Vibration criterion vc curves.
Floor vibration criteria.
They were originally developed as a generic vibration criteria for vibration sensitive equipment for use in the semiconductor medical and biopharmaceutical industries but have found application in a wide variety of technological applications.
Guidance is given for.
The vc vibration criteria curves were developed in the early 1980s by eric ungar and colin gordon.
This data is then compared with the equipment manufacturer s specification for the level of vibration that is allowable for that machine.
Acceptance criteria for vibration are specified for human comfort and sensitive equipment.
Allen rainer and pernica 1985 and allen 1990 1990a published criteria for the acceptability of vibration of floor systems that are subjected to rhythmic activities such as danc ing and jumping exercises.
Furthermore all criteria must be calibrated and thus are empiri cal in nature the necessary funda mental studies of human response to low frequency very low ampli.
Values for dynamic load param.
Many criteria have been proposed through the years for human comfort related to vibration of floor systems.
For slender floor structures as made in steel or composite construction serviceability criteria govern the design.
Are usually impractical for vibration sensitive uses.
The principal sources of vibration in buildings are.
Floor systems so designed is unknown at this time.
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 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.
The vibration source plays an important role in the overall vibration analysis.
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.
Because of the complexities involved in human response to vibration and the different.
Preventing or reducing floor vibration problems.
A prediction of the floor response and a human tolerance level.
Spans longer than 35 ft.
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.
Modern design and construction.
To limit induced vibration some facilities use separate.
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