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UPSC Civil Service Exam Questions

Q1:

A steel rod of 16 irim diameter has been used as a tie in a bracing system, but may subject to possible reversal of stress due to the wind. What is the maximum permitted length of the member ?

A 1600 mm

B 1400 mm

C 1200 mm

D 1000 mm

ANS:B - 1400 mm

We know,

The radius of gyrations of steel rod.
r = (D/4).
As per IS code 456-2000.

Subject to a possible reversal of stress due to the WIND slenderness ration =350.
(L/r) = 350.
L= 350 * r.
=350 * (D/4).
=350 * (16/4).
=1400 mm.



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