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RE: Prestressed Concrete Torsion Design (ACI 11.6.3.10)

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Title: RE: Prestressed Concrete Torsion Design (ACI 11.6.3.10)

        Wontae,

                I think most of the prestressed beam analysis programs take this into account. Also, since the prestressing strand is used mostly at the point of maximum moment - usually midspan, since most pretensioned beams are simply spans - but torsion is usually higher towards the ends, this is an effective way of decreasing the mild longitudinal steel required. Be careful about development length and provide hairpins at the ends of strand and mild longitudinal steel to develop the A_sub_l steel at the ends.

                If there is prestressed steel in the beam top to control stresses in the early life of the beam, depending on the analysis, that entire developed area may be used this way.

        Jim Getaz

        Precast Concrete Engineer