In this post, I will show you about the Calculation of Elongation & Modified Elongation in Prestressing
Elongation & Modified Elongation in Prestressing
The Stresses in a Pre-stressing strand normally vary along its length and decrease with time. The Principal factors affecting the distribution of stress along a strand are :
- Friction looses during stressing
- Shrinkage of concrete
- Creep of concrete
- Due to seating loss
- Elastic shortening of concrete
- STACKING AND STORAGE OF MATERIALS
- Design and Construction Of Pile Foundations
- Evolution of Retaining Structures
- Glossary Relating To Bitumen And Tar
- Aluminium Formwork Refurbishment
- Safety For Hydraulic Tensioning Jacks
- Methodology of Post Tensioning Work
- Properties of Prestressing HT Strand
- Losses in Pre Stress due to Elastic Shortening
- Jack Pressure for Single and Multi Pull Stressing
- Elongation & Modified Elongation in Prestressing
- Prestressing Materials Management at Site
- Prestressing : Definitions | Advantage | Application
- Slipform – Slipform Planning at Site
- Labour Productivity Norms in Slipform
- Dismantling Procedure of Slipform
- Slipform Reinforcement Schedule Planning
- Assembly of Stair Tower for Slipform
- Assembling Procedure of Tapering Slipform
- Assembling Procedure of Straight Slipform
- Classification Of Slip Form Work
- Design Considerations of SlipForm
- Evolution of Slip Form Now a Days
- Measure Horizontal Distance Using AutoLevel
- Bulking OF Fine Aggregates
- Concrete Cube Samples Taken for Different Volume
- Grades of Concrete as per IS 456 : 2000
- Flowchart For Aluform Work At Site
- Dismantling Process of Aluminium Formwork
- Assembling Process of Aluminium Formwork
- Dismantling Of Slab Aluminium Formwork
- Dismantling Of Wall Column & Beam Formwork
- Aluminium Formwork Concreting Process
- Assembling of Wall Aluminium Formworks
- Assembly Process of Aluminium Formwork
- Aluminium Formwork Worksite Management
- What is 1.54 in Concrete
- De Shuttering Period as per IS 456
- Grade Of Concrete And Its Cement, Sand And Aggregate Ratio
- Derivation Of (d²/162) – Unit Weight Of Bar
- Volume Of Different Shapes
Other factors such as changes in temperature in the flexing of the structure under loading also affect the stresses in a strand, but these do not necessarily result in a permanent lowering of stress level and are not typically considered as stress loses.
a) Elongation Calculation :
1. Design load in N — P
2. Length of Tendon in mm — L
3. Area of Strand in mm2— A
4. Young’s Modulus in N/ mm2— E
Elongation (e) = P x L / A x E in “mm”
b) Modified Elongation Calculation :
1. Area of Strand in mm2— A
2. Young’s Modulus in N/mm2— E
3. Elongation in mm — e
4. Modified Area of Strand (as per TC) in mm2 — MA
5. Modified Young’s Modulus in (as per TC) N/ mm2 — ME
Modified Elongation (Me) = e x A x E / MA x ME in “mm”
I hope you find this information useful. If there is something that I have missed or I do not know, you can comment and tell me which I will try to rectify as soon as possible.
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