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VIBRATION CONTROL

Foreword

Building vibrations is a domain of its own. In this chapter we will limit our interest in such vibrations that can actually radiate audible or perceptible noise.

Sources of Vibrations

Vibrations in a building can be generated by various vibratory sources. Here are a few of them:

  • • Mechanical equipment
  • • Users’ equipment
  • • Rail transportation corridor nearby
  • • People walking or dancing
  • • Wind on the fagade or roof

A Few Standards and Regulations

While standards and regulations pertaining to noise exposure have steadily been developed over the years, texts pertaining to vibration exposure are not as obvious. This is in part due to the lack of data on the subject. While aspects covering excessive vibration levels are usually covered due to the risks to the structure of the building, aspects covering annoyance are not as completely covered. The international standard ISO 2631 [70] considers three vibration spectral limits, for comfort, work efficiency, and danger, respectively, with the highest sensitivity in the 4 to 8 Hz interval.

When it comes to noise generated by vibrations, there are regulations in a few countries [71]. Those typically set a maximum LAeq value over a given time span. For example, a Swiss federal regulation [72] requires the LAeq>1h generated by rail transport not to exceed 30 dB(A) in nighttime.

 
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