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.
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Applications
Bridges
Buildings
Heritage structures
Industrial facilities
Port & waterway structures
Tunnels & culverts
Water infrastructures
Additional prestressing benefits
01. Active reinforcement
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.
02. Very high capacity
Additional prestressing is used to relieve bent elements of insufficient strength or stiffness by compensating for the effects of part of their permanent loads.
03. High durability
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.
Main use cases
– Increased dead loads
– Increased service, wind or snow loads
– Corrosion of internal prestressing steel
– Stress relaxation of prestressing steels
– Change from isostatic to multi-span beam
– Connect adjacent buildings for higher seismic resilience
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
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Low service disruption
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Fast installation process
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Low aesthetic impact
Strengthening of bridges
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Very high reinforcement capacity
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Compact solution
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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
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Low service disruption
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High durability
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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
Learn more about our repair solutions per type of structure
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You have a project?
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