into the surroundings. Damper design requires certain pertinent data. These data are generated by calculation and estimation of basic vibrational characteristics of the structure. They include resonance behavior (frequency, amplitude), amplitude-time distribution of motion, mode of vibration and total energy induced by vibration in the structure. It is also pertinent to study the source of vibration (wind, machinery, etc. ), and its nature. This last information is essential in defining the frequency and duration of oscillatory forces responsible for the vibration. This data enables the designer to decide upon the amount of damping required for a predetermined limit of building deflection under selected conditions.

Subject Headings: Vibration | Damping | Viscoelasticity | Heat transfer | Structural behavior | Frequency distribution | Building design

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