A cross section of a prestressed bonded beam is reinforced by prestressing tendons having a total area of 925 sq.mm. Specified yield strength of prestressing tendon is 1610.75MPa. Specified tensile strength of prestressing tendon is 1895MPa. And specified compressive strength of concrete of 34.6 MPa. The beam has a width of 300mm and a total depth of 600mm. Distance from the extreme compression fiber to the centroid of prestressing tendon is 490 mm, Pi=1387.5 KN
A cross section of a prestressed bonded beam is reinforced by prestressing tendons having a total area of 925 sq.mm. Specified yield strength of prestressing tendon is 1610.75MPa. Specified tensile strength of prestressing tendon is 1895MPa. And specified compressive strength of concrete of 34.6 MPa. The beam has a width of 300mm and a total depth of 600mm. Distance from the extreme compression fiber to the centroid of prestressing tendon is 490 mm, Pi=1387.5 KN , R=0.8 and Eps=196 GPa. If the given section, is provided with additional tension reinforcement, As = 3D25mm with specified yield strength of 415MPa, and with centroid located 75mm above the bottom of the beam,
1. Would the code equation be applicable.
2. What should be the value of Xp in the code equation used to evaluat fps?
3. What is the stress in the prestressed reinforcement at nominal strength, fps, using the code equation.
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