Some people head into work with every intention of having a productive day, only to find themselves sleepy and unable to focus. All that planned productivity grinds to an unavoidable halt. Nor is it just work stress, a spreadsheet migraine, or general frustration with the human condition.
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Excessive levels of vibration in office floors have become a common source of complaint by occupants and building owners in recent years. The need for large open-space working areas, the availability of light and high-strength building materials, the use of computer-aided design and lighter building contents due to paperless offices are the main factors causing the problem. The evaluation and assessment of floor vibrations as related to human perception and comfort are therefore important issues to consider. Several standards and design guides include provisions to address these requirements. The most recent research studies and standards recommend the use of vibration dose value VDV for such evaluation, which is believed to provide a consistent and reliable measure of vibration acceptability to humans. Using the results of tests conducted on four different building floors, this paper studies the provisions of the recent standards for the estimated vibration dose value eVDV and attempts to clarify their applications. This paper also compares the provisions of various standards and design guides in terms of building floor vibration acceptability levels.
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. 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.