A cylindrical concrete tank, 40m external diameter is to be prestress – McqOptions

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1.	A cylindrical concrete tank, 40m external diameter is to be prestressed circumferentially by means of a high strength steel wire (Es = 210kn/mm2) jacked at 4 points and 90 degrees apart. Find the expected extension at the jack?
A.	150mm
B.	130mm
C.	144mm
D.	133mm
Answer» D. 133mm

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