SAB4323-01 PRESTRESSED CONCRETE DESIGN

Topic outline

• General
  

  General

  Lecturer : BADERUL HISHAM BIN AHMAD ROSLLI BIN NOOR MOHAMED Semester : 2 2010/2011

  
  

  ---

  Synopsis
  
  

  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.

  
  

  ---

  
  

  
  

  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 ocw.utm.my.

  
  
• Topic 1
  

  Topic 1

  Introduction
  

  • Basic concept of prestressing, prestressing methods, materials.

  • Facilities, equipments and hardware, reinforced vs. prestressed concrete

  • BS 8110 design considerations

  • Introduction File
• Topic 2
  

  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

  • Elastic Analysis of Section File
• Topic 3
  

  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.

  • Priliminary Design File
• Topic 4
  

  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

  • Prestress Loss File
• Topic 5
  

  Topic 5

  Deflection 
  

  • Deflection of prestressed concrete beams, short-term deflection

  • Calculation of long-term deflection

  • Deflection File
• Topic 6
  

  Topic 6

  Composite beams

  • Composite construction, advantages, design differences.

  • Stages of loading, unshored and shored construction.

  • Stress range and inequality conditions

  • Composite Beams File
• Topic 7
  

  Topic 7

  Design for Ultimate Strength in Flexure

  • Analysis of sections at collapse, use of non-prestressed reinforcement, design considerations

  • Design example

  • Ultimate Flexure File
• Topic 8
  

  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

  • Ultimate Shear File
• Topic 9
  

  Topic 9

  Design of Anchorage Zone

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

  • End block for post-tensioned members

  • Examples

  
  

  • End Block Design File