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Theory of Structures

Q1: A steel rod 1 metre long having square cross section is pulled under a tensile load of 8 tonnes. The extension in the rod was 1 mm only. If Esteel = 2 x 106 kg/cm2, the side of the rod, is

A 1 cm

B 1.5 cm

C 2 cm

D 2.5 cm

ANS:C - 2 cm

e = PL/AE.
So
0.1= (8000 * 100)/(A * 2000000).
A = (8000 *100) / ( 0.1*2000000).
A = 4 squre cm.
So
Side = √4 = 2 cm. Ans.



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