03: A simply supported prestressed concrete beam has a spun 10.0 m, Fig.3); and carries an imposed lond of (3.0 kNm). Th

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03 A Simply Supported Prestressed Concrete Beam Has A Spun 10 0 M Fig 3 And Carries An Imposed Lond Of 3 0 Knm Th 1 (66.97 KiB) Viewed 55 times

03: A simply supported prestressed concrete beam has a spun 10.0 m, Fig.3); and carries an imposed lond of (3.0 kNm). The initial prestressing forces are (Por-120 kN at 60 mm above bottom face, and (P. 12 - 80 kN at the neutral axis. The losses are 16 % of the initial forces. Por concrete: S'et - 32 MPa (at transfer). I c = 40 MPa (strength after 28 days of casting). Y. 25 kN/m (weight). A 46.6*10mm'. 1-760"10" mm. The section and the forces shown are at the center of the span. Estimate the cracking moment Me only ? (3 marks) Top facea) per - 1-09 C256 mm P₂ 672 573244 mm 60 mm Bottom foce (2)