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  • BSI
    BS 6611:1985 Guide to evaluation of the response of occupants of fixed structures, especially buildings and offshore structures, to low-frequency horizontal motion (0.063 Hz to 1 Hz)
    Edition: 1985
    $281.30
    / user per year

Description of BS 6611:1985 1985

1.1 This British Standard relates to typical responses of people to the horizontal motion of structures in the frequency range 0,063 to 1 Hz. The recommendations are categorized in accordance with the use of the structures and, in the case of off-shore fixed structures, with the nature of work being carried out.

Injury of occupants due to structural vibration is outside the scope of this British Standard.

1.2 Whole-body motion caused by structural vibrations induced by infrequent external environmental forces is considered separately from whole-body motion resulting from structural vibrations caused by frequently occurring force actions. Frequently occurring force actions may arise from external sources, machinery or structure services such as elevators, fans, air conditioners, heating units and plumbing. Both perceptible magnitudes of low-frequency horizontal motion of structures and magnitudes likely to raise minimum adverse comment are included.

NOTE 1 Visual perception of building motion, the influence of torsional oscillations of structures and the effects of noise may influence the subjective response to vibrations of structures but no quantitative assessment is made.

NOTE 2 Blasting, earthquakes and similar events are excluded from the scope of this British Standard.

NOTE 3 An off-shore fixed structure is one founded on the sea bed, such as a gravity platform or a steel jacket with a piled foundation. Floating structures, tension leg and articulated platforms are excluded from the scope of this British Standard.

NOTE 4 In buildings, the response of people is for a normal adult population and, although it is known that levels of vibration considered acceptable vary with age groups and sex, no definite correction factors can be put forward at present to adjust the acceleration magnitudes for these influences. On off-shore fixed structures, the recommendations only apply to trained personnel.

NOTE 5 This British Standard applies to horizontal motion of structures as perceived by human beings in any posture, sitting, standing or reclining.



Relates to typical responses of people to the horizontal motion of structures in frequency range 0.063 Hz to 1 Hz. Whole body motion caused by structural vibrations induced by infrequent external environmental forces is considered separately from vibrations caused by frequently occurring force action.

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.

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