Effects of corner modifications on wind loads and local pressures on walls of tall buildings
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Effects of corner modifications on wind loads and local pressures on walls of tall buildings
1. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China 2. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China 3. Engineering Research Center of Urban Disasters Prevention and Fire Rescue Technology of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan 430072, China 4. Department of Architectural Engineering, Yonsei University, Seoul 120-749, R.O. Korea 5. Department of Architectural Engineering, Kyungil University, Gyeongbuk, R.O. Korea
Abstract
Keywords
In this study, the aerodynamic characteristics of tall buildings with corner modifications (e.g., local wind force coefficients, mean pressure distributions, normalized power spectrum density, and extreme local pressure) were examined. Wind tunnel experiments were conducted to measure the wind pressures on building models with different heights and recessed corners of different ratios. At a wind direction of α = 0° (i.e., wind blowing on the front of a building), corner modifications effectively reduced wind forces in all cases. Specifically, small corner modification ratios reduced wind forces more effectively than their larger counterparts. However, corner modifications resulted in extreme local pressure on building surfaces. In addition, for small corner modification ratios, the probability of extreme local pressure occurring at α = 0° was high. This probability was also high for large corner modification ratios at α = 15° (i.e., wind blowing slightly obliquely on the front of a building) because wind blowing obliquely creates substantial vortex shedding on one side surface and extreme negative pressure over one building side surface. Results of computational fluid dynamic modeling were adopted to determine details of the aerodynamic characteristics of tall buildings with corner modifications.
tall building,
Introduction
Wind affects various aspects of tall buildings such as safety, the performance of cladding and windows, and habitability by occupants. In general, a tall building is square-shaped or rectangular, and these shapes create relatively strong vortex-induced wind forces owing to wind impinging on the building. To reduce these strong vortex-induced wind forces, the external shape of the building is modified using different types of corner modifications and cross-sectional shapes. These modifications change wind flow patterns around tall buildings and reduce their wind loads. Many researchers have used computational fluid dynamics (CFD) to simulate wind flow patterns. Dagnew and E-mail: [email protected]
aerodynamic modification, local pressure, extreme local wind loads, proper orthogonal decomposition, computational fluid dynamics
Article History Received: 23 January 2020 Revised: 20 July 2020 Accepted: 03 August 2020 © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Natur
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