Mechanics of Materials, 7th Edition
7th Edition
ISBN: 9780073398235
Author: Ferdinand P. Beer, E. Russell Johnston Jr., John T. DeWolf, David F. Mazurek
Publisher: McGraw-Hill Education
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Chapter 1.5, Problem 58P
The Load and Resistance Factor Design method is to be used to select the two cables that will raise and lower a platform supporting two window washers. The platform weighs 160 lb and each of the window washers is assumed to weigh 195 lb with equipment. Since these workers are free to move on the platform, 75% of their total weight and the weight of their equipment will be used as the design live load of each cable. (a) Assuming a resistance factor ϕ = 0.85 and load factors γD = 1.2 and γL = 1.5, determine the required minimum ultimate load of one cable. (b) What is the corresponding conventional factor of safety for the selected cables?
Fig. P1.58
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THIS DIAGRAM IS NOT SHOWN TO SCALE
i.
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F
Ꮎ : Ꮎ
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Chapter 1 Solutions
Mechanics of Materials, 7th Edition
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