A simply-supported post-tensioned pre-stressed concrete beam of span 18 m has the following properties: area of...
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A simply-supported post-tensioned pre-stressed concrete beam of span 18 m has the following properties: area of cross-section, 4 - 2800 x 10² mm²; elastic section modulus, Wa=68800 × 10³ mm³ and self-weight = 6.26 kN/m. The limiting design strengths are: (1) at transfer: 3 N/mm² in tension; 20 N/mm² in compression (ii) in service: zero tension; 18 N/mm² in compression. Determine the initial pre-stressing force (Unit: kN), assuming that this is governed by both of the design strengths at transfer, when the beam carries only its own weight. Calculate also the corresponding eccentricity (Unit: mm) of the tendon profile at mid-span. A simply-supported post-tensioned pre-stressed concrete beam of span 18 m has the following properties: area of cross-section, 4 - 2800 x 10² mm²; elastic section modulus, Wa=68800 × 10³ mm³ and self-weight = 6.26 kN/m. The limiting design strengths are: (1) at transfer: 3 N/mm² in tension; 20 N/mm² in compression (ii) in service: zero tension; 18 N/mm² in compression. Determine the initial pre-stressing force (Unit: kN), assuming that this is governed by both of the design strengths at transfer, when the beam carries only its own weight. Calculate also the corresponding eccentricity (Unit: mm) of the tendon profile at mid-span.
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Answer rating: 100% (QA)
Answer The initial prestressing force P 0 is approximately 840kN The corresponding eccentricity at midspan e is approximately 17439mm Explanation To d... View the full answer
Related Book For
Understanding Business Ethics
ISBN: 9781506303239
3rd Edition
Authors: Peter A. Stanwick, Sarah D. Stanwick
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