innovative structural slab practices

8/9/2019 Innovative Structural Slab Practices

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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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A

• H O

• CI D G

• N C – M A M

– 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

A


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D

C C:• ACI 318

• O IBC ()

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D C

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D C

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• 5.5 12 3/8

• 1 3/8

• 0.25 3/2

• 125 88 30%

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D C

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• 0.56 3/2

• 269 185 31%

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C C


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C C


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C C


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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

•

• •

• C • ?

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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B

E

. A ,

.


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I

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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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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• F MP ,

.• 44 10 ,

5/8 E.

C: 2 ; 21/2

/ .

5,000 / 6,000

.

A (A)

D: G, , D C: & , B,


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E A: A, ,

E & /E E: A, , C : & A., F

C C:

B C / ., & 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 [email protected]: (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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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



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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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169(courtesy of KPFF)

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.

innovative structural slab practices

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