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Amplitude Dependence of Modal Properties in Lateral Vibration of Timber Buildings

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Original languageEnglish
Title of host publication24th International Conference on Sound and Vibration
PublisherThe International Institute of Acoustics and Vibration
Publication statusPublished - 27 Jul 2017

Abstract

In-situ modal analysis of building structures often does not consider amplitude dependence of modal properties. In multi-storey timber buildings, such a consideration may be particularly im- portant. A growing number of mid-rise timber buildings have been built in Europe over the past decade, up to 14 storeys and 45m in height. A design challenge for the engineers of some of these buildings has been the assessment of wind-induced lateral vibration. Prediction of both nat- ural frequency and damping are difficult due to non-linear connection stiffness, and the shortage of precedent buildings for damping measurement. The practical constraints of testing occupied buildings have meant that it has not been possible to excite the buildings artificially, so output-only modal analysis techniques have been applied. The random decrement technique is of particular interest, since it has been used to assess the variation of natural frequency and damping with am- plitude of acceleration, and over recent years, researchers presented a variety of ways to do this. This paper presents a comparison of contemporary methods to assess amplitude dependence of modal properties from output-only data, using synthesised data. Appropriate methods are then applied to data measured from a multi-storey timber building, to comment on the consequences of the variation of modal properties with amplitude for design. It is shown that the damping ratios of these buildings should be expressed as their variation over a range of amplitude, and that long- term monitoring has the potential to bring out a more complete picture of this behaviour.

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