Vibration produced by human footfall on a long span open floor of a new museum building called into question the acceptability of the floor system. Comparison between vibration measurements performed on the slab, and a proposed criterion suggested that the most direct method to improve subjective response was to increase the damping of the floor system. A tuned mass damper (TMD) was attached to the steel framing below the slab and increased the damping by 580%. This resulted in a significant improvement in the perceived acceptability of floor system vibration. This paper discusses the measurements involved, and the theoretical factors used to design the TMD.
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