MEGA-TEES in yard

The Double Tee

Our revolutionary pre-topped 12'-, 15'- and 16'-wide, long-spanning, 30"-deep MEGA-Tees provide reliable, stable performance as the driving surface in precast parking structures. 15'- and 16'-wide tees can be used to build 45' and 48' bays that are open and bright and reduce the number of members required and with it the number of joints that must be maintained. 16'-wide MEGA-Tees are especially efficient for end bays, providing increased space for turning.

  • MEGA-TEES in yard
  • Dry Diaphragm Connection
  • Truck with MEGA-TEE
MEGA-Tees in yard

MEGA-Tee Pretopped Double Tee of high strength concrete, 15’ or 16’ in width, up to 60’ in length, with primary reinforcement of 1/2" special strands of high tensile steel strand pulled to 31,200 lbs. to achieve design requirements. 3-1/2" to 4-3/4” flange contains wire mesh (secondary) reinforcement. Component may be warped to achieve drainage. MEGA-Tees are supplied with a standard broom finish with swirl pattern for wet-weather traction.

Applications

MEGA-Tee Pretopped Double Tees comprise the main traffic and parking surfaces within precast concrete parking garages, and may be used as decking and roofing elements on other structures.

Cost

$$-$$$

Maintenance

MEGA-Tee Pretopped Double Tees shall be kept free of dirt, debris and chloride-laden water. Snow removal equipment shall use a rubber-tipped blade. Total distributed weight of such equipment shall not exceed 50 lbs/sq.ft.

 

Manufacturing

MEGA-Tee Pretopped Double Tees will be manufactured in accordance with PCI guidelines in a PCI-certified precast manufacturing facility.

Connections

Connections for seismic diaphragm may be welded or field-topped pour strips

  • Tee to spandrel – pocket or haunch (corbel) gravity connection

Welded (diagram)

Field-topped pour strip (diagram)

  • Tee to wall – lateral connection

Welded (diagram)

Field-topped pour strip (diagram)

  • Tee to inverted “T” girder – lateral connection

Welded (diagram)

Field-topped pour strip (diagram)

  • Tee to tee – lateral connection, welded, using Vector Connector® or equal connection device

Welded (diagram)

Concrete

Mix: 50% recycled content (per design requirements)

Water-cement ratio: less than or equal to .38

Strength: 7-9,000 psi

Color: structural buff or gray

Fire Performance

ASTM E 119

3-1/2" flange: 1 hour

4-3/4” flange: 2 hours

Reinforcing

Primary reinforcement – 1/2" dia. low relaxation special strands, 270ksi special, A = 0.167 in2

Transverse reinforcement – welded wire fabric

Specifications

Certification . . . . . . . . . . . . . . . . . PCI Certification

Design. . . . . . . . . . . . . . . . . . . . . . ACI 318

Prestress strand . . . . . . . . . . . . . .  ASTM A 416

Reinforcing steel. . . . . . . . . . . . . . ASTM A 615

Welded wire fabric . . . . . . . . . . . . ASTM A 185

Structural steel . . . . . . . . . . . . . . .  ASTM A 36

Aggregate. . . . . . . . . . . . . . . . . . .  ASTM C 33

Cement. . . . . . . . . . . . . . . . . . . . .  ASTM C 150 Materials

Dimensional Tolerances:

Length . . . . . . . . . . . . . . . . . . . . . .  ± 1/8 in. per 10 ft. 1 in. max.

Width & Depth . . . . . . . . . . . . . . . .±1/4 in.

Stem width . . . . . . . . . . . . . . . . . . . ±1/8 in.

Flange Thickness . . . . . . . . . . . . .   ±1/8 in.

Horizontal alignment: 1/4"

Differential vertical alignment of adjacent floor members: 1/4"

Position of Blockouts and Inserts: ±1/2 in.

Position of Weld Plates: ±1 in.

Erection

MEGA-Tee Pretopped Double Tees may be erected by PCI-certified or qualified erection crews. Tees and other parking garage components will be tested by an independent testing firm.

Options

Blockouts – prefabricated plastic forms, fit into stems to facilitate mechanical, electrical and plumbing installations (www.highconcreteaccessories.com)

Burke Lift Covers – prefabricated plastic lifter covers in standard and custom colors

Corrosion inhibitors – calcium nitrate (CNi) may be added to the concrete mix to help control corrosion of mild steel reinforcement

Curbs – prefabricated and mechanically attached curbs for car stoppage

Custom configurations – cuts, penetrations and form alterations including warping according to design requirements

Support

Haunches – haunches or corbels may be used as support in walls. The legs of the Pretopped Double Tees will rest on the haunch.

Ledges – ledges may be used to provide support to double tee ends.

Pockets – in some applications it may be appropriate for double tees to be manufactured to fit into a preformed pocket in a wall providing a cleaner visual.

Related Work

Cast-in-place diaphragms – field-applied pour strips may be used to attain seismic diaphragm performance. This work is performed by others.

Sealers – pretopped double tee decks may be treated with a field-applied sealer to help control corrosion of mild steel reinforcement.

Sealants – caulking of double tee joints is required to ensure watertight performance of the deck. This work is performed by others.

Following are standard load tables for uniformly loaded simple spans. These tables are for guidance only. Individual designs may be furnished for unusual loading conditions, changes in cross section, low camber requirements, etc.

 

Notes

1. Load span charts are intended for preliminary design only and are based on:

(a) Horizontal single span with unrestrained ends, no cantilever
(b) Uniform superimposed live load (dead load of tee has been deducted)
(c) f’ci = 3000 PSI min. at transfer
(d) Max. extreme fiber stress in tension under full load = 850 PSI

2. Tees will be manufactured with camber. Amount varies with design requirements and will be shown on shop drawings.

3. Tee widths shown are maximums, flanges may be reduced as required.

4. Standard finishes:

TOP: as per designer’s requirements;
BOTTOM & SIDES: smooth from steel forms.

5. Consult High Concrete Group for further assistance.

6. UL ratings available upon request.

 

 Load Test Data - 15' MEGA-TEE with 26Load Test Date for 15' MEGA-TEE with 28Load Test Date for 15' MEGA-TEE with 30Load Test Data for 15'-wide MEGA-TEE with 34

Potential precast point contributions to LEED certification:

Credit

Title

LEED 2009

Sustainable Sites

 

 

SSc5.1

Site Development, Protect or Restore Habitat

1

SSc7.1

Heat Island Effect, Non-Roof

1

Materials & Resources

 

 

MRc4.1

Recycled Content, 10% (post-consumer + pre-consumer)

1

MRc5.1

Regional Materials, 10% Extracted, Processed & Manufactured Region

1

MRc5.2

Regional Materials, 20% Extracted, Processed & Manufactured Region

1

Innovation & Design Process

 

 

IDc1.1

Innovation in Design: Provide Specific Title

1

IDc2

LEED® Accredited Professional

1

 

LEED is a registered trademark of the US Green Building Council.