pt structures in buildings
DESCRIPTION
Post-tensioning in buildings : presentation given for the GBB-BBG on September 09th 2014.TRANSCRIPT
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Practical applications of post-tensioned concrete in buildings
09/09/2014 – GBB – Le béton post-contraint
François LEPERS CEO of GAMACO Ingénieurs-Conseils
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Post-tensioned slabs (PT slabs) (1)
2 effects of the post-tensioning on the structures:• Compression force• Balanced loads
Global impact on the building design:• reduced structure height• No beams needed
PT slabs can be used in all kind of buildings : office buildings , apartment's building, hospital, commercial center's, parking's, sport infrastructures, …
Sketches from commercial documentation Freyssinet
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Post-tensioned slabs (PT slabs) (2)
Specific design consideration regarding to PT structures
The slab has to be able to shorten freely at jacking (elastic shortening due to the compressive forces)
When unfavorable cases occurs, specific execution details can be adopted to maximize the compression force in the slab.
Sketches from PT-structures.com
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Post-tensioned slabs (PT slabs) (3)
Execution design studies : usually in charge of specialized sub-contractors, as it is also the practice in the industry for precast elements
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Flat PT slabs (1)
bi-directional behavior – no beams
Classical Span/depth ratio :(Hyperstatic slabs)
Admissible spans : usually 6 to 12 m, but 16m often used in parking structuresTypical passive reinforcement :
general bottom mesh, top bars over the columns only, punching shear reinforcement and bursting/edge reinforcement
Overloads Span/Depth1.5 kPa Up to L/452.5 kPa Up to L/405.0 kPa Up to L/35
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Flat PT slabs (3)
AZ GROENINGE - KORTRIJK110 000 m² of flat PT slabs:30000m² in 2004 (Cordeel)75000m² in 2013 (CEI De Meyer & Jan De Nul)
Flat slab 250mmTypical grid : 8.1m x 8.1mTypical overloads : 6.0 kPaUnbonded & bonded system
75000m² = 7 months on site !+- 600m²/week/crane
(5 cranes)
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Flat PT slabs (4)
EUROMED CENTER II – MARSEILLE - FRANCE
45 000 m² of flat PT slabsMixed building : parking, hotel, gardens, shopping mall & officesSpans from 6.0m to 8.5m
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Flat PT slabs (5)
DOCKS DE LYON – LYON - FRANCE
3 000 m² of flat PT slabs (currently in progress)6 levels of officesSpans : max 8.5mCantilevers : max 3.5mSlab depth : 300mm, including integrated heating/cooling system (active floor)
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Flat PT slabs (6)
BANK ACCORD – CROIX - FRANCE
8 000 m² of flat PT slabs (2013)- parking (2.5 kPa)- offices (6.0 kPa)Spans : 10.m x 8.5 mSlab depth : 250 / 260mm
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Flat PT slabs (7)
MAISON DES SCIENCES HUMAINES – BELVAL - LUXEMBURG
30 000m² of flat PT slabs (2011-2012)Spans :
12.0m isostatic & 12.0m x 8.0 mOverloads : 6.1 kPaSlab depth : 360 mmMain engineer : BEST
12m
12m 8m
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Flat PT slabs (7)
ARENDT HOUSE – KIRCHBERG - LUXEMBURG
8000m² of flat PT slabs (2013)Spans : Maximum 17.0mOverloads: 6.0 kPaSlab depth : 35 cmMain engineer : INCA
17m
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Flat PT slabs (8)
GHELAMCO ARENA - GENT
10000m² of flat PT slabs (2013)Spans : 10m x 10 mOverloads : 5.0 kPaSlab depth : 300 mm
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Flat PT slabs (9)
PUBLIC PARKING – LA GARDE - FRANCE12500m² of flat PT slabs (2012)2 levels of parking1 roof level with high loadingsSpans : 16.0m x 6.0 mOverloads :
Parking 2.5 kPaRoof 22.0 kPa
Slab depth :Parking 350 mmRoof 550 mm
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Flat PT slabs (10)
PUBLIC PARKING – BETHUNE - FRANCE
10000m² of flat PT slabs 2 levels of parking1 roof level with high loadingsSpans : 16.0m x 6.0 mOverloads :
Parking 2.5 kPaRoof 25 to 30 kPa
Slab depth :Parking 350 mmRoof 550 mm
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Flat PT slabs (11)
PUBLIC PARKING – BETHUNE - FRANCE
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Flat PT slabs with drop panels (1)
bi-directional behavior – no beams
Classical Span/depth ratio :(Hyperstatic slabs)
Admissible spans : from 10 to 16m
Overloads Span/Depth2.5 kPa Up to L/455.0 kPa Up to L/40
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Flat PT slabs with drop panels (2)
COMMERCIAL CENTER IKEA – MOSCOW - RUSSIA
15 000m² of flat PT slabsProject of commercial centerSpans : 16.0m x 16.0 mOverloads : 15 kPaSlab depth : 400mm + capital 4000x4000x300mm
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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slabs with PT beams (1)
one-directional behavior
Classical Span/depth ratio :(Hyperstatic slabs)
Typical example : grid 16.0m x 8.0m
Overloads PT Slab Span/Depth
BeamsSpan/Depth
2.5 kPa Up to L/45 Up to L/255.0 kPa Up to L/40 Up to L/20
bi-directional behavior
Classical Span/depth ratio :(Hyperstatic slabs)
Typical example : square grids from 12.0m to 20.0 m
Overloads Slab Span/Depth
BeamsSpan/Depth
2.5 kPa Up to L/45 Up to L/305.0 kPa Up to L/40 Up to L/25
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Slabs with PT beams (2)
PARKING & COMMERCIAL CENTER LECLERC – ROQUES (TOULOUSE) - FRANCE
35 000 m²Spans : 16.0m x 8.0 mOverloads : 2.5 kPaSlab depth : 200 mmBeams : 1000x600mm
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Slabs with PT beams (3)
PARKING OF THE AIRPORT – ISTANBUL - TURKIE
35 000 m²Spans : 16.0m x 16.0 mOverloads : 5.0 kPaSlab depth : 30cmFlat beams : 300x60cm
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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bi-directional behavior
Classical Span/depth ratio :(Hyperstatic slabs)
Admissible spans : up to 16m
Waffle PT slabs (1)
Overloads Span/Depth2.5 kPa Up to L/305.0 kPa Up to L/25
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Parking 28 000 m²Grid 16.0m x 7.0m Waffle slab 400mm
Waffle PT slabs (2)
PARKING OF A COMMERCIAL CENTER - AIX-EN-PROVENCE - FRANCE
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Ovoïdal shape in plan view Waffle slab with variable thickness
Waffle PT slabs (2)
ERNST&YOUNG - KIRCHBERG - LUXEMBURG
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Lightened PT slabs (1)
Basic solution : polystyrene blocs (IMEC tower)Other solutions : Cobiax, Uboot, Bubbledeck, …
The self-weight reduction is typically about 20% to 30% with this kind of solution.This allows to reduce the PT and RC ratios in the slabs.
The economical balance has to be checked between material earnings and weight-reducing element costs.
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Lightened PT slabs (2)
PARKING ARLEQUIN – GRENOBLE - FRANCE
11 000 m² of lightened slabs (2013)Isostatic spans : 10.5 mOverloads : 2.5 kPaSlab depth : variable from 30 to 35 cmLightening elements : Uboot
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Lightened PT slabs (3)
TWARDA TOWER – WARSAW - POLAND
25 000 m² of lightened slabs (2012)High-rise building – 44 floorsmax spans : 9.20mSlab thickness : 230 mm + Cobiax SL 120Overloads : 5.0 kPa
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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PT slabs on wide slabs (1)
MAISON DU SAVOIR – BELVAL - LUXEMBURG
Cable profile
Typical section
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PT slabs on wide slabs (2)
MAISON DU SAVOIR – BELVAL - LUXEMBURG
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PT slabs on wide slabs (2)
BRUSSELS AIRPORT - ZAVENTEM
Terminal & Pier B150 000 m²
Grid 8.0m x 8.0m
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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PT Foundation rafts (1)
WATER TREATMENT PLANT OF BRUSSELS NORTH - BRUSSELS
Foundation raft on piles : 25 000 m²Other PT slabs : 50 000m²General contractor : Jan De NulPiled raft supporting 10m of water
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PT Foundation rafts (2)
HALA CZYZYNY - POLAND
Sport hall (Hockey)Foundation raft : 12 500m²Spans : up to 12m Thickness : 1000mm
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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PT transfer structures (1)
Particularities : • Initial stage is often critical (reversed moment conditions)
• Staging of the construction / jacking sequences
High tensile stresses + cracks
Finitial = 0
Finitial = 0
100% PT force
50% PT force
Finitial = 40%
100% PT force
Finitial = 100%
50% PT force
Finitial = 40%
100% PT force
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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PT transfer beams (1)
AUDITORIUM - BORDEAUX8 isostatic beams 32 mSuperior building with 4 concrete level to support over a spectacle hallBeams 200 x 220 cm
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PT transfer beams (2)
HOTEL DE REGION – TOULOUSE - FRANCE
PT truss beamPT in the tie elements of the trussCantilever 6.0m
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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PT transfer slabs (2)
APPARTMENT BUILDING - TEMSE
PT transfer slabs240 mm
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PT transfer slabs (2)
CITE JUDICIAIRE - LUXEMBURGBi-directional flat slabMax spans : 17.0mSlab thickness : 130 cmLoadings : 6 levels height building
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Wall post tensioning (1)
MAISON DU SAVOIR – BELVAL - LUXEMBURG2 cantilevers : 25m each1 central span > 50mMain engineer : Jan Van Aelst
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Wall post tensioning (2)
MAISON DU SAVOIR – BELVAL - LUXEMBURG
2 facade walls2 inner walls
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Wall post tensioning (3)
MAISON DU SAVOIR – BELVAL - LUXEMBURGInner walls
Central span 50 m Tower basement Right cantilever25 m
Dilatation joint
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Wall post tensioning (4)
MAISON DU SAVOIR – BELVAL - LUXEMBURGInner walls
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Wall post tensioning (5)
MAISON DU SAVOIR – BELVAL - LUXEMBURGFacade walls
Central span 50 m Tower basement Right cantilever25 m
Dilatation joint
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Hangers TWARDA TOWER – WARSAW - POLANDHigh-rise building (160m)
44 levelsCantilever 11m PT Hangers
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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External PT reinforcement of existing structures (1)
Legend:Main beamsCarbon fiber reinforcement of the main beamsExternal PT reinforcement of the secondary beams
EXHIBITION HALLS - CHARLEROI
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Vertical component of the equivalent loads due to PT
External PT reinforcement of existing structures (2)
EXHIBITION HALLS - CHARLEROI
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External PT reinforcement of existing structures (3)
EXHIBITION HALLS - CHARLEROI
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Particular anchor system have been developed for reinforcement of existing structures
External PT reinforcement of existing structures (4)
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Practical applications of post-tensioned concrete in buildings
I. PT slabsI. Flat PT slabsII. Flat PT slabs with drop panelsIII. Slabs with PT beamsIV. Waffle PT slabsV. Lightened PT slabsVI. PT slabs on wide slabsVII. PT Foundation rafts
II. PT transfer structuresI. PT transfer beamsII. PT transfer slabs
III. Special PT applicationsI. Wall prestressingII. HangersIII. External reinforcement of existing structuresIV. Post-tensioned concrete in silo’s
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Annular compression = reduced cracks
PT concrete in silo’s (4)
WATER TREATMENT PLANT – BEAURADE - FRANCE
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Thank you for your attention
Practical applications of post-tensioned concrete in buildings
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