Wind-Induced Motion of Tall Buildings

Kwok, Kenny; Burton, Melissa; Abdelrazaq, Ahmad

doi:10.1061/9780784413852

Cited by 25 publications

(19 citation statements)

References 61 publications

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“…As long as the accelerations of the building are controlled, the movements may not be a limiting condition from the point of view of human perception. [72] To increase the equivalent damping, instead of adding mass, a proportion of the own weight of the building is used as the mass of the TMD. This implies that part of the building would be moving differentially from the other.…”

Section: Proposed Arrangementmentioning

confidence: 99%

An integrated damping system for tall buildings

Martinez-Paneda

Elghazouli

2020

Structural Design Tall Build

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Summary This paper proposes an integrated damping system that aims at providing relatively high damping levels through the mobilization of a proportion of the structure's own mass. This offers significantly higher mass levels and, consequently, considerably more damping compared to conventional tuned mass dampers. Fluid viscous dampers are used to control accelerations in parallel with springs to resist the static loads applied to the moving mass. The advantages of employing relatively large mass levels in achieving considerable damping and reducing sensitivity to tuning are first analyzed using an idealized two degree of freedom structural representation. This is then followed by a description of the proposed “integrated damping system,” which is illustrated through a case study of a 250‐m tall building. The benefits of the proposed damping system are demonstrated through several numerical parametric assessments, as well as a selected suite of earthquake records. For the adopted case study, it is shown that, besides reducing the level of perceivable accelerations, the use of the suggested arrangement can offer an equivalent damping exceeding 50% of the critical damping, resulting in more than 40% reduction in the wind loads as well as over 60% reduction in displacement and acceleration response under seismic excitations.

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Section: Proposed Arrangementmentioning

confidence: 99%

An integrated damping system for tall buildings

Martinez-Paneda

Elghazouli

2020

Structural Design Tall Build

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“…The RMS acceleration, which has been used by most guidelines historically (ISO, 1984), is related to the average effect of a number of cycles over the same period of time. In this approach, the degree of occupants' objection to building motion is determined by the number of cycles above a threshold and the intensity of those cycles (Boggs, 1997;Johann et al, 2015;Kwok et al, 2015). (Boggs, 1997) Waveform is commonly defined in terms of peak (crest) factor which is the ratio of peak to…”

Section: Wind-induced Vibration Characteristicsmentioning

confidence: 99%

Moving from Human Perception to Acceptability: A Paradigm Shift in Vibration Serviceability Assessment of Tall Buildings

Heshmati¹,

Shahabpoor²,

Darby

et al. 2020

Structures Congress 2020

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The current vibration serviceability assessment (VSA) criteria for wind-induced vibrations in tall buildings is based largely on human perception threshold which is not necessarily translatable to human 'acceptability' of vibration. Therefore, issues such as the effects of windinduced motions on occupants comfort, work performance, motion sickness, and sopite syndrome are not taken into account in current VSA guidelines. This paper provides an overview of the characteristics of wind-induced vibrations, state-of-the-art VSA guidelines, and the current understanding of occupants' acceptability of wind-induced motion in tall buildings. The VSimulators facility in the Universities of Bath and Exeter to assess the effects of motion and environment on human is introduced. This facility enables in-depth research in this field through controlled simulation of structural motion and the environment and multi-modal measurement of human reactions.

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“…It is acknowledged that the accelerations of the structure due to wind action may nauseate building occupants; major manifestations of disease could vary from concern and anxiety to nausea and fear. [ 8 ] Graybiel and Knepton [ 9 ] noticed that low dose of motion exposure induces, also, lack of motivation on work, daydreaming, and low‐level depression; therefore, the design of the structure should consider carefully also comfort of the occupants. [ 10 ]…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a code‐based approach could be a practical tool only to predict a reasonable response of the building and assess if further analyses are required. [ 8 ] Furthermore, most of the guidelines do not state which measure of peak acceleration should be considered in the verifications. For ultimate limit state (ULS), peak values of acceleration should be considered, whereas for serviceability limit state (SLS), the root mean square (RMS) measurements, as the standard deviation of the set of “random” velocity fluctuations, may be more significant for comfort assessments.…”

Section: Introductionmentioning

confidence: 99%

“…For ultimate limit state (ULS), peak values of acceleration should be considered, whereas for serviceability limit state (SLS), the root mean square (RMS) measurements, as the standard deviation of the set of “random” velocity fluctuations, may be more significant for comfort assessments. As denoted by Kwok et al, [ 8 ] transient effects are less critical than steady‐state effects, considering that a person can tolerate discomfort for a short period of time. Furthermore, the evaluation of acceleration is related to frequency amplification and the relationship between frequency and human threshold, as demonstrated by Irwin [ 11 ] in bidirectional motion simulators.…”

Section: Introductionmentioning

confidence: 99%

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Comfort assessment of high‐rise timber buildings exposed to wind‐induced vibrations

Lazzarini

Frison

Trutalli

et al. 2021

Structural Design Tall Build

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Summary The current trend of increasing the height limits of timber buildings makes wind‐induced vibrations a non‐negligible issue. The dynamics of high‐rise timber structures are discussed, focusing on accelerations and comfort assessment of the currently tallest timber building in the world, namely, the 18‐storey timber building in Norway. Verifications according to available standards were firstly carried out. Then, computational fluid dynamic analyses with Kratos Multiphysics were performed to simulate the wind flow around a rigid body. Afterward, the wind loads were applied to a single‐degree of freedom model and to a reduced finite element model, performing a one‐way coupling between the wind flow and the structure. Wind‐induced vibrations resulted particularly strong in the across‐wind direction, which is the most sensitive to the wind flow and the shape of the building. Provisions in international standards resulted to be not always enough to avoid discomfort in the occupants. Therefore, fluid dynamic analyses are suggested to simulate the actual response and verify the comfort criteria of tall timber buildings susceptible to wind‐induced vibrations.

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Wind-Induced Motion of Tall Buildings

Cited by 25 publications

References 61 publications

An integrated damping system for tall buildings

An integrated damping system for tall buildings

Moving from Human Perception to Acceptability: A Paradigm Shift in Vibration Serviceability Assessment of Tall Buildings

Comfort assessment of high‐rise timber buildings exposed to wind‐induced vibrations

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