In a post-tensioned beam of length 12 m, a cable is laid symmetrically, with its central 6 m…
In a post-tensioned beam of length 12 m, a cable is laid symmetrically, with its central 6 m length horizontal and the two straight end-portions sloping up at an angle with the horizontal whose tangent is equal to 0.075. The cable is tensioned by jacking at one end and is anchored at the remote end of the beam. At the jacking end the measured stress is 1040 N/. The ‘wobble’ coefficient K may be assumed as 0.004/m. Calculate the stress in the cable at the remote end and at the two points where the alignment of the cable changes. Assume the coefficient of friction between cable and duct as 0.40. What is the percentage loss of prestress between the jacking end and the anchored end?
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