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ARC322 Quiz 7 2008

# ARC322 Quiz 7 2008 - F = P/A = 130,000 lb(3.14 x(4 in 2...

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ARC322 Quiz 7 Name ____________ KEY _________________ 1 A round extra strong steel column has a tributary area of 1000 ft 2 and carries a DL of 85 lb/ft 2 and a LL of 45 lb/ft 2 . The column has an unsupported length of 15 ft. What is the most economical column diameter that can support the load? TL = 85 lb/ft 2 + 45 lb/ft 2 = 130 lb/ft 2 Column Load = 130 lb/ft 2 x 1000 ft 2 =130,000 lb Column Diameter = 8 in … 130,000 lb < 219,000 lb … OK 2 What is the compressive stress in the column?
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Unformatted text preview: F = P/A = 130,000 lb/ ((3.14 x (4 in) 2 – (3.14 x (3.5 in) 2 ) F = 11,036 lb/in 2 (rounded) 3 Has the actual stress exceeded the allowable stress? 11,036 lb/in 2 < 24,000 lb/in 2 … OK 4 What would the maximum unsupported length of the column need to be in order to use the next smaller diameter pipe? 14 ft 5 What is the total weight of the column in question 1? 15 ft x 43.39 lb/ft = 650.85 lb … say 651 lb...
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