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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. Modern design and construction techniques enable steel construction to satisfy these demands and deliver structures which are competitive in terms of overall cost.
For most multi-storey commercial buildings, straightforward steel construction will meet the required vibration performance criteria without modification. For more vibration-sensitive applications, such as hospital operating theatre floors, steel’s advantages can be utilised, although stiffer solutions may be necessary. Even if a stiffer floor is required, steel remains the most cost-effective and lightweight solution.
Long-span applications, for which steel is the only option, have been found to offer very good vibration damping, despite common preconceptions that damping in composite floors is lower than that of concrete structures. This is because of the large mass of the long-span sections which participate in any motion reduces the magnitude of the vibration response. The steel sector has extensive experience in designing steel structures to ensure compliance with even the strictest vibration performance criteria.
The subject of floor vibrations is complex. This article describes the basic theory of floor vibrations, human perception and acceptability levels and provides practical methods for assessing the likely vibrational behaviour of floors in steel framed buildings.