# Floor Vibration

## Human activities like walking, running, dancing - and operating machines can induce floor vibrations

Human activities like walking, dancing or running may generate frequency acting forces in a construction.

The frequencies are in general in the range *1.0 to 3.0 Hz (1/s)* - normally below the most common resonance frequencies for floor constructions.

Typical resonate frequencies in wooden beam floors are

- Joist span 3 m :
*12 Hz* - Joist span 6 m :
*9 Hz* - Joist span 9 m :
*7 Hz* - Joist span 12 m :
*6 Hz* - Joist span 18 m :
*5 Hz*

Resonate frequencies in concrete floors on the ground depends on the materials in the ground below. Typical resonate frequencies ranges *10 - 100 Hz*:

- Sand :
*15 - 25 Hz* - Clay, wet :
*15 Hz* - Clay, hard :
*30 Hz* - Gravel :
*20 - 25 Hz* - Limestone :
*35 - 45 Hz* - Solid rock :
*40 - 50 Hz*

### Example - Running Cadence

The force frequency - *f* - for a "everyday" runner with cadence *150 steps pr. minute* can be calculated

* f = (150 1/min) (1 / 60 min/s)*

* = 2.5 (1/s, Hz)*

The force frequency - *f* - for a "elite" runner with cadence *200 steps pr. minute* can be calculated

*f = (200 1/min) (1 / 60 min/s)*

* = 3.3 (1/s, Hz)*

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