Simultaneous Measurement of Wind Pressures and Flow Patterns for Buildings with Interference Effect

Abstract

This present study investigated interference effects of local peak pressure on a principal building for various locations of an interfering building for various wind directions. To obtain further information and to explain the interference mechanism for enhanced local peak pressure due to the interfering building, simultaneous pressure measurements and flow visualizations using a dynamic particle image velocimetry (DPIV) system were performed in the wind tunnel of the Shimizu Institute of Technology. Experimental results have been examined and presented of effects of an interfering building and wind direction on local peak pressures. DPIV results have shown that, for an oblique configuration, a strong shear layer generated by the interfering building directly hits the principal building, which increases the momentum over its upper surface, resulting in a high pressure coefficient near the leading edge of its upper surface.

Interference effects of an adjacent tall building with various sizes on local wind forces acting on a tall building

“…Particularly, C fDi ′ at z / H = 0.98 of the principal building with an adjacent building of H r = 1.5 is 0.73, which indicates an increase of 73% over the RMS along-wind local force coefficient of 0.42 for an isolated building case. This can be explained by the fact that larger local wind forces near the top of the principal building may be generated not only due to channeling from the narrow gaps between two tall buildings but also due to the form of the approaching flow velocity (Kim et al, 2013). From Figure 9, C fLi ′ along the height levels of the principal building is increased when an adjacent building is located at ( X / B, Y / B ) = (1.5, 0.5, and 1) for H r = 1.5 and (1.5, 1, and 1.5) for B r = 1.5, but others are similar to those along height levels of an isolated building.…”

Shielding Effects of Surrounding Buildings on Wind Loads on Low-Rise Building Roofs

“…Kim et al (2013a) conducted a systematic wind pressure measurement in wind tunnel test to understand the shielding effects on wind force correlations and quasi-static wind load combinations of a target model in a large group of surrounding buildings. To obtain further information and to explain the interference mechanism for enhanced local peak pressure due to the interfering building, simultaneous pressure measurements and flow visualizations using a dynamic particle image velocimetry (DPIV) system were performed in a wind tunnel by Kim et al (2013b). respectively, which are close to the data proposed by the Architectural Institute of Japan (2004).…”

Aerodynamic Characteristics and Lateral Displacements of a Set of Two Buildings in a Linked Tall Building System

“…The wind-induced response and aerodynamics, such as wind velocities and vectors around the buildings, wind pressures on surfaces, and wind loads, vary significantly among tall standalone structures [1][2][3][4][5][6][7]. Therefore, researchers have studied the wind velocities and vectors around numerous buildings using flow visualization or particle image velocimetry (PIV) [8][9][10]. Moreover, several previous studies have examined the characteristics of wind-load components generated in areas with dense concentrations of buildings [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

“…Therefore, researchers have studied the wind velocities and vectors around numerous buildings using flow visualization or particle image velocimetry (PIV) [8][9][10]. Moreover, several previous studies have examined the characteristics of wind-load components generated in areas with dense concentrations of buildings [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, while some have studied the consequences of adjacent tall buildings on the wind-force components of the principal tall building, others have investigated the wind-force components related to the principal tall building and not of the adjacent tall buildings.…”