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A high quality multi-storey office building built in the '70's with long, 16metre span composite steel beam and concrete floors. When occupied by a new tenant with open-plan space and a minimum of partitions there were problems with vibration in these floors caused by normal foot traffic. This is a well-known problem in floor structures of this kind which are far more flexible than the more common forms of concrete floor construction in Australia. The problem manifested itself mainly in the vibration of computer screens. MEC were engaged to rectify this problem. We investigated methods of damping these vibrations by introducing tuned mass dampers in the ceiling, installing damping posts between floors and adding weight to the floors. All were either very expensive or too intrusive. Ultimately the simple solution that was tested and adopted was to install calibrated rubber pads at the feet of the tables and in the chairs.