Answered: Sag rods are places at the center of…

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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An A36 channel section is used as a purlin in a roof system with spacing of trusses at 4.5 m apart. Purlins are to be places at the joints and at the mid points of each top chord member. Sag rods are places at the center of each purlin. The total gravity loads consists of a dead load of 1.2 kpa roof surface (including weight of roofing and purlins) and a live load of 1.4 kPa of the roof surface. Assume the steel section is a compact section and that all loads are applied at the top flange of the purlins. Use LRFD method. (Refer to the figure for the value of equal soacing = S) Properties: Sx = 221.28 x 10^3 mm3 Sy = 19.01 x 10^3 mm3 Zx = 258.82 x 10^3 mm3 Zy = 38.51 x 10^3 mm3 Lp = 0.90 m Lr = 3.34 m Cb = 1.30 m Fy = 248 mPa Use LRFD design method. Determine the flexural strength of the purlins about the x-axis. (kN/m)

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