1.

When one sag rod is used, the moment about web axis(a) reduces by 50%(b) increasesby 50%(c) increases by 75%(d) reduces by 75%This question was addressed to me in examination.My query is from Purlins in division Design of Beams of Design of Steel Structures

Answer»

Right option is (d) REDUCES by 75%

To elaborate: If sag rods are not used, the maximum MOMENT about web AXIS would be wl2/8. When one sag rod is used, the MOMENTS are reduced by 75% and when TWO sag rods are used at one-third points, the moments are reduced by 91%.



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