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# Floor Vibrations

## Human activities like walking, running and dancing - and operating machines - can introduce floor vibrations due to resonance.

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

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)

## Related Topics

• ### Acoustics

Room acoustics and acoustic properties. decibel A, B and C calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate sound pressure, sound intensity and sound attenuation.
• ### Noise and Attenuation

Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.

## Related Documents

• ### Beams Natural Vibration Frequency

Estimate structures natural vibration frequency.
• ### Floor Joist Capacities

Carrying capacities of domestic timber floor joists - Grade C - metric units.
• ### Human Effects when Exposed to Low-Frequency Noise or Vibration

Physiological effects from low-frequency noise or vibrations.
• ### Low-Frequency Vibrations Effects on Building Constructions

Effects of low-frequency vibrations on building constructions.

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## Citation

• The Engineering ToolBox (2010). Floor Vibrations. [online] Available at: https://www.engineeringtoolbox.com/floor-frequency-vibration-d_1641.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

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