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  3. a. a symmetrical rectangle box section prestressed

a. A symmetrical rectangle box section prestressed concrete beam of external width of 300 mm and...

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Civil Engineering

a. A symmetrical rectangle box section prestressed concretebeam of external width of 300 mm and external depth of 600 mm witha uniform thickness of 40 mm is prestressed with 7 numbers straightsteel wires of 7 mm diameter located at a distance of 15 mm fromthe bottom of the soffit and 5 number of 5mm diameter of the steelwires located at the 575 mm from the bottom of the beam . The wireswere initially tensioned on the prestressing bed with aninitial
prestress of 1500 N/mm . The beam is subjected to point loadof 48 + 0.2 (35) kN at the center of the beam and a uniformlydistributed load of 20 kN/m entire length
of the beam with a length of 10 m. Calculate the resultantstresses at the end and mid span
section with neat stress distribution diagram. Assume thedensity of the concrete is 24 kN/m^3.

b. In the above problem, how to control the resultant stressessuch that they do not exceed 25 N/mm2 at mid span section.
kN/m .

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