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By Dr. Attaullah Shah Swedish College of Engineering and Technology Wah Cantt.

By Dr. Attaullah Shah Swedish College of Engineering and Technology Wah Cantt. . CE-407 Lec-02 Structural Engineering. The net stress in the prestressed section . The resultant stress due to the combined effect of applied loads and pre-stress force is given as:

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By Dr. Attaullah Shah Swedish College of Engineering and Technology Wah Cantt.

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  1. ByDr. Attaullah ShahSwedish College of Engineering and Technology Wah Cantt. CE-407 Lec-02 Structural Engineering

  2. The net stress in the prestressed section The resultant stress due to the combined effect of applied loads and pre-stress force is given as: At the ends of the beam where there is no moment the MC/I =0 , the stress becomes

  3. Example

  4. Solution

  5. The kern of a section is the region in which a compressive point load may be applied without producing any tensile stress on the cross section.

  6. Shapes of pre-stressed sections: Rectangular shape: Simple and easy to pour I-Section and T-section: Economical Channels and Boxes

  7. Prestress losses The initial prestress becomes smaller with time due to following reasons: A lump sum value has been recommended by ACI Code

  8. Elastic Shortening

  9. Losses due to shrinkage

  10. Relaxation of creep in the tendons

  11. Slippage in post tension and anchorage system

  12. Friction along the duct

  13. Ultimate Stress of pre-stressed section

  14. Assignment No.1

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