engleski

Wind loads on tall buildings with porous double-skin façades

Porous double-skin façade (PDSF) systems have become common in high-performance buildings. A PDSF system consists of an inner impermeable façade and an outer permeable façade. A small gap between the two skins enables the wind flow. The aerodynamic characteristics of buildings equipped with PDSF systems of various porosities were studied in an urban environment. Experiments were conducted in a boundary layer wind tunnel (BLWT) at the Inter-University Research Centre on Building Aerodynamics and Wind Engineering (CRIACIV) at the University of Florence, Italy. Flow characteristics were determined using Pitot tubes and hot-wire anemometry system. Aerodynamic loads and surface pressures acting on the building model were measured using a high-frequency force balance (HFFB) and pressure taps on the inner skin of the building model, respectively. The results indicate that the PDSF system on a building in an urban environment does not affect the across-wind and along-wind moment coefficients, while the PDSF system exhibits a slightly negative effect on the power spectral density of the across-wind moment because the peak values are greater. Furthermore, the PDSF system proved to diminish the mean pressure coefficient peak and mean values on all building surfaces as well as the standard deviation of surface pressure fluctuations.

Tall buildings ; porous double-skin façades ; wind loads ; wind-tunnel experiments

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