FOOTFALL INDUCED VIBRATION IN LONGSPAN COMPOSITE STEEL BEAMS USED IN TWO PROJECTS AT

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FOOTFALL INDUCED VIBRATION IN LONGSPAN COMPOSITE STEEL BEAMS USED IN TWO PROJECTS AT THE UNIVERSITY OF AUCKLAND

Author: V.N.Patel and R.J.Built | Size: 1.3 MB | Format: PDF | Quality: Unspecified | Publisher: Steel Innovations Conference 2013 Christchurch, New Zealand 21-22 February 2013 | Year: 2013 | pages: 13

Floor vibration due to human activity has become increasingly recognised by structural engineers, architects, and building owners as an inherent issue in long-span steel framed floor systems. In the past, attention was primarily focused on strength and deflection serviceability limits. However, as designers seek to push the limits on structural spans, grid spacings and adopt light-weight, low damping structural steelwork floor systems, more detailed consideration is required of the design tools and processes available to analyse and predict the vibration performance of floor systems.
Selection from published criteria of an “acceptable” vibration limit is sometimes possible depending upon the intended use of the space and the availability of manufacturers’ data for any vibration sensitive equipment. Building Owners and User Groups often have little understanding or quantitative “feel” for what performance the proposed “acceptable vibration limit” actually represents.
The theoretical predication of vibration performance against actual measured performance can sometimes vary significantly. This can lead to dispute post-construction as to whether the floor has an “acceptable” level of vibration. Post construction remediation of a space that is deemed to be “too lively” is often difficult, therefore, it is important that the vibration design criteria proposed are discussed and agreed and the limits of theoretical predications of vibration performance are clearly understood by all parties at the outset.
Beca Carter Hollings and Ferner Ltd (Beca) are currently in the process of designing two projects at the University of Auckland, utilising long-span partial-composite cellular steel beams. Both buildings will utilise existing structural frame layouts and foundations. As the new structure is to be built on the existing foundations, there is a necessity to keep it as lightweight as possible. The question of vibration sensitivity has been raised as a potential issue as both buildings contain research laboratories. An in-depth investigation has been conducted into the factors affecting vibration performance in order to give the Client and User Groups confidence that footfall induced vibration will not be an issue with the proposed floor structure.

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[r3be1]

the above link is not working for me; the one down there it does

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