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A 1200 mm deep by 750 mm wide post-tensioned simply supported beam is shown below. The...

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Civil Engineering

A 1200 mm deep by 750 mm wide post-tensioned simply supportedbeam is shown below. The beam spans 12.0 m and is subject to asuperimposed dead load of 50 kN/m and a live load of 35 kN/m. Boththe superimposed dead load and live load are applied after transfer(after stressing has taken place). The tendon is located at themid-height of the beam at each end, and its centreline sits 50 mmfrom the base at midspan. The concrete strength at transfer is 22MPa, and at maturity is 40 MPa. Assume Ec = 32800 MPa, γc = 24kN/m3 and ignore any prestress losses.

Estimate the approximate total short-term and long-termdeflection under the load combination G + 0.7Q. Assume Pi = 1750 kNand Фcc = 2.8.

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