Main use cases
01. Increased loads
- Increased service, wind or snow loads
02. Ageing of prestressed structures
- Stress relaxation of prestressing steels
03. Connecting structures
- Connect adjacent buildings for higher seismic resilience
Additional prestressing reinforcements
Due to the ever increasing traffic loads on bridges, and the inevitable ageing of prestressed structures of all kinds, it is often necessary to use additional prestressing to recover or increase their initial load-bearing capacity.
This technique consists of adding external forces to modify the stress condition of an existing structure (reinforced or prestressed concrete, masonry or timber structures), so as to bring it back to its initial working condition, or even to increase its load-bearing capacity.
The active reinforcements are loaded at the time of application, which has the advantage of strengthening the structure independently of its subsequent loading, while precisely controlling the level of forces introduced.
Additional prestressing is used to relieve bent elements of insufficient strength or stiffness by compensating for the effects of part of their permanent loads.
The additional prestressing reinforcement is essential to the operation of the reinforced structure and as such its durability is critical. Freyssinet advises you on the choice of corrosion protection for prestressing steel.
From structural analysis to execution
Structural analysis:
We help solve your problems
Freyssinet helps you to choose the most appropriate prestressing system, according to your criteria of mechanical performance, space requirements, durability and intervention schedule.
Copyright: Lisa Ricciotti
Engineering solution:
The right solution at the right place
Freyssinet assists you in developing your project by ensuring that the connection of additional prestressing anchorages and diviators to the existing structure is achieved by proven, often structure-specific arrangements.
Guaranteed results at execution:
A complete control of the implementation
Additional prestressing tendons are installed by certified personnel, taking care not to weaken the existing structure when coring the anchor bars and ensuring a solid connection at the anchor and deflection points to safely transfer the prestressing forces.
Copyright: Jonathan Alexandre
A wide range of applications
Strengthening of building frames
- Low service disruption
- Fast installation process
- Low aesthetic impact
Strengthening of bridges
- Very high reinforcement capacity
- Compact solution
- High durability
Strengthening of storage units
(i) Anchoring 1X15 for radii from 6m to 27.5m (ii) Anchoring 2X15 for radii from 3.7m to 5.5m
- Low service disruption
- High durability
- Hoops spacing adjusted
to the need
Strengthening of building frames
- Low service disruption
- Fast installation process
- Low aesthetic impact
Strengthening of bridges
- Very high reinforcement capacity
- Compact solution
- High durability
Strengthening of storage units
(i) Anchoring 1X15 for radii from 6m to 27.5m (ii) Anchoring 2X15 for radii from 3.7m to 5.5m
- Low service disruption
- High durability
- Hoops spacing adjusted
to the need
Discover related case studies
Preheater tower structural strengthening for the Bulacan cement plant
Y Bridge widening and strengthening
Hjar Ennhal bridge structural strengthening
Hammersmith innovative post-tensioning system
Pertuiset bridge – Stay cables replacement
LH Ford bridge reinforced to support additional load capacity
Learn more about our repair solutions per type of structure
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You have a project?
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