An elevated floor slab vibrates substantially from activity as simple as people walking across it. It's a mezzanine in a factory. The floor is 175-ft (7 bays at 25-ft) by 50-ft (2 bays at 25-ft). The slab consists of 2" normal weight concrete over 1-3/8" form deck (non-composite) supported by bar joists 16H6 at 2'-6" on center. There are no partitions or suspended ceiling either above or below the floor, and there are no significant mechanical/electrical items suspended below the floor. The floor is very lightly loaded and used mainly for office functions. The workers sit at desks and computer workstations and are bothered by the excessive vibrations. I'm looking for ways to stiffen the floor to dampen the vibrations. I'm ruling out installing partitions below the floor and thickening the floor slab. Does anyone have a successful way to stiffen the floor joists?
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