Using these vibration sensors and our analysis equipment we measure the frequencies and amplitudes of the floor vibrations at the site where the equipment will be installed.
Floor vibration criteria.
The vc vibration criteria curves were developed in the early 1980s by eric ungar and colin gordon.
All floor vibration criteria have two parts.
To limit induced vibration some facilities use separate.
Floor systems are to be avoided especially in lightweight steel concrete composite construction a practical limit being 25 30 ft to avoid excessive footfall vibrations.
Are usually impractical for vibration sensitive uses.
Guidance is given for.
Preventing or reducing floor vibration problems.
Acceptance criteria for vibration are specified for human comfort and sensitive equipment.
Vibration criterion vc curves.
Spans longer than 35 ft.
The principal sources of vibration in buildings are.
Modern design and construction.
Many criteria have been proposed through the years for human comfort related to vibration of floor systems.
Floor vibrations are generally caused by dynamic loads applied either directly to the floor by people or machinery or indirectly by moving floor supports after transmission through the building structure or through the ground.
The vibration source plays an important role in the overall vibration analysis.
The purpose of this publication is to provide design engineers with a practical yet comprehensive review of the criteria and methods available to prevent floor vibration problems.
For slender floor structures as made in steel or composite construction serviceability criteria govern the design.
Floor systems so designed is unknown at this time.
Values for dynamic load param.
A prediction of the floor response and a human tolerance level.
4 floor vibration introduction steel structures can meet even the strictest vibration performance criteria in recent years there has been an increase in demand for buildings that are fast to construct have large uninterrupted floor areas and are flexible in their intended final use.
This data is then compared with the equipment manufacturer s specification for the level of vibration that is allowable for that machine.
Because of the complexities involved in human response to vibration and the different.
L the design guide should not be applied to specification of tolerable vibration by the introduction of acceptance classes chapter 4 and l buildings prediction of floor response due to human.
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