4. A post-tensioned prestressed beam of span-length of 10 m has a rectangular section 300 mm wide 800 mm deep. The beam is prestressed by a parabolic cable concentric at the supports and with an eccentricity of 250 mm at the centre of span. The cross-sectional area of high-tensile wires in the cable is 500 mm². The wires are stressed by using a jack at the left end so that the initial force in the cable at the right end is 250 kN. Using the following data, calculate (a) the total loss of stress in the wires, (b) The jacking force required at the left end: Coefficient of friction for curvature effect = 0.55 Friction coefficient for wave-effect = 0.003/m Anchorage slip at the jacking
4. A post-tensioned prestressed beam of span-length of 10 m has a rectangular section 300 mm wide 800 mm deep. The beam is prestressed by a parabolic cable concentric at the supports and with an eccentricity of 250 mm at the centre of span. The cross-sectional area of high-tensile wires in the cable is 500 mm². The wires are stressed by using a jack at the left end so that the initial force in the cable at the right end is 250 kN. Using the following data, calculate (a) the total loss of stress in the wires, (b) The jacking force required at the left end: Coefficient of friction for curvature effect = 0.55 Friction coefficient for wave-effect = 0.003/m Anchorage slip at the jacking
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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4. A post-tensioned prestressed beam of span-length of 10 m has a rectangular section 300 mm wide 800 mm deep. The beam is prestressed by a parabolic cable concentric at the supports and with an eccentricity of 250 mm at the centre of span. The cross-sectional area of high-tensile wires in the cable is 500 mm². The wires are stressed by using a jack at the left end so that the initial force in the cable at the right end is 250 kN. Using the following data, calculate (a) the total loss of stress in the wires, (b) The jacking force required at the left end: Coefficient of friction for curvature effect = 0.55 Friction coefficient for wave-effect = 0.003/m Anchorage slip at the jacking
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