Xác định công thức của UBC-97. Xác định diện tích hình chiếu. Xác định Ce, hệ số kết hợp của chiều cao, độ tiếp xúc và độ giật của gió. Xác định hệ số áp lực của vật đang xem xét. Xác định áp lực trì trệ của gió. Xác định hệ số quan trọng. Tính tải trọng gió.

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This formula was developed in 1997 as part of the Uniform Building Code (UBC) for calculation of wind load. The formula is F = A x P, were A is the projected area and P is the wind pressure; however, this formula has an alternate calculation for wind pressure. Wind pressure (PSF) is calculated as P= Ce x Cq x Qs x Iw, where Ce is the combined height, exposure and gust response factor, Cq is a pressure coefficient (it is equivalent to the drag coefficient in the previous two equations), Qs is wind stagnation pressure, and Iw is importance factor. All of these values can be calculated or obtained from the appropriate tables. The projected area of your object is dependent upon its shape and size. If the wind is hitting a flat wall, the projected area is easier to calculate than if the object is rounded. Projected area will be an approximation of the area that the wind comes in contact with. There is no one formula for calculating projected area, but you can estimate it with some basic calculations. Units for area are ft2.  For a flat wall, use the formula Area = length x width, measuring the length and width of the wall where the wind is hitting it. For a tube or column, you can also approximate the area using length and width. In this case, the width will be the diameter of the tube or column. This value is chosen based on table 16-G of UBC and takes into account three terrain exposures with various heights and Ce values for each.  “Exposure B is terrain with buildings, trees or other surface irregularities covering at least 20 percent of the surrounding area and extending 1.6 kilometers or more from the site.” “Exposure C has terrain that is flat and generally open, extending 0.8 km or more from the site.” “Exposure D is the most severe, with basic wind speeds of 129 km/hr or greater and terrain that is flat and unobstructed facing large bodies of water.” The pressure coefficient, Cq, is the same as the drag coefficient (Cd). Drag is the net force in the direction of flow due to pressure on the surface of an...