The effect of amplitude-dependent damping on wind-induced vibrations of a super tall building

Li, Qiusheng; Yang, Ke; Wong, C. K.; Jeary, Alan

doi:10.1016/s0167-6105(03)00080-1

Cited by 80 publications

(30 citation statements)

References 17 publications

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“…Beyond 0·2 milli-g, a stabilized damping value of approximately 0·5% is observed, again less than half of the previous PSD result (Table 1). However, the stabilized damping values for this building are consistent with the values noted in RDT analyses conducted on other composite and reinforced concrete tall buildings: Di Wang Building (z ∼ 0·6%) (Li et al, 2005), Central Plaza (z ∼ 0·5%) (Li et al, 2005), Jin Mao (x ∼ 0·55%) (Li et al, 2006), and Bank of China (z ∼ 0·4%) (Li et al, 2003). Still, the discrepancies between the stabilized RDT values and the PSD results are troubling.…”

Section: The Role Of Amplitude Dependencesupporting

confidence: 80%

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

Kijewski-Correa

Pirnia

2007

Structural Design Tall Build

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SUMMARYThe 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 fi nite element predictions. The fi ndings 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.

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Section: The Role Of Amplitude Dependencesupporting

confidence: 80%

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

Kijewski-Correa

Pirnia

2007

Structural Design Tall Build

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“…Such tests have been widely used to extract modal properties from structures (Ceravolo and Abbiati, 2012;Beskhyroun et al, 2013;Farrar and James III, 1997;Magalhães et al, 2010;Snaebjörnsson and Ingolfsson, 2013). Jeary (1992Jeary ( , 1996 showed that outputonly techniques can be used not only to assess the modal properties of such structures, but also how those properties vary with amplitude of vibration, and his work led to studies to quantify that variation for tall buildings as wind speed varies (Li et al, 2002(Li et al, , 2003Tamura and Suganuma, 1996). In this study, the building was tested at two stages during construction, which allowed analysis of the influence of the non-structural elements added between the two tests on the measured modal properties.…”

Section: Introductionmentioning

confidence: 99%

Ambient vibration tests of a cross-laminated timber building

Reynolds

Harris

Chang

et al. 2015

Proceedings of the Institution of Civil Engineers - Constructio

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Cross-laminated timber has, in the last 6 years, been used for the first time to form shear walls and cores in multi-storey buildings of seven storeys or more. Such buildings can have low mass in comparison to conventional structural forms. This low mass means that, as cross-laminated timber is used for taller buildings still, their dynamic movement under wind load is likely to be a key design parameter. An understanding of dynamic lateral stiffness and damping, which has so far been insufficiently researched, will be vital to the effective design for wind-induced vibration. In this study, an ambient vibration method is used to identify the dynamic properties of a seven-storey cross-laminated timber building in situ. The random decrement method is used, along with the Ibrahim time domain method, to extract the modal properties of the structure from the acceleration measured under ambient conditions.The results show that this output-only modal analysis method can be used to extract modal information from such a building, and that information is compared with a simple structural model. Measurements on two occasions during construction show the effect of non-structural elements on the modal properties of the structure.

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“…These losses in stiffness are not permanent and the structure recovers once the excitation subsides. This amplitude dependence has been observed in situ for several tall buildings using stationary approaches such as the random decrement technique with varying trigger conditions Li et al, 2002Li et al, , 2003Li et al, , 2005. However, even with the ability to track mild non-linearities, these approaches still require substantial amounts of weakly stationary data and are ill-suited for short-duration events such as thunderstorms, where averaging is no longer possible owing to the nonstationarity of the event.…”

Section: Introductionmentioning

confidence: 95%

Wind-induced vibrations of buildings: role of transient events

Kijewski-Correa

Bentz

2011

Proceedings of the Institution of Civil Engineers - Structures

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The design of tall buildings, in many cases, is governed by habitability limit states, where accelerations predicted from wind tunnel studies emulating stationary, boundary layer flows associated with synoptic winds are compared to accepted standards for occupant comfort. In both the accelerations predicted for these design limit states and the criteria they are evaluated against, tall building design practice has consciously neglected other types of responses that result from more transient wind events, such as thunderstorms, owing to their short duration. In fact, these types of events and the impulse-like responses they induce in dynamically sensitive structures were not even considered in occupant comfort tests on human subjects until very recently. However, full-scale monitoring programmes on tall buildings, and anecdotal reports from their occupants, have verified that these events do occur regularly and are capable of producing accelerations that exceed those generated by their stationary synoptic counterparts at comparable wind speeds, thus generating perceptible motions on more frequent recurrence intervals. Therefore, it becomes important to investigate the dynamic behaviour of tall buildings under transient wind events and to attempt to gain some understanding of the mechanisms causing these large acceleration responses. The present study attempts to do just that, developing analysis frameworks appropriate for nonstationary records and applying them to full-scale data to enable rare insights into the dynamics of tall buildings under transient wind events, particularly those buildings with marked amplitude dependence and coupling between lateral and torsional modes.

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The effect of amplitude-dependent damping on wind-induced vibrations of a super tall building

Cited by 80 publications

References 17 publications

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

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

Ambient vibration tests of a cross-laminated timber building

Wind-induced vibrations of buildings: role of transient events

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