Recent challenges and advances on PRESTRESSED CONCRETE design and construction

FIB Belgium Colloquium – June 5th 2013

François LEPERS, IrCEO of GAMACO sa

• Classical applications in buildings : PT SLABS▫ Flat slabs▫ Other PT slab structures▫ examples

• Other particular cases

Recent challenges and advances on prestressed concrete design and construction

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,…

PT slabs (2)• Other PT slab possibilities

▫ Larger spans (up to 16m) ; heavy loadings, self-weigth reduction

PT slabs (3)• AZ Groeninge – Kortrijk – 110 000m²

▫ Flat slab 250mm▫ Typical grid : 8.1m x 8.1m

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

PT slabs (5) • Parking casino Aix-en-Provence – 28 000 m²

▫ Grid 16.0m x 7.0m – waffle slab 400 mm

PT slabs (6) • Commercial center and parking LECLERC – Roques (Toulouse) 35

000 m²▫ Grid 16.0m x 8.0 m▫ PT beams 1000 x 600 mm▫ PT slab 200mm

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

Recent challenges and advances on prestressed concrete design and construction

• Classical applications in buildings : PT SLABS• Other particular cases:

▫Load transfer structures▫Long cantilevers

Load transfer structures (1)• Cité Judiciaire - Luxemburg

▫ Bi-directional flat slab▫ Max spans : 17.0m▫ Slab thickness = 130cm

Load transfer structures (2)• Auditorium – Bordeaux

o Transfer beams - spans 32m.o Section : 2.0m x 2.2m

Long cantilevers (1)•Residential building – Temse

▫ Flat slab 240mm – cantilever = 4.0m

Long cantilever(2)• Hotel de région - Toulouse

▫ Public office building▫ PT truss beam▫ Cantilever 6.0 m

Long cantilevers (3)•Twarda tower – Warsaw – Poland

▫ High-rise building (160m)▫ 44 levels▫ Cantilever 11m ▫ PT Hangers

Long cantilevers (4)•Maison du Savoir - Luxemburg

▫ PT slabs and PT Walls▫ 2 cantilevers : 25m each▫ 1 central span : > 50m

Recent challenges and advances on prestressed concrete design and construction• Classical PT slab structure :

o economies in concrete, steel, CO2, ۥ Architectural challenges

o Prestressed concrete can be an efficient solution

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