應用風洞實驗探討建築物低開孔率多孔性雙層牆之風壓特性

A STUDY ON THE WIND LOADINGS OF LOW POROSITY POROUS WALL OF DOUBLE SKIN FACADE OF BUILDINGS BY WIND TUNNEL TESTS

10.6652/JoCICHE.202309_35(5).0008

陳若華(Jwo-Hua Chen)

多孔性雙層外牆 ； 風洞實驗 ； 風荷載 ； porous wall of double-skin facade ； wind tunnel testm ； wind loadings

中國土木水利工程學刊

35卷5期（2023 / 09 / 01）

511 - 524

繁體中文;英文

本研究以氣動力模型風洞實驗量測，以了解多孔隙外牆風荷載，控制參數包括風攻角、孔隙率、間隙比、側邊開孔等。結果顯示，雙層牆的多孔外牆其外部風壓受開孔條件影響不大，而多孔牆所受淨風壓及夾層內風壓受到實驗控制之各參數均有影響。各不同風攻角作用下，均發現提高間距，有助於降低內牆牆面所受的風壓強度，不論外風壓為正壓或負壓。如將頂部及側邊孔隙加以封閉，對於外牆所受淨風壓的作用將有較明顯的減輕。由實用性考慮，本研究以多孔性外牆夾層頂部封閉、側邊開放案例，建立多孔牆設計風壓係數之轉換因子（u），並利用二次多項式迴歸，成果以表格方式呈現，可供實務上利用外部被覆物設計風壓係數估算多孔牆之風荷載。

A series of aerodynamic experiments in wind tunnel were conducted to explore the wind loadings on porous outside walls of building double skin facade and the wind attack angle, opening ratio, gap spacing and side leaks were token as experiments control parameters. The results shown that the external wind pressures on porous walls seems to be insensitive with these parameters, on the other hand significant changes to the internal wind pressures in addition to the net pressures of porous walls. Basically, increasing the gap spacing would reduce the internal pressures were noticed in all angles of attack of wind. However, there would be minimum loadings on porous wall with full opened side leaks. Consider the needs of practical applications, the data of wind pressures of external wall with side leaks and top closed cases were token to find out the suitable conversion factor (u) by polynomial regression fit processes. This conversion factors which related to the external wind pressures and net pressures were presented in a look-up table. According to these results, the engineers can take this factor and design external wind pressures coefficients got from the design codes or experiments results to estimate the design net pressure coefficients of external porous walls of building double skin facade for their design needs.

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