TMD for Floor Vibration Control — Test Before Construction

Long-span concrete floors can be structurally safe but still feel uncomfortable when subjected to walking, jumping, exercise, dancing, or other rhythmic human activities.

As part of the development of PTFEM+OP, we tested the use of Tuned Mass Dampers (TMDs) on a two-span concrete floor consisting of two continuous 8 m × 8 m panels with a 200 mm slab thickness.

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A TMD is a relatively small mass installed on the floor and connected through a spring and damping mechanism. It is tuned to move in response to troublesome floor vibration and helps reduce the acceleration experienced by occupants.

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The analysis demonstrates an important practical point: TMD performance depends not only on its size, but also on where it is installed and which vibration mode it is intended to control. On a continuous floor, a TMD installed in one location can even significantly reduce vibration in an adjacent span because the entire floor vibrates as a connected structural system.

For floors with several important vibration frequencies, multiple TMDs can be placed at suitable locations and tuned differently to provide broader vibration control.

PTFEM+OP allows engineers to simulate human activity, observe the floor response, add TMDs, and directly compare the predicted acceleration with and without vibration control. With intelligent optimization algorithms, multiple TMDs can work for any type of floor system.

The objective is simple:

Design the floor, test its vibration performance, and investigate mitigation measures before construction—not after occupants complain.