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Session sponsored by ACI/ASCE 421
Mike Mota Ph.D., P.E., F.ASCE
CRSI - Atlantic Region Manager
Session Moderator
April 14, 2013
Minneapolis, MN 1
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– LB A
– H M C
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Tests of RC Hollow Tile(Purdue U.- Oct. 1907)
Source: W. K. Hatt
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Load Test Results
• Slab designed for 100 psf (LL)• Maximum LL
– 510 psf at yield
– 710 psf at end of test• Max. Deflection – 3” deflection caused slab to bottom out ~ L/75
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Purdue University - Oct. 1907
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Source: USPO 1909
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Source: Concrete-Cement Age: August 1914
Use of Cores in RC Floors
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Source: USPO 1916
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(two-way) slab - 1915
Structure Magazine (2008)
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Ida B. Wells Housing (Chicago)
Source: Journal of ACI (Nov, 1941)
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Journal of ACI (Nov, 1941)
• 124 Buildings• 3,000 tons of rebar
• 46,000 cy of concrete
Ida B. Wells Housing (Chicago)
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Journal of ACI (Nov, 1941)
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CI Article
(May 1983)
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Cost (sq. ft.) Comparison
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Anchoring The Voids
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Anchoring The Voids
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Flat Terra Cotta Arch
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Slag Block
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Wide-Module Joists
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Waffle Slabs
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Hollow Core Plank
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Foam voided Systems
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Questions?
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C D G
Attila Beres Ph.D., P.E.
CRSI – Senior Structural Engineering Consultant
Session sponsored by ACI 421
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AirportYerevan, Armenia
Millenium Tower Rotterdam, Netherlands
Palazzo LombardiaMilan, Italy
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New Trends - Case Studies:
Miami Art Museum
UW LaBahn ArenaHarvey Mudd College
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A C
ACI 421 Session on Innovative Slab Design
VOIDED SLAB TECHNOLOGYOPTIMIZING DESIGN AND IMPROVING
CONSTRUCTABILITY
Michael A. Russillo, PresidentCobiax USA Inc.
April 14, 2013.
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• B
•
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P A M M (PAMM)
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• : F 2013• 4 : 120,000; 80,000
• 6 80,000 • E C / A • D:
–
– 4 6 – 2 – – EED C
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Hollow voids of recycled plastic, positioned in appropriate zones of flat plate
slabs, contribute to dead load reduction without modifying flexural strength and
load transfer to supports.
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Top static reinforcement
void cage modules
Bottom static reinforcement
Formwork & bracing
The void cage modules take over the
function of the wire chairs
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C ( )
1st concreting stage: Anchorage layer toprevent buoyancy
2nd concreting stage: Remainingconcrete after initial setting of 1st
layer
x hours
Top static reinforcement
void cage modules
Bottom static reinforcement
Formwork & bracing
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D CAGE AGE E
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Sunrise on Biscayne Bay
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M I
Sunrise on Biscayne Bay.
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Installing & Spacing Voids
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450 mm voids
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Clean-out before theconcrete placement
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Mockup
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A :E C / /
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E C
E / 4 & 6
@
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@ 26 ..
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Upturned Beam
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A
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B
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EXPOSED BEAMS
M B
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M B
I B
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F
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I
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CC EECE
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• GO AEA: 200,000 : 120,000 + 80,000
• OAL CONCEE ADAGE: 17,500 C; 6,000
: C ( A)
MIAMI A MEM
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: C ( A)
• OAL EBA ONNAGE: 3,000 : G
• OID COEED AEA: 80,000
• 6 OID IE: 180, 220, E225, E270, E360 & E450• OLME OF CONCEE DIPLACED: 935 C
• EIGH EDCION ON PILE: 1,750
• : / (MDO )
510 F F .
F M P
A A E F C
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.• 44 10 ,
5/8 E.
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5,000 / 6,000
.
A (A)
D: G, , D C: & , B,
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Perez Art Museum Miami (PAMM)
THANK YOU ! THANK YOU ! THANK YOU ! THANK YOU !
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Inquiries: Michael A. Russillo, PresidentCobiax USA Inc.90 Pleasant StreetDedham, MA 02026 mrussillo@cobiaxusa.comTel: (781) 381-0111 Internet: www.cobiaxusa.com
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Voided Slab w/ precast stay in place form
• Voided Two-Way Flat Plate
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y
• Use plastic spheres (bubbles) todisplace concrete
• Designs and Behaves like monolithicconcrete
• A merger of the best aspects of cast in
place and precast concreteconstruction
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Voided Slab w/ precast stay in place form
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Voided Slab w/ precast stay in place form
Site formedclousure strip
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Shear zone, no ballarea, ~25% of span
Shear capacity atbubbles equals 60%of shear capacity of asolid slab
clousure strip
Voided Slab w/ precast stay in place form
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Voided Slab w/ precast stay in place form
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UW LaBahn ArenaMadison WI
BIM Structural Model –
LaBahn Arena
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LaBahn Arena
• 21 inch Voided slab
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– Plaza Slab• Supports 3.5 feet of soil
• Designed for fire truck loading• 11,000 Square Feet
• Serves as roof of Badger hockey locker
rooms
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BD
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Why Voided Slab for UW LaBahn?
• Saved $2/SF
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• Saved 174 CY of concrete
• Saved 3 days off of schedule
• Saved on shoring cost
• Saved structural depth
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Harvey Mudd CollegeTeaching and Learning Building
Claremont, CA
BIM Structural Model – Harvey Mudd College
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Harvey Mudd - TLC
• 4 –Story Education Building
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• 80,000 square feet of Voided slab• 9, 11, 13.5, 17.5 and 20 inch slab thicknesses used
• Located in high seismic zone
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Why Voided slab for Harvey Mudd?
• Highly Visible Exposed Concrete Ceilings
• MEP Coordination/Pre Installation
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• MEP Coordination/Pre-Installation• Seismic Mass Reduced
• Long-term Deflection Considerations
• Saved 750 CY of Concrete
Watertown Regional Medical Center
East Addition
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East Addition
Watertown, WI
Watertown Regional Medical Center
• Emergency Dept & Women’s Health Addn
• 2-Story & 30,000 square feet
• Existing construction systems:
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• Existing construction systems: – Concrete waffle slabs
– Concrete pan joist
– Precast concrete and steel beams• System selection for healthcare facilities
– Grid layout
– Story height
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Why Voided slab for WRMC?
• Flexible and larger column grid• Thin structural system leads to higher headroom for
MEP/medical systems.
• Material savings
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Material savings• Increased construction speed by minimizing on-site
labor
Summary
• Form work is virtually eliminated. Fewerlines of shoring.
Th fi i h d d id f th l b
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• The finished underside of the panel can beleft exposed and untreated.
• Overall building height is minimizedreducing building façade.
Summary Cont.
• Reduced site labor, increased safety.
• Less onsite concrete, quicker pour time.
• Core holes are faster to drill.
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Core holes are faster to drill.• Building is more efficient, reduced carbon
footprint, has potential for LEED credits.