icf suspended concrete floors & roofs · pdf fileconventional suspended slab •...
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ICF Suspended Concrete Floors & Roofs
Presentation by
Douglas Bennion
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ICF Industry Partnership
• ICF manufacturers
• Ready-mixed Concrete
Industry
• More high-performance
concrete buildings
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Insulating Concrete Formwork
ICF Products
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ICF Floor & Roof Construction
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ICF/Concrete Building Shell
Walls Floors
Roofs
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© 2013 Quad-Lock Building Systems, Ltd
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ICF Progress in the Market
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How Does It Work?
…just like a floor joist!
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A “Pan Form” for T-Beam Panel Construction
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How Does It Work?
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“One-way” Slab Design
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• Resists shear and bending forces
• 40% lower mass reduces accelerated loads
• Long span capacity (30’ +)
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T-Beam Evolution
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COMPRESSION
NEUTRAL
TENSION
LEAVE AS IS
MINIMIZE THIS SECTION
ADD REBAR
COMPRESSION
NEUTRAL
TENSION
LEAVE AS IS
MINIMIZE THIS SECTION
ADD REBAR
COMPRESSION
NEUTRAL
TENSION
LEAVE AS IS
MINIMIZE THIS SECTION
ADD REBAR
COMPRESSION
NEUTRAL
TENSION
LEAVE AS IS
MINIMIZE THIS SECTION
ADD REBAR
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Two Important Design Concepts:
“Two-way” versus “One-way” slab reinforcement Where is the load carried to?
“Flat-plate” design versus “Voided” slab Can we eliminate unnecessary materials?
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Conventional Suspended Slab
• “Two-way reinforcement
• Carries loads to all edges
• Highest mass option
• Largest supporting
elements
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“One-Way” Voided Elevated Slab
• “One-way” reinforcement
• Carries loads to two edges
only
• Lowest mass option
eliminates more concrete
• Reduces steel
consumption
• Requires smallest
supporting elements
Best overall efficiency in design
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Increase Spans By:
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• Adding supporting beams
• Increasing height of T-beams
• Post-tensioning
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Typical Floor-to-Wall Connections
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Multiple Family Occupancies
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7.6 m (25‘) Single Span: 280mm (11“) QD + 64mm (2.5“) Slab
@ 50 psf LL
Concrete needed 14 cu.M
Top Reinforcement 6x6 WWM 130 kg
Bottom Reinforcement 2-19m @ 610 O.C. 1308 kg
Quad-Deck Z-Strips Spaced @ 305 O.C. 408 kg
1846 kg
7.6 m (25‘) Single Span: 203mm (8“) Conc. Slab
@ 50 psf LL
Concrete needed 28 cu.M
Top Reinforcement 13m @ 305 O.C. E/W 850 kg
Bottom Reinforcement 19m @ 305 O.C. E/W 1910 kg
2760 kg
Compare Concrete Slab vs. Quad-Deck
68,200 kg
34,100 kg
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Elevated Slabs
Resist Storm Surge
Elevated SFR – Treasure Isle, LA
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Elevated SFR – Treasure Isle, LA
Residence Building Facts:
• Post-Katrina rebuild
• ICF/ concrete “sandwich” (Floor – Walls – Roof)
• Compliant to IRC, ACI-318, & ASCE-24
• Seismic zone ‘A’
• Wind 130mph – Exposure C
• 20’-2” above MSL
• 13’-6” above grade
• BFE = 15’ above MSL
• Helical piers to 31’6” below grade
• Frangible parking slab
• Exceeds IECC 2012 insulation requirements
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ICF Suspended Concrete Floors/Roofs
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Questions?