Question

A 1.2 m concrete column is reinforced by four steel bars, each 20 mm in diameter, as indicated. It is known that for steel E = 200 GPa and α = 11.7 (10-6) / ° C and for concrete E = 25 GPa and α = 9.9 (10-6) / ° C brass tube 300 mm in length, 30 mm outside diameter and 3 mm wall thickness, is fixed in a hand-operated lathe which is adjusted in such a way as to determine the normal stresses induced on steel and concrete due to an increase temperature of 27 ° C. Ans. σ = 7.55 MPa; σconcr = 271.27 kPa.

1,2 m 200 mm 200 mm

Answer 1

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