Determination of wind loads on porous sunshade roof cover sheets using conversion factor

Từ khóa:

conversion factor
wind loading
porous sunshade roof cover sheet
low-rise building
wind tunnel test 

https://doi.org/10.59382/j-ibst.2023.en.vol1-1

Tóm tắt:

Porous sunshade roof cover sheets installed on building roofs are new structures for mitigating heat absorption. Thus, there have been few studies on wind flow and its effects on wind-permeable structures, and there is no provision for these structures in the major international wind load standards and codes. Unlike wind loading on building roofs, wind loading on porous sunshade roof cover sheets [DD1] is a combination of wind pressures on both the upper and lower surfaces, which complicates the calculation of wind loading. From the viewpoint of structural design, we need a simple method for determining wind loading on these structures. Wind tunnel tests have been carried out for various wind angles, three porosities (ratio between area of orifices and area of sheet), and five gaps between sheet and roof, and results have been analyzed. As a result, the author proposes a simple formula for calculating wind loading on porous sunshade roof cover sheets from wind loadings on normal building roofs available from wind loading codes and standards. The calculated results based on this formula and the Japanese wind loading standard (AIJ-RFLB (2015))[4] are compared with those of wind tunnel tests. There is a good similarity between them.

Nội dung:

Tài liệu tham khảo:

[1]  Bienkiewicz, B. and Sun, Y. (1992). “Wind-tunnel study of wind loading on loose-laid roofing systems”, J. Wind Eng. Ind. Aerodyn, 41-44, 1817-1828.

[2]   Cheung, J.C.K., and Melbourne, W.H. (1988), “Wind loading on a porous roof”, Journal of Wind Engineering and Industrial Aerodynamics, 29, 19-28.

[3]   Gerhardt, H.J., and Kramer, C. (1983), “Wind loads on wind-permeable building facades”, Journal of Wind Engineering and Industrial Aerodynamics, 11, 1-20.

[4]   AIJ-RFLB (2015), “AIJ Recommendations for Loads on Buildings”, Architectural Institute of Japan.

[5]  Vu Thanh Trung (2010), “Wind loading on porous sunshade roof cover sheets”, Phd Dissertation, Tokyo Polytechnic University, Japan.