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Situation 8: Light grade steel channels are used as purlins as shown in the figure. The top chords ofthe truss are inclined at 1V:4H. The trusses are spaced at 6m on center. The purlins are spaced at 6m on center. The purlins are spaced at 1.20m on centers. The roof are as follows: Dead load including roof materials Live load Wind load 720MPA 1,000MPA 1,440MPA Wind pressure coefficient Windward Leeward 0.20 0.60 Channel properties Section modulus, S. Section modulus, S Weight 6.19x10 mm 1.38x10 mm 79/m The allowable bending stresses are E = 207MPA and E = 207MPA. Assume that all %3D the loads pass through the centroid of the channels. 1.20 1.20 EEÉ Ë È EE agrod

Situation 8: Light grade steel channels are used as purlins as shown in the figure. The top chords ofthe truss are inclined at 1V:4H. The trusses are spaced at 6m on center. The purlins are spaced at 6m on center. The purlins are spaced at 1.20m on centers. The roof are as follows: Dead load including roof materials Live load Wind load 720MPA 1,000MPA 1,440MPA Wind pressure coefficient Windward Leeward 0.20 0.60 Channel properties Section modulus, S. Section modulus, S Weight 6.19x10 mm 1.38x10 mm 79/m The allowable bending stresses are E = 207MPA and E = 207MPA. Assume that all %3D the loads pass through the centroid of the channels. 1.20 1.20 EEÉ Ë È EE agrod

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Situation 8: Light grade steel channels are used as purlins as shown in the figure. The top chords ofthe truss are inclined at 1V:4H. The trusses are spaced at 6m on center. The purlins are spaced at 6m on center. The purlins are spaced at 1.20m on centers. The roof are as follows: Dead load including roof materials 720MPA 1,000MPA 1,440MPA Live load Wind load Wind pressure coefficient Windward Leeward 0.20 0.60 Channel properties Section modulus, S Section modulus, S Weight 6.19x10*mm 1.38x10*mm %3D 79/m The allowable bending stresses are Ex = 207MPA and E = 207MPA. Assume that all the loads pass through the centroid of the channels. 1.20 1.20 EEÉËÈEE Sagrod 21. Which of the following mostnearly gives the maximum bending stress, fex, for the dead and live load combination (DL+LL)? a. 127.11MPA c. 132.20MP. b. 151.14MPa d. 169.48MPA 22. Which ofthe following most nearly gives the maximum bending stress, f, for the dead and live load combination (DL+LL)? а. 169.48MPа c. 127.11MPA d. 151.14MPA b. 132.20MPA 23. Which of the following most nearly gives the maximum ratio of the actual to the allowable bending stress for the load combination 0.75(DL+LL+WL) at the windward side? а. 1.25 b. 1.55 с. 1.09 d. 0.91
Transcribed Image Text:Situation 8: Light grade steel channels are used as purlins as shown in the figure. The top chords ofthe truss are inclined at 1V:4H. The trusses are spaced at 6m on center. The purlins are spaced at 6m on center. The purlins are spaced at 1.20m on centers. The roof are as follows: Dead load including roof materials 720MPA 1,000MPA 1,440MPA Live load Wind load Wind pressure coefficient Windward Leeward 0.20 0.60 Channel properties Section modulus, S Section modulus, S Weight 6.19x10*mm 1.38x10*mm %3D 79/m The allowable bending stresses are Ex = 207MPA and E = 207MPA. Assume that all the loads pass through the centroid of the channels. 1.20 1.20 EEÉËÈEE Sagrod 21. Which of the following mostnearly gives the maximum bending stress, fex, for the dead and live load combination (DL+LL)? a. 127.11MPA c. 132.20MP. b. 151.14MPa d. 169.48MPA 22. Which ofthe following most nearly gives the maximum bending stress, f, for the dead and live load combination (DL+LL)? а. 169.48MPа c. 127.11MPA d. 151.14MPA b. 132.20MPA 23. Which of the following most nearly gives the maximum ratio of the actual to the allowable bending stress for the load combination 0.75(DL+LL+WL) at the windward side? а. 1.25 b. 1.55 с. 1.09 d. 0.91
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