A concrete beam of span 15 m, 150 mm wide and 350 mm deep is prestressed with a parabolic cable as shown in the figure (not drawn to the scale). Coefficient of friction for the cable is 0.35, and coefficient of wave effect is 0.0015 per metre.If the cable is tensioned from one end only, the percentage loss (round off to one decimal place) in the cable force due to friction, is ________.Correct answer is '4.49'. Can you explain this answer?

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If the cable is tensioned from one end only, the percentage loss (round off to one decimal place) in the cable force due to friction, is ________.

Correct answer is '4.49'. Can you explain this answer?

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Practice Test: Gate Civil Engineering(CE) 2020 Paper: (Session II)

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A concrete beam of span 15 m, 150 mm wide and 350 mm deep is prestress...

Jacking from one end
x = L = 15 m
Wobble correction factor, K = 0.0015
Coefficient of friction = 0.35 = μ
P = Not given
p₀ = Unknown
Change of gradient,

% loss of stress in steel due to friction

= (0.0015 × 15 + 0.35 × 0.064) × 100
= 4.49%

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A concrete beam of span 15 m, 150 mm wide and 350 mm deep is prestressed with a parabolic cable as shown in the figure (not drawn to the scale). Coefficient of friction for the cable is 0.35, and coefficient of wave effect is 0.0015 per metre.If the cable is tensioned from one end only, the percentage loss (round off to one decimal place) in the cable force due to friction, is ________.Correct answer is '4.49'. Can you explain this answer?

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