Question

vw.acparspau rauo depenog upo wC support comniois. EXAMPLE 6.8 A concrete beam with a symmetrical 1-section has flange width and depth of 200 mm and 60 mm, respectively. The thickness of the web is 80 mm and the overall depth is 400 mm. The beam is prestressed by a cable carrying a force of 1000 kN. The span of the beam is 8 m. The centre line of the cable is 150 mm from the soffit of the beam at the centre of span, linearly varying to 250 mm at the supports. Compute the initial deflection at mid-span due to prestress and the self-weight of the beam, assuming E= 38 kN/mm2. Compare the deflection with the limiting deflection permitted in IS: 1343 (D. 24 kN/m) Self-weight of the beam, g 1.12 kN/m 0.00112 kN/mm Prestressing forceP = 1000 kN, I 847 x 10 mm e-50 mm, e2 50 mm, L 8000 mm

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Answer 1

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Deflection 15x0.00/128000 m due to self-weight = 1 I Brux 388 847x10² El.86 mm( downwiel) due to the presmessing force Defletin Tele n - PCG002] 12 EI ( 388847810 Il -4.1 mm Cuponed) : Deflection due to (prestress + Self weight) -6417 886) = –2-24mm (upored). maximunt permissible deflettin according to 351343 a) Quimm (upweed] Hence, the actual deflection is within permissible limits