Damping in tall buildings—a mechanism and a predictor

Jeary, Alan

doi:10.1002/eqe.4290140505

Cited by 204 publications

(77 citation statements)

References 13 publications

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“…Another contributing factor may be that the in situ compressive strengths are higher than those assumed in design, resulting again in a stiffer structure. Meanwhile, despite the signifi cant uncertainty surrounding damping prediction, the observed damping values from the PSD, essentially under ambient vibrations, are quite consistent with the 1·5% value assumed in the design, especially considering that damping levels are generally hypothesized to increase with amplitude (Jeary, 1986). These analyses were twice repeated on different cross-sections of the dataset and showed remarkable consistency with the values reported in Table 1 (Abdelrazaq et al, 2005;Pirnia et al, 2007).…”

Section: The Role Of Amplitude Dependencesupporting

confidence: 74%

“…This situation is unfortunate since, of all the dynamic properties that can be modifi ed, increases in damping are the only ones that have consistently proven to reduce accelerations. Although there have been some efforts to develop empirical predictive tools for damping estimation based on full-scale observations (Jeary, 1986;Satake et al, 2003), there is still signifi cant scatter in the data, as well as limited information for high-rise buildings, which tend to be the most sensitive to acceleration-based perception criteria. This scatter is in part due to the relatively minor participation of damping in overall structural response.…”

Section: Introductionmentioning

confidence: 99%

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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: 74%

Section: Introductionmentioning

confidence: 99%

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

Kijewski-Correa

Pirnia

2007

Structural Design Tall Build

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“…Moreover, from field measurements made over the last three decades, it has been recognized that natural frequencies and damping ratios are nonlinear parameters and may increase with vibration amplitude [13][14][15]. However, in structural design, natural frequencies and damping ratios are usually assumed to be constant and independent of structural response magnitudes, and the limited number of studies of dynamic response analysis of buildings considering amplitude-dependent dynamic characteristics has shown that the current design assumption does not appear to be conservative [16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Precast Cladding Systems on Dynamic Characteristics of Steel Frame Buildings by Ambient and Free Vibration Tests

Nakata

Yoshida

et al. 2017

Shock and Vibration

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Full-scale tests on a one-story steel frame structure with a typical precast cladding system using ambient and free vibration methods are described in detail. The cladding system is primarily composed of ALC (Autoclaved Lightweight Concrete) external wall cladding panels, gypsum plasterboard interior linings, and window glazing systems. Ten test cases including the bare steel frame and the steel frame with addition of different parts of the precast cladding system are prepared for detailed investigations. The amplitude-dependent dynamic characteristics of the test cases including natural frequencies and damping ratios determined from the tests are presented. The effects of the ALC external wall cladding panels, the gypsum plasterboard interior linings, and the window glazing systems on the stiffness and structural damping of the steel frame are discussed in detail. The effect of the precast cladding systems on the amplitude dependency of the dynamic characteristics and the tendencies of the dynamic parameters with respect to the structural response amplitude are investigated over a wide range. Furthermore, results estimated from the ambient vibration method are compared with those from the free vibration tests to evaluate the feasibility of the ambient vibration method.

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“…In particular, since there is no means to estimate damping effectively in the design stage, the earliest full-scale efforts were directed towards short-term monitoring of suites of buildings to develop damping databases (Davenport and Hill-Carroll, 1986;Jeary, 1986;Lagomarsino, 1993). Since then, monitoring efforts have grown increasingly long-term (Brownjohn et al, 1998;Li et al, 1998;Kijewski-Correa et al, 2006) with the objective of observing the structure under a range of wind events to validate the design process more systematically, especially in extreme events such as typhoons (Li et al, 2005;Xu and Zhan, 2001).…”

Section: Introductionmentioning

confidence: 99%

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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Damping in tall buildings—a mechanism and a predictor

Cited by 204 publications

References 13 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

Effects of Precast Cladding Systems on Dynamic Characteristics of Steel Frame Buildings by Ambient and Free Vibration Tests

Wind-induced vibrations of buildings: role of transient events

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