question archive A prestressed concrete beam of rectangular section 300mm wide and 600mm deep has a span of 12m

A prestressed concrete beam of rectangular section 300mm wide and 600mm deep has a span of 12m

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A prestressed concrete beam of rectangular section 300mm wide and 600mm deep has a span of 12m. The effective prestressing force is 980 kN, at an eccentricity of 120mm. The deadload of the beam is 4.5 kN/m and the beam has to carry a L.L. of 7.5 kN/m. Find the Resultant stresses.

_______________a. Find the resultant stress at the top fiber at the end section.

_______________b. Find the resultant stress at the bottom fiber at the end section.

_______________c. Find the resultant stress at the top fiber at midsection.

_______________d. Find the resultant stress at the bottom fiber at midsection.

 

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