Dynamic behavior of tall buildings under wind: insights from full‐scale monitoring: Fid-Bau Portal

Dynamic behavior of tall buildings under wind: insights from full‐scale monitoring

Kijewski‐Correa, Tracy / Pirnia, J. David

10.1002/tal.415.abs

The wind‐induced response of tall buildings is inherently sensitive to structural dynamic properties like frequency and damping ratio. The latter parameter in particular is fraught with uncertainty in the design stage and may result in a built structure whose acceleration levels exceed design predictions. This reality has motivated the need to monitor tall buildings in full‐scale. This paper chronicles the authors' experiences in the analysis of full‐scale dynamic response data from tall buildings around the world, including full‐scale datasets from high rises in Boston, Chicago, and Seoul. In particular, this study focuses on the effects of coupling, beat phenomenon, amplitude dependence, and structural system type on dynamic properties, as well as correlating observed periods of vibration against finite element predictions. The findings suggest the need for time–frequency analyses to identify coalescing modes and the mechanisms spurring them. The study also highlighted the effect of this phenomenon on damping values, the overestimates that can result due to amplitude dependence, as well as the comparatively larger degree of energy dissipation experienced by buildings dominated by frame action. Copyright © 2007 John Wiley & Sons, Ltd.