Situation 8: Light grade steel channels are used as purlins as shown in the figure. The topchords ofthe truss are inclined at 1V:4H. The trusses are spaced at 6m on center. The purlinsare spaced at 6m on center. The purlins are spaced at 1.20m on centers. The roof are asfollows:Dead load including roof materials720MPA1,000MPA1,440MPALive loadWind loadWind pressure coefficientWindwardLeeward0.200.60Channel propertiesSection modulus, SSection modulus, SWeight6.19x10*mm1.38x10*mm%3D79/mThe allowable bending stresses are Ex = 207MPA and E = 207MPA. Assume that allthe loads pass through the centroid of the channels.1.201.20EEÉËÈEESagrod21. Which of the following mostnearly gives the maximum bending stress, fex, for the deadand live load combination (DL+LL)?a. 127.11MPAc. 132.20MP.b. 151.14MPad. 169.48MPA22. Which ofthe following most nearly gives the maximum bending stress, f, for the deadand live load combination (DL+LL)?а. 169.48MPаc. 127.11MPAd. 151.14MPAb. 132.20MPA23. Which of the following most nearly gives the maximum ratio of the actual to theallowable bending stress for the load combination 0.75(DL+LL+WL) at the windwardside?а. 1.25b. 1.55с. 1.09d. 0.91

Loads acting on buildings and other structures are broadly classified as vertical loads, horizontal…

Answered: Situation 8: Light grade steel channels…

Steel Design (Activate Learning with these NEW titles from Engineering!)

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter5: Beams

Section: Chapter Questions

Problem 5.13.2P

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Which of the following best gives the purlin load wuy? See loaded purlin. The figure shown has trusses 6m apart with midpoint sag rods and Purlins C150x12.5 spaced 2.5m on center. The roof truss is inclined 1 vertical to 2 horizontal. The weight of roofing materials is 0.9 kPa (includes self wt.), wind load is 0.8 kPa perpendicular to the roof surface, minimum roof live load is 0.6 kPa. Consider the roofing to provide full lateral support of the purlins. F, = 345 mPa. Use the NSCP 2015 specifications. 2. 5m 2.5m 2. 5m roofing Wuy TRUSS TOP CHORD Truss Spacing = 6m Wux Purlins C150x12.5 Purlin Load Wt A kN/m mm^2 mm C150x12.5 0.12 11400 12.7 152 5.1 SECTION dtw by Ix Sx rx ly mm mm^4 mm^3 mm mm^4 mm^3 mm mm^3 mm^3 48 8.7 143 1100 112 48.4 378 65.2 1230 574 Sy ry Zx| Zy mm mm mm O 4.35 kN/m 5.56 kN/m O 25.02 kN.m
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