Unsteady aerodynamic force measurements on a super-tall building with a tapered cross section

Cooper, Kevin R.; Nakayama, Masanao; Sasaki, Yasuhito; Fediw, A.A.; Resende-Ide, S.; Zan, S.J.

doi:10.1016/s0167-6105(97)00258-4

Cited by 67 publications

(30 citation statements)

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“…Vickery and Steckley [49] proposed a negative aerodynamic damping model. Cooper et al [50] attempted to measure wind pressure on a harmonically vibrating building model to obtain total aerodynamic force. Aerodynamic damping was then computed using a method similar to Steckley's.…”

Section: Across-wind Aerodynamic Dampingmentioning

confidence: 99%

Across-wind loads and effects of super-tall buildings and structures

Quan

2011

Sci. China Technol. Sci.

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Across-wind loads and effects have become increasingly important factors in the structural design of super-tall buildings and structures with increasing height. Across-wind loads and effects of tall buildings and structures are believed to be excited by inflow turbulence, wake, and inflow-structure interaction, which are very complicated. Although researchers have been focusing on the problem for over 30 years, the database of across-wind loads and effects and the computation methods of equivalent static wind loads have not yet been developed, most countries having no related rules in the load codes. Research results on the across-wind effects of tall buildings and structures mainly involve the determination of across-wind aerodynamic forces and across-wind aerodynamic damping, development of their databases, theoretical methods of equivalent static wind loads, and so on. In this paper we first review the current research on across-wind loads and effects of super-tall buildings and structures both at home and abroad. Then we present the results of our study. Finally, we illustrate a case study in which our research results are applied to a typical super-tall structure.super-tall building and structure, across-wind aerodynamic force, across-wind aerodynamic damping, across-wind effects, across-wind quivalent static wind loads, case study Citation:Gu M, Quan Y. Across-wind loads and effects of super-tall buildings and structures.

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Section: Across-wind Aerodynamic Dampingmentioning

confidence: 99%

Across-wind loads and effects of super-tall buildings and structures

Quan

2011

Sci. China Technol. Sci.

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“…The fact that rather complicated sectional shapes can reduce wind loads, which are an important issue in tall-building wind-resistant design, has also contributed to the current trend. The effectiveness of aerodynamic modification to reduce wind loads has been widely reported, and aerodynamic modifications thought to be effective include those to sectional shape (horizontally) such as polygon or Y-type (Hayashida and Iwasa, 1990;Hayashida et al, 1992) and corners (Shiraishi et al, 1986;Kwok et al, 1988;Miyashita et al, 1993;Amano, 1995;Kawai, 1998), building shape (vertically) such as taper (Cooper et al, 1997;Kim and You, 2002;Kim et al, 2008;Kim and Kanda, 2010a;2010b) and setback (Kim and Kanda, 2010a,b), as well as introduction of openings (Dutton andIsyumou, 1990, Miyashita et al, 1993). However, most of the above papers have focused on the effect of one aerodynamic modification that changes systematically.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of aerodynamic forces and wind pressures acting on tall buildings with various unconventional configurations

Tanaka

Tamura

Ohtake

et al. 2012

Journal of Wind Engineering and Industrial Aerodynamics

259

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“…Generally, the use of aerodynamically modified cross-sections, such as chamfered, slotted and tapered cross-sections, is an effective means to reduce the wind-induced response of tall buildings (Davenport, 1988;Nakayama et al, 1992;Fediw et al, 1995;Cooper et al, 1997;Tanagi et al, 1999;Kim and You, 2002;Kim et al, 2008). However, modifications of cross-section might not be entirely effective, as adverse effects may also occur (Kareem et al, 1999;Kim and Kawai, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…However, modifications of cross-section might not be entirely effective, as adverse effects may also occur (Kareem et al, 1999;Kim and Kawai, 1999). Cooper et al (1997) derived the aerodynamic damping ratios from the pneumatically averaged pressures measured on a rigid model forced to do a harmonic oscillation. The effects of reduced wind velocity and tip deflection on the along-wind and across-wind aerodynamic damping ratios of a high-rise building with a tapered and chamfered square cross-section were investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of across‐wind aerodynamic damping of super high‐rise buildings with aerodynamically modified square cross‐sections

Cao

Quan

2013

Structural Design Tall Build

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SUMMARYAcross-wind aerodynamic damping ratios are determined from the wind-induced acceleration responses of 10 aeroelastic models of square super high-rise buildings in an urban flow condition (exposure category C in the Chinese code) using the random decrement technique. Moreover, the influences of amplitude-dependent structural damping ratio on the estimation of aerodynamic damping ratio are discussed. The validity of estimated damping is examined through a comparison with previous research achievements. On the basis of the estimated results, the characteristics of the across-wind aerodynamic damping ratios of modified square high-rise buildings are studied. The effects of aerodynamically modified cross-sections, such as chamfered, slotted and tapered cross-section, on the across-wind aerodynamic damping ratio are investigated. The results indicate that modifications of cross-sections are not always effective in suppressing the aeroelastic effects of super high-rise buildings. Low corner-cut ratios (chamfer ratios from 5% to 20% and slot ratios from 5% to 10%) and low taper ratio (1%) significantly decrease the magnitudes of absolute aerodynamic damping ratios. However, large modifications of cross-sections (slot ratio of 20% and taper ratios from 3% to 5%) increase wind-induced responses by changing the aerodynamic damping ratios. According to the database, empirical aerodynamic damping function parameters are fitted for high-rise buildings with aerodynamically modified square cross-sections.

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Unsteady aerodynamic force measurements on a super-tall building with a tapered cross section

Cited by 67 publications

References 1 publication

Across-wind loads and effects of super-tall buildings and structures

Across-wind loads and effects of super-tall buildings and structures

Experimental investigation of aerodynamic forces and wind pressures acting on tall buildings with various unconventional configurations

Experimental study of across‐wind aerodynamic damping of super high‐rise buildings with aerodynamically modified square cross‐sections

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