Across-wind response characteristics of tall-square towers in urban flow: An experimental study focused on the aeroelastic effects

Author:

Shan Wenshan1ORCID,Yang Qingshan12ORCID,Guo Kunpeng1ORCID,Chen Cong3ORCID,Zhen Wei4,Kim Yong Chul5ORCID

Affiliation:

1. School of Civil Engineering, Chongqing University 1 , Chongqing 400044, China

2. Chongqing Key Laboratory of Wind Engineering and Wind Energy Utilization 2 , Chongqing 400045, China

3. Institute of Steel Structures, Technische Universität Braunschweig 3 , Beethovenstr. 51, Brunswick, Germany

4. Beijing Institute of Architectural Design 4 , Beijing 100045, China

5. Department of Engineering, Tokyo Polytechnic University 5 , Tokyo 243-0297, Japan

Abstract

To fully use the land resource in the urban regions of metropolises, high-rise buildings of large aspect ratio maybe preferred for the new constructions. To systematically investigate the across-wind responses of these quite slender structures, the urban boundary layer flow of high turbulence intensity was simulated in the wind tunnel, and aeroelastic tests realized by the pivot model setup were carried out for the square cross section towers of various heights resulting in large aspect ratios (λ = 12, 16, 20). No appreciable aeroelastic behaviors have been observed for the λ = 12 tower even for a very low damping ratio (0.57%). This is in line with the many previous studies for the tall-square tower with an aspect ratio not higher than 10, likely due to the very high turbulence intensity in the urban terrain, mitigating the occurrence of possible aeroelastic behaviors. In contrast, the λ = 16 and (especially) the λ = 20 towers exhibit strong oscillations known as the across-wind galloping, evidenced by the monotonic increase in the amplitude–velocity curve and the clear characteristics of simple-harmonic oscillations. Moreover, it is observed that for a certain range of low damping ratios, these large oscillations were initiated at the same wind speed very close to the vortex-resonance wind speed. The interaction mechanism between vortex induced vibration and galloping is thus supposed responsible for this observation (even in urban flow). Finally, peak across-wind responses at various damping ratios were provided as well, serving as a useful reference for the future design of similar tall-square towers.

Funder

National Natural Science Foundation of China

Chongqing Science and Technology Foundation

Overseas Expertise Introduction Project for Discipline Innovation

Fundamental Research Funds for the Central Universities

Joint Usage / Research Program of the Wind Engineering Research Center at Tokyo Polytechnic University in Japan

Publisher

AIP Publishing

Reference46 articles.

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