Characteristics of unsteady pressures on slender tall building

Kim, Y.C.; Lo, Yuan-Lung; Chang, Cheng‐Hsin

doi:10.1016/j.jweia.2018.01.027

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…Thus, in flows with lower turbulence intensity, 𝐶 ̃𝐺𝐿 reaches its positive peak at a lower reduced wind speed and undergoes more dramatic changes in its trend. The wind-induced responses of super high-rise buildings are generally dominated by the acrosswind vibration, and previous studies have also indicated that the aeroelastic effects in the along-wind direction are insignificant (Chen et al, 2021b(Chen et al, , 2020aKim et al, 2018). Due to space limitations, evident in all PSDs.…”

Section: Validation Of Identified Aeroelastic Parametersmentioning

confidence: 88%

“…The pressures from the tube were processed based on transfer functions (Holmes and Lewis, 1987;Irwin et al, 1979) to eliminate the distortion attributed to the tube length (1 m). Furthermore, the pressure tubes were fixed to the inner surface of the model to prevent any inertial forces (Kim et al, 2018). The reference point was set at a location upstream of the model with a height of 0.85 m. It should be noted that the unsteady wind pressures and displacement responses were synchronized using a synchronizer trigger device.…”

Section: Pressure Measurementsmentioning

confidence: 99%

“…Only the prototypical aerodynamic shape needs to be simulated accordingly in the two approaches, and the wind loads can be obtained through direct measurement or integration. However, it is essential to note that these wind loads are essentially quasi-static wind loads, which totally neglect the aeroelastic effects arising from the interaction between structural vibration and the incoming flow, known as unsteady aerodynamics (Chen et al, 2021b(Chen et al, , 2021c(Chen et al, , 2018(Chen et al, , 2017Kim et al, 2018). Particularly for highly flexible high-rise buildings and structures, ignoring aeroelastic effects can significantly underestimate wind-induced responses, posing a serious threat to structural safety and serviceability (Chen et al, 2021c(Chen et al, , 2020aFu et al, 2023Fu et al, , 2022.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Fu,

Quan,

Feng

et al. 2024

Preprint

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Unsteady aerodynamic forces play a crucial role in phenomena such as vortex-induced vibration and galloping. However, the influence of turbulence on unsteady aerodynamics remains far from been fully understood. In this study, a series of forced vibration model and rigid model wind tunnel tests were conducted in both a uniform flow and three different turbulent boundary layer flows with varying turbulence conditions to investigate the unsteady aerodynamic forces of a slender three-dimensional prism. Turbulence effects on the along-wind and across-wind unsteady wind pressure, local and generalized aerodynamic force coefficients, Strouhal number, correlations and coherence functions of unsteady aerodynamic forces, and aeroelastic parameters were comparatively investigated, and the underlying mechanisms were further discussed. The results show remarkable differences in unsteady aerodynamics between the uniform and turbulent flows due to the complex coupling effects among the turbulence, vibration amplitude, and reduced wind speed. The vibration has a significant impact on the unsteady aerodynamics in the same direction. Additionally, along-wind vibration could influence across-wind unsteady aerodynamic forces, while across-wind vibration has minimal effects on along-wind aerodynamic forces. Increasing the amplitude of across-wind vibration significantly increases vertical correlation coefficients within the lock-in region but notably reduces the separation length, weakening horizontal correlation coefficients on the sideward face. Nonetheless, the unsteady aerodynamics are mainly determined by the quasi-steady states beyond the lock-in region, and the influence of vibration is generally negligible. As turbulence intensity increases, the power spectra densities of across-wind aerodynamic forces become wider, and the across-wind aerodynamic force coefficients and aeroelastic parameters exhibit more moderate variations with reduced wind speeds. Both the vertical and horizontal correlation coefficients decrease noticeably at a high level of turbulence intensity, and the end effect and the formation of nonlinear aerodynamics are also suppressed. The Strouhal number of the three-dimensional oscillating prism is little affected by turbulence. However, the lock-in region is extended in turbulent flows compared to uniform flow.

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Section: Validation Of Identified Aeroelastic Parametersmentioning

confidence: 88%

Section: Pressure Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Fu,

Quan,

Feng

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Two types of super-slim towers were identified: Manhattan's ultra-luxury towers and all other tall slender residential buildings. Kim et al (2018) studied aerodynamic forces on a tall building with an aspect ratio of 9. The results showed major differences in across-wind direction, but only minor differences in along-wind direction.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Two types of super-slim towers were identified: Manhattan's ultra-luxury towers and all other tall slender residential buildings. Kim et al. (2018) studied aerodynamic forces on a tall building with an aspect ratio of 9.…”

Section: Literature Reviewmentioning

confidence: 99%

Interrelations of slenderness ratio and main design criteria in supertall buildings

Ilgın

2022

IJBPA

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PurposeTo date, there are no studies in the literature that provide a comprehensive understanding of the interrelationships between the slenderness ratio and the main design criteria in supertall towers (=300 m). In this paper, this important issue was explored using detailed data collected from 75 cases.Design/methodology/approachThis paper was carried out with a comprehensive literature review including the database of the Council on Tall Buildings and Urban Habitat(CTBUH) (CTBUH, 2022), peer-reviewed journals, MSc theses and PhD dissertations, conference proceedings, fact sheets, architectural and structural magazines and other Internet sources. In this study, the case study method was also used to gather and consolidate information about supertall towers to analyze the interrelationships. Cases were 75 supertall buildings in various countries [44 from Asia (37 from China), 16 from the Middle East (6 from Dubai, the United Arab Emirates), 11 from the United States of America and 3 from Russia, 1 from the UK].FindingsThe paper's findings highlighted as follows: (1) for buildings in the height range of 300–399 m, the slenderness ratio was usually between 7 and 7.9 and megatall towers were frequently built at a slenderness ratio of 10–15; (2) the median slenderness ratio of buildings in the 400–599 m height ranges was around 8.6; (3) a trend towards supertall slender buildings (=8) was observed in Asia, the Middle East and North America; (4) residential, office and mixed-use towers had a median slenderness ratio of over 7.5; (5) all building forms were utilized in the construction of slender towers (>8); (6) the medium slenderness ratio was around 8 for supertall buildings constructed with outriggered frame and tube systems; (7) especially concrete towers reached values pushing the limits of slenderness (>10) and (8) since the number of some supertall building groups (e.g. steel towers) was not sufficient, establishing a scientific relationship between aspect ratio and related design criteria was not possible.Originality/valueTo date, there are no studies in the literature that provide a comprehensive understanding of the interrelationships between the slenderness ratio and the main design criteria in supertall towers (=300 m). This important issue was explored using detailed data collected from 75 cases.

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Experimental investigation of wind effects on a 282-meter-high tower with complex aerodynamic shapes based on a rigid model and multi-degree-of-freedom aeroelastic model

Quan

et al. 2023

Structures

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Characteristics of unsteady pressures on slender tall building

Cited by 11 publications

References 12 publications

Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Experimental study on unsteady aerodynamics of an oscillating three-dimensional prism in uniform and turbulent boundary layer flows using forced vibration technique

Interrelations of slenderness ratio and main design criteria in supertall buildings

Experimental investigation of wind effects on a 282-meter-high tower with complex aerodynamic shapes based on a rigid model and multi-degree-of-freedom aeroelastic model

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