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HW_33_Soln

HW_33_Soln - ME 309 Fall 2008 Section 2 Homework 33 Due...

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ME 309 Fall 2008 Section 2 Homework # 33 Due Friday 21 November 2008 Problem 33-1 A fifty-story office building in Chicago is 170- m tall and is square with 30- m -long sides. Ignoring end effects, estimate the drag force exerted on the building for wind velocities of 5, 15, and 45 m/s at the following two directions: a) The wind is aligned with the face of the building and strikes the left side of the building head on. b) The wind is aligned at 45° to the building. The local temperature in Chicago is 250 K , and the pressure is 1 atm . The viscosity may be found from Sutherland’s law: S T S T T T + + = 0 2 / 3 0 0 μ μ For air at normal temperatures, the coefficients in Sutherland’s law are given by: s m kg × = - / 10 716 . 1 5 0 μ , K T 273 0 = , K S 111 = c) The same building is transported to Miami where the temperature is 305 K but the wind is still the same. What effect does the increased temperature have on the loading by the 45 m/s wind? Consider only the strongest wind aligned with the building.

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HW_33_Soln - ME 309 Fall 2008 Section 2 Homework 33 Due...

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