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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.
Calculate the moment of inertia and section modulus (top and bottom of the beam) about the z-axis of the beam cross section of Fig.
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why do we use effective depth ''d'' in calculating the shear capacity of uncracked Concrete beam. If it is uncracked, why cant we use the full depth ''D''.
Q. What is Admixtures? These are the substance which are added to the concrete to improve its qualities either its placing or in its subsequent performance. An admixture may be
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