Economic perspectives of aerodynamic treatments of square tall buildings

Tse, K.T.; Hitchcock, Peter; Kwok, K.C.S.; Thepmongkorn, Sukit; Chan, Chun Man

doi:10.1016/j.jweia.2009.07.005

Cited by 98 publications

(26 citation statements)

References 10 publications

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“…Some of these atypical shapes improve the aerodynamic performances of the buildings themselves and bring economic benefits to the developers. For example, the aerodynamic forces and wind excitations of tall buildings may be effectively minimised by tapered shapes and chamfered corners [11,18,19,21]. In addition, certain building forms have proved useful in achieving acceptable wind conditions at the pedestrian level around buildings [5,10,22].…”

Section: Introductionmentioning

confidence: 99%

Adopting ‘lift-up’ building design to improve the surrounding pedestrian-level wind environment

Tse

Zhang

Weerasuriya

et al. 2017

Building and Environment

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a b s t r a c tModern megacities are teeming with closely-spaced tall buildings, which limit air circulation at the pedestrian level. The resultant lack of air circulation creates poorly ventilated areas with accumulated air pollutants and thermal discomfort in the summer. To improve air circulation at the pedestrian level, buildings may be designed to have a 'lift-up' shape, in which the main structure is supported by a central core, columns or shear walls. However, a lack of knowledge on the influence of the 'lift-up' design on the surrounding wind environment limits the use of 'lift-up' buildings. This study aims to investigate the influence of 'lift-up' buildings and their dimensions on the pedestrian-level wind environments using wind tunnel tests. A parametric study was undertaken by using 9 'lift-up' building models with different core heights and widths. The results were compared with the surrounding wind environment of a control building with similar dimensions. The results reveal that the 'lift-up' core height is the most influential parameter and governs the area and magnitude of high and low wind speed zones around such buildings. Based on wind tunnel test results and a selected comfort criterion, appropriate core dimensions could be selected to have acceptable wind conditions near lift-up buildings.

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Section: Introductionmentioning

confidence: 99%

Adopting ‘lift-up’ building design to improve the surrounding pedestrian-level wind environment

Tse

Zhang

Weerasuriya

et al. 2017

Building and Environment

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“…Fu et al [10] computed field measurements of the characteristics of the boundary layer and storm reaction of two super tall buildings. Tse et al [11] deliberated the general concept to find out the wind loadings and wind-induced responses of square tall buildings with different sizes of chamfered and recessed corners. Irwin [12] focused on the subject of determining and controlling the structural response under wind action for super-tall buildings which require much more pragmatically modelled wind engineering.…”

Section: Introductionmentioning

confidence: 99%

Shape Optimization to Reduce Wind Pressure on the Surfaces of a Rectangular Building with Horizontal Limbs

Paul

Dalui

2020

Period. Polytech. Civil Eng.

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The present study consists of shape optimization of a rectangular plan shaped tall building with horizontal limbs under wind attack, which would minimize the wind pressure on all the faces of the building model simultaneously. For the purpose, the external pressure coefficients on different faces of the building (Cpe) are selected as the objective functions. The position of the limbs and the wind incidence angle are taken as design variables. The design of experiment (DOE) is done using random sampling. The values of the objective functions are obtained by using Computational Fluid Dynamics method of simulated wind flow at each design point. The building model has a constant plan area 22500 mm2. The length and velocity scales are taken as 1:300 and 1:5, respectively. The results are used to construct the surrogate models of the objective functions using Response Surface Approximation method. The optimization study is done using the Multi-Objective Genetic Algorithm. The building shapes corresponding to the Pareto optimal decision variables are shown. The function values corresponding to the decision variables are verified by further introducing a CFD study.

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“…Engineering flows over rough surfaces are commonly used as the analytical platforms to enrich our fundamental understanding of urban atmospheric boundary layer (ABL) problems [5,6]. Typical applications include wind engineering for the built environment [7,8], particulate matter (PM) in street canyons [9], city breathability [10,11], and pedestrian wind comfort/safety [12] as well as guideline formulation [13]. Unlike their smooth-surface counterparts, the aerodynamic resistance induced by rough surfaces on turbulent boundary layers (TBLs) is less sensitive to the Reynolds number Re (= Uh/ν; where U is the characteristic velocity scale of flows, h the characteristic length scale of roughness elements and ν the kinematic viscosity).…”

Section: Introductionmentioning

confidence: 99%

Street-Level Ventilation in Hypothetical Urban Areas

2017

Atmosphere

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Street-level ventilation is often weakened by the surrounding high-rise buildings. A thorough understanding of the flows and turbulence over urban areas assists in improving urban air quality as well as effectuating environmental management. In this paper, reduced-scale physical modeling in a wind tunnel is employed to examine the dynamics in hypothetical urban areas in the form of identical surface-mounted ribs in crossflows (two-dimensional scenarios) to enrich our fundamental understanding of the street-level ventilation mechanism. We critically compare the flow behaviors over rough surfaces with different aerodynamic resistance. It is found that the friction velocity u τ is appropriate for scaling the dynamics in the near-wall region but not the outer layer. The different freestream wind speeds (U ∞ ) over rough surfaces suggest that the drag coefficient C d (= 2u 2 τ /U 2 ∞ ) is able to characterize the turbulent transport processes over hypothetical urban areas. Linear regression shows that street-level ventilation, which is dominated by the turbulent component of the air change rate (ACH), is proportional to the square root of drag coefficient ACH ∝ C 1/2 d . This conceptual framework is then extended to formulate a new indicator, the vertical fluctuating velocity scale in the roughness sublayer (RSL) w RSL , for breathability assessment over urban areas with diversified building height. Quadrant analyses and frequency spectra demonstrate that the turbulence is more inhomogeneous and the scales of vertical turbulence intensity w w 1/2 are larger over rougher surfaces, resulting in more efficient street-level ventilation.

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Economic perspectives of aerodynamic treatments of square tall buildings

Cited by 98 publications

References 10 publications

Adopting ‘lift-up’ building design to improve the surrounding pedestrian-level wind environment

Adopting ‘lift-up’ building design to improve the surrounding pedestrian-level wind environment

Shape Optimization to Reduce Wind Pressure on the Surfaces of a Rectangular Building with Horizontal Limbs

Street-Level Ventilation in Hypothetical Urban Areas

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