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Sag rods are provided at

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in Design of Steel Structures by (962k points)
Sag rods are provided at

(a) one-third points between roof trusses

(b) end of span

(c) two-third points between roof trusses

(d) are never provided

This question was addressed to me in an interview.

The query is from Purlins in chapter Design of Beams of Design of Steel Structures

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The correct option is (a) one-third points between roof trusses

Easiest explanation: Purlin sections have tendency to sag in the direction of sloping roof . So, sag rods are provided midway or at one-third points between roof trusses to take up the sag.

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