Topic outline

  • General


    Semester : 2 2010/2011


    This is an elective subject, which will provide students an understanding and ability to analyse and design prestressed concrete structural elements. Topics discussed include the concept and principles of prestressing, methods of prestressing concrete, stress limits, losses of prestress, selection of sectionand serviceability and strength requirements. Students will also be exposed to the complete analysis and design procedure of simply supported prestressed concrete non-composite and composite beams.

    Creative Commons License This work, SAB4323 PRESTRESSED CONCRETE DESIGN by BADERUL HISHAM BIN AHMAD and ROSLLI BIN NOOR MOHAMED is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at

    • Topic 1


      • Basic concept of prestressing, prestressing methods, materials.
      • Facilities, equipments and hardware, reinforced vs. prestressed concrete
      • BS 8110 design considerations
    • Topic 2

      Elastic analysis of sections for flexure
      • Section properties, sign convention, example.
      • Stresses in concrete due to prestress and external loads, cracking moment, example.
      • Loads and loading stages, critical loadings, stresses at critical loadings, example
    • Topic 3

      Preliminary design for flexure
      • Stress range at a section, permissible stresses and inequality conditions, selection of sections
      • Graphical interpretation of inequality conditions.
      • Determination of prestressing force and eccentricity.
    • Topic 4

      Losses of prestresss

      • Sources of prestress loss, immediate and deferred losses.
      • Estimation of prestress losses: friction, anchorage slip, elastic shortening of concrete.
      • Creep and shrinkage of concrete and relaxation of steel

      • Topic 5


        • Deflection of prestressed concrete beams, short-term deflection
        • Calculation of long-term deflection
      • Topic 6

        Composite beams

        • Composite construction, advantages, design differences.
        • Stages of loading, unshored and shored construction.
        • Stress range and inequality conditions

        • Topic 7

          Design for Ultimate Strength in Flexure
          • Analysis of sections at collapse, use of non-prestressed reinforcement, design considerations
          • Design example

          • Topic 8

            Design for Ultimate Strength in Shear
            • Overload behaviour of beams in combined bending and shear, benefits of prestressing
            • Shear resistance of uncracked & cracked sections
            • Design example
            • Topic 9

              Design of Anchorage Zone

              • Anchorage zone for pre-tensioned and post tensioned members, transmission length
              • End block for post-tensioned members
              • Examples