Maurice Tutor

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Category > Management Posted 07 Oct 2017 My Price 7.00

Prestressed concrete

Prestressed concrete beams are sometimes manufactured in the following manner. High-strength steel wires are stretched by a jacking mechanism that applies a force Q, as represented in part (a) of the figure. Concrete is then poured around the wires to form a beam, as shown in part (b). After the concrete sets properly, the jacks are released and the force Q is removed (see last part of figure). Thus, the beam is left in a prestressed condition, with the wires in tension and the concrete in compression. Let us assume that the prestressing force Q produces in the steeI wires an initial stress σo = 760 MPa. If the moduli of elasticity of the steel and concrete are in the ratio 8: 1 and the crosssectional areas are in the ratio 1: 30, what are the final stresses αs and αe in the two materials?

 

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Maurice Tutor
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Status NEW Posted 07 Oct 2017 10:10 PM My Price 7.00

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