A overview of recent challenges in prestressed concrete, by Freyssinet and Gamaco.

1. Recent challenges and advances on
PRESTRESSED CONCRETE design and construction
FIB Belgium Colloquium – June 5th 2013
François LEPERS, Ir
CEO of GAMACO sa

2. Recent challenges and advances on
prestressed concrete design and construction
• Classical applications in buildings : PT SLABS
▫ Flat slabs
▫ Other PT slab structures
▫ examples
• Other particular cases

3. PT slabs (1)
• Typical structure : flat slabs
▫ bi-directional behavior – no beams
▫ Classical Span/depth ratio : L/30 to L/45
▫ Admissible spans : 6 to 12 m
▫ Common applications : office buildings, hotels, car parks, commercial center,…

4. PT slabs (2)
• Other PT slab possibilities
▫ Larger spans (up to 16m) ; heavy loadings, self-weigth reduction

5. PT slabs (3)
• AZ Groeninge – Kortrijk – 110 000m²
▫ Flat slab 250mm
▫ Typical grid : 8.1m x 8.1m

6. PT slabs (4)
• Euromed – Marseille – 45 000 m²

7. PT slabs (5)
• Parking casino Aix-en-Provence – 28 000 m²
▫ Grid 16.0m x 7.0m – waffle slab 400 mm

8. PT slabs (6)
• Commercial center and parking LECLERC – Roques (Toulouse) 35 000 m²
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Grid 16.0m x 8.0 m
PT beams 1000 x 600 mm
PT slab 200mm

9. PT slabs (7)
• Public Car Park – La Garde (Toulon) - 12500 m²
▫ Grid 16.0m x 6.0 m
▫ Parking : flat slab 350 mm
▫ Roof ( DL+LL = 12+10kPa) : 550 mm

10. Recent challenges and advances on
prestressed concrete design and construction
• Classical applications in buildings : PT SLABS
• Other particular cases:
▫ Load transfer structures
▫ Long cantilevers

11. Load transfer structures (1)
• Cité Judiciaire - Luxemburg
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Bi-directional flat slab
Max spans : 17.0m
Slab thickness = 130cm

12. Load transfer structures (2)
• Auditorium – Bordeaux
o Transfer beams - spans 32m.
o Section : 2.0m x 2.2m

13. Long cantilevers (1)
• Residential building – Temse
▫ Flat slab 240mm – cantilever = 4.0m

14. Long cantilever(2)
• Hotel de région - Toulouse
▫ Public office building
▫ PT truss beam
▫ Cantilever 6.0 m

15. Long cantilevers (3)
• Twarda tower – Warsaw – Poland
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High-rise building (160m)
44 levels
Cantilever 11m
PT Hangers

16. Long cantilevers (4)
• Maison du Savoir - Luxemburg
▫ PT slabs and PT Walls
▫ 2 cantilevers : 25m each
▫ 1 central span : > 50m

17. Recent challenges and advances on
prestressed concrete design and construction
• Classical PT slab structure :
o economies in concrete, steel, CO2, €
• Architectural challenges
o Prestressed concrete can be an efficient solution
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