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Unformatted text preview: Chapter 15: Homework Problems 1543 9.1 The first three problems of this section consider three different types of roof truss with the same loads. Below is a Fink Roof Truss. The applied forces are P 1 = 1000 lbs. (1 kip), and P 2 = 1200 lbs. (1.2 kip). The important lengths are L 1 = 6 ft. , L 2 = 12 ft. , and L 3 = 19 . 5 ft. . The segment eb attaches at the midpoint of segment af and segment cg attaches at the midpoint of segment fd . Use the method of joints to find the forces in segments ab , ef , and fc . g a b d c e f 1 P 1 L 1 L 2 L 3 L 2 P 1544 Chapter 15: Homework Problems 9.2 This is a Howe Roof Truss. The applied forces are P 1 = 1000 lbs. (1 kip), and P 2 = 1200 lbs. (1.2 kip). The important lengths are L 1 = 6 ft. and L 3 = 19 . 5 ft. . Use the method of joints to find the forces in segments ab , fc , fh and hg . a b d c e f h g 1 P 1 L 3 L 2 P 1 L 1 L 1 L Chapter 15: Homework Problems 1545 9.3 This is a Pratt Roof Truss. The applied forces are P 1 = 1000 lbs. (1 kip), and P 2 = 1200 lbs. (1.2 kip). The important lengths are L 1 = 6 ft. and L 3 = 19 . 5 ft. . Use the method of joints to find the forces in segments ab , fb , fh and hg . g a b d c e f h 1 L 1 L 1 L 1 L 1 P 3 L 2 P 1546 Chapter 15: Homework Problems 9.4 The Warren Bridge Truss spans a distance of 18 m in three equal segments across the bottom. And its height is 4.5 m. If P 1 = 2500 N , P 2 = 1100 N , and P 3 = 1500 N , use the method of joints to find the forces in segments ef , bf , and bc . g a b d c e f 1 P 2 P 3 P Chapter 15: Homework Problems 1547 9.5 The Pratt Bridge Truss in this problem and the KBridge Truss in the next problem both experience the same loading ( P 1 = 1200 N , P 2 = 2200 N , P 3 = 5400 N , and P 4 = 2800 N ) and both span an 18 m distance with six panels of equal width. The entire structure isand both span an 18 m distance with six panels of equal width....
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This note was uploaded on 12/21/2011 for the course ME 270 taught by Professor Murphy during the Fall '08 term at Purdue UniversityWest Lafayette.
 Fall '08
 MURPHY

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