Question

A simply supported prestressed concrete beam of size 500×800mm is loaded with UDL of 20000N/m on a span of 10m obtain thedistribution of stress at mid span qt quarter span and at ends by the stress and strength concept it prestressing force is 1800kN and tendon is concentric
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Answer 1

Answer:A prestressed concrete T-beam is to be designed to support an imposed load of

4.4kN/m over an effective span of 5 m. The T-beam is made up of a flange 400 mm

wide and 40 mm thick. The rib is 100 mm wide and 200 mm deep. The stress in the

concrete must not exceed 15 N/mm2

in compression and zero in tension at any

stage. Check for the adequacy of the section provided, and calculate the minimum

prestressing force necessary and the corresponding eccentricity. Assume 20% loss of

prestress.

[Answer: P= 181 kN: e=78 mm]

Explanation: try out with this same formulae