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Post Tensioned Beam Construction

SOLVED: EXAMPLE 10.10: The end block of a post-tensioned beam is 80 mm wide and 160 mm deep. A prestressing wire, 7 mm in diameter, stressed to 1200 N/mm² has to be anchored against the end block at the center. The anchorage plate is 50 mm by 50 mm. The wire bears on the plate through a female cone of 20 mm diameter. Given the permissible stress in concrete at transfer, fc, as 20 N/mm² and the permissible shear in steel as 94.5 N/mm², determine the thickness of the anchorage plate.

A post-tensioned prestressed beam of rectangular section 250 mm wide is to be designed for an imposedload of 12 kN/m, uniformly distributed on a span of 12 m. The stress in the concrete must not exceed 17 N/ in compression or 1.4 N/ in tension at any time and the loss of prestress may be assumed to be 15 per cent. Calculate(a) Tthe minimum possible depth of the beam(b) For the section provided, the minimum prestressing force and the corresponding eccentricity(c) Check the results of case (b) by