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A cylindrical concrete tank, 30 m external diameter, is to be prestressed circumferentially by means of high-strength steel wire (E, = 2 x 105 N/mm2) jacked at 4 points, 900 apart. If the minimum stress in the wire immediately after tensioning is to be 450 N/mm2 and coefficient of friction is 0.5, calculate :
(a) The maximum stress to be applied to the wires at the jack, and
(b) The expected extension at the jack.
Determine the dimension of the vertical side walls for a rectangular open channel designed to convey 150 cfs of storm water runoff. The runoff is collected in the parking lots and
Determine about the long-term deflections For long-term deflections, the total long-term deflection due to the prestressing force, dead load and any sustained imposed load may
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