presentation on Prestressing and post tensioning

Presentation on Prestressing and Post-tensioning

Prestressing & Post Tensioning

As explained by wikipedia, Prestressed Concrete is a method for overcoming concrete’s natural weakness in tension. It can be used to produce beams, floors or bridges with a longer span than is practical with ordinary reinforced concrete. Prestressing tendons (generally of high tensile steel cable or rods) are used to provide a clamping load which produces a compressive stress that balances the tensile stress that the concrete compression member would otherwise experience due to a bending load. Traditional reinforced concrete is based on the use of steel reinforcement bars, rebars, inside poured concrete. The technique functions on the principle of using high tensile strength steel alloys producing permanent pre-compression in areas subjected to Tension.

A  portion of tensile stress is counteracted thereby reducing the cross-sectional area of the steel reinforcement. Prestressing can be accomplished in two ways –

  1. Pre Tensioning Concrete
  2. Post Tensioning Concrete

PRETENSIONING :- Placing of concrete around reinforcing tendons that have been stressed to the desired degree.

POST-TENSIONING :- Reinforcing tendons are stretched by jacks whilst keeping them inserted in voids left pre-hand during curing of concrete. These spaces are then pumped full of grout to bond steel tightly to the concrete.

Here is a presentation on the methods of pre-stressing in concrete and details about post-tensioning and pre-stressing by Rajesh Burde (Source : Slideshare)

Guneet Singh Khurana
Ar. Guneet Singh Khurana is a visionary architect, author and currently working in Design Arch as Principal Architect. He holds B.Arch degree from Department of Architecture, Guru Nanak Dev University, Amritsar. His creative approach and interest in designing inspired him to pursue future in architecture. He has an extensive experience in the field of architecture and urban design. He is the founder of Archistudent.net (a resource portal dedicated to providing information and knowledge to the growing community of architecture, interior design, landscape and planning). He is recipient of the PAFE Award for excellence in the field of Environment friendly architecture and University Scholarship for excellence in academics.

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