G SITUATION.Light gage cold- formed steel channels used as purlins are simply supported on roof trusses 6mapart. Sagrods are provided at midspan.Given: Roof Slope = 1V: 4HDead Load (purlin weight included), D = 720 PaLive Load, L= 1000 PaWind Pressure, W = 1440 PaWind Pressure CoefficientsAt Windward Side, Pressure = 0.18At Leeward Side, Suction = 0.60Properties of C Purlins: C200X76Sx = 6.19 x 10^4 mm^3Sy = 1.38 x 10^4 mm^3Fbx = Fby = 207 MPaAssume that all loads pass through the centroid of the C section.For D+L+W.a one third increase in allowable stresses is allowed.Assume that all loads pass through the centroid of the C section.For D + L +W, a one third increase in allowable stresses is allowed.What is the safe purlin spacing (m) due to D + L?O 0.8O 1.5O 1.01.3 (continuation)What is the maximum spacing of purlins (m) due to loads, D, L and W at the leeward side?O 1.4О 301.8O 2.0(continuation)How much is the safe spacing of purlins (m) due to loads D+L+ W at the windward side?1.31.0O 07O 1.6

Given, Roof slope=1V:4H DL=720 Pa LL=1000 Pa Wind pressure W=1440 Pa Windward pressure=0.18 Leeward…

SITUATION. Light gage cold- formed steel channels used as purlins are simply supported on roof trusses 6 mapart. Sagrods are provided at midspan. Given: Roof Slope = 1V: 4H %3D Dead Load (purlin weight included), D = 720 Pa Live Load, L = 1000 Pa Wind Pressure, W = 1440 Pa

SITUATION. Light gage cold- formed steel channels used as purlins are simply supported on roof trusses 6 mapart. Sagrods are provided at midspan. Given: Roof Slope = 1V: 4H %3D Dead Load (purlin weight included), D = 720 Pa Live Load, L = 1000 Pa Wind Pressure, W = 1440 Pa

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

6th Edition

ISBN:9781337094740

Author:Segui, William T.

Publisher:Segui, William T.

Chapter9: Composite Construction

Section: Chapter Questions

Problem 9.2.1P: A W1422 acts compositely with a 4-inch-thick floor slab whose effective width b is 90 inches. The...

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Question

SITUATION.
Light gage cold- formed steel channels used as purlins are simply supported on roof trusses 6
mapart. Sagrods are provided at midspan.
Given: Roof Slope = 1V: 4H
Dead Load (purlin weight included), D = 720 Pa
Live Load, L= 1000 Pa
Wind Pressure, W = 1440 Pa
Wind Pressure Coefficients
At Windward Side, Pressure = 0.18
At Leeward Side, Suction = 0.60
Properties of C Purlins: C200X76
Sx = 6.19 x 10^4 mm^3
Sy = 1.38 x 10^4 mm^3
Fbx = Fby = 207 MPa
Assume that all loads pass through the centroid of the C section.
For D+L+W.a one third increase in allowable stresses is allowed.
Assume that all loads pass through the centroid of the C section.
For D + L +W, a one third increase in allowable stresses is allowed.
What is the safe purlin spacing (m) due to D + L?
O 0.8
O 1.5
O 1.0
1.3

(continuation)
What is the maximum spacing of purlins (m) due to loads, D, L and W at the leeward side?
O 1.4
О 30
1.8
O 2.0
(continuation)
How much is the safe spacing of purlins (m) due to loads D+L+ W at the windward side?
1.3
1.0
O 07
O 1.6

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