Modern design and construction.
Floor vibration criteria.
Are usually impractical for vibration sensitive uses.
Spans longer than 35 ft.
For slender floor structures as made in steel or composite construction serviceability criteria govern the design.
Guidance is given for.
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.
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.
All floor vibration criteria have two parts.
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.
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.
Vibration criterion vc curves.
A prediction of the floor response and a human tolerance level.
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.
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.
Floor systems so designed is unknown at this time.
Because of the complexities involved in human response to vibration and the different.
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.
Many criteria have been proposed through the years for human comfort related to vibration of floor systems.
Values for dynamic load param.
This data is then compared with the equipment manufacturer s specification for the level of vibration that is allowable for that machine.
The vc vibration criteria curves were developed in the early 1980s by eric ungar and colin gordon.
The principal sources of vibration in buildings are.
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.
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