The Girder-Slab® System Design Guide v3.1 LRFD

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Mid to high-rise residential structures have traditionally used a cast-in-place reinforced concrete structural system which offers such benefits as low floor to floor height and fireproof construction. With similar benefits, low to mid-rise buildings often utilize bearing wall systems supporting precast slabs. These structural systems are time consuming, weather sensitive and labor intensive.

An innovative design with a conventional approach. Girder-Slab® Technologies, LLC set out to develop a more efficient structural steel based framing system for mid and high-rise residential construction. Utilizing proven materials that have long been used by the construction industry, the Girder-Slab® System is designed by the owner’s architect and structural engineer and is available competitively from the builder’s customary steel fabricators. The components of the system, structural steel (including the D-Beam® Girder) and precast hollow-core slabs, can be manufactured and supplied by many subcontractors guaranteeing the owner competitive procurement of the building’s superstructure.

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The D-Beam® Girder With practically an unlimited source of supply, the D-Beam Girder is manufactured by your local steel fabricators as part of a complete structural steel package. The D-Beam fabrication process begins with a standard wide flange section that when uniquely cut through the web produces two equal but opposite T sections. The fabricator then welds a flat bar to create the top flange resulting in two D-Beams from one parent beam without waste.

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Neutral Axis Slab Grout Steel

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WEB INCLUDED

DEPTH

WEB

WEIGHT

AVERAGE AREA

d

THICKNESS tw

lb/ft

in2

in

in

DB 8 x 37

36.7

10.8

8

3/8

DB 8 x 39

39.2

11.5

8

DB 8 x 42

41.8

12.3

DB 8 x 45

44.3

DB 8 x 57 DB 8 x 61

PARENT BEAM a

b

TOP BAR wxt

in

in

in x in

W 12 x 53

2

5

3x1

3/8

W 12 x 58

13/4

51/4

3x1

8

3/8

W 12 x 53

1

51/2

3 x 11/2

13.0

8

3/8

W 12 x 58

3/4

53/4

3 x 11/2

56.5

16.6

8

1/2

W 12 x 79

15/8

53/8

5x1

60.8

17.9

8

1/2

W 12 x 79

1

5

DEPTH

WEB

WEIGHT

AVERAGE AREA

d

THICKNESS tw

lb/ft

in2

in

in

DB 9 x 41

40.7

12.0

95/8

3/8

DB 9 x 45

44.2

13.0

9

DB 9 x 46

45.8

13.5

DB 9 x 48

47.2

DB 9 x 49

8” D-BEAM DESIGNATION

WEB INCLUDED

SIZE

1/8

5/8

PARENT BEAM

5 x 11/4

a

b

TOP BAR wxt

in

in

in x in

W 14 x 61

33/8

51/4

3x1

7/16

W 14 x 68

3

5

3x1

95/8

3/8

W 14 x 61

23/8

53/4

3 x 11/2

13.9

913/16

7/16

W 14 x 74

31/2

55/16

3x1

49.3

14.5

93/4

7/16

W 14 x 68

21/2

53/4

3 x 11/2

DB 9 x 52

52.3

15.4

913/16

7/16

W 14 x 74

21/2

513/16

3 x 11/2

DB 9 x 57

56.5

16.6

93/4

1/2

W 12 x 79

51/8

35/8

5x1

DB 9 x 65

65.0

19.1

93/4

1/2

W 12 x 79

41/8

41/8

5 x 11/2

9” D-BEAM DESIGNATION

3/4

SIZE

1/2

1/4

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Sample Calculations LRFD

8” D-Beam DB 8 x 61 with 8” Hollow-Core


LRFD 9” D-Beam DB 9 x 65 with 10” Hollow-Core

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PRECAST CONCRETE SLAB

GROUT

(1) LAYER GYPSUM BOARD (REFER TO U.L. K912)

OPTIONAL GYPSUM BOARD & METAL STUD PARTITION

PIPING & MECHANICAL CHASE

SPRAY FIREPROOFING (REFER TO U.L. K912) OPTIONAL GYPSUM BOARD & METAL STUD PARTITION

PRECAST CONCRETE SLAB

D-BEAM® DB8

8”

8”

GROUT

GROUT

OPTIONAL CROWN MOLDING

PRECAST CONCRETE SLAB

D-BEAM® DB8

PRECAST CONCRETE SLAB

D-BEAM® DB8

8”

8”

D-BEAM® DB8

GROUT

STRUCTURAL, PIPING, & MECHANICAL CHASE 11 1/4” MIN.

11 1/4” MIN.

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Fire Resistance Information Fire Resistance Rating — ANSI/UL 263 Design No. K912 April 19, 2001 Restrained Assembly Ratings — 3 Hr. Unrestrained Assembly Ratings — 2 Hr. Unrestrained Beam Ratings — 2 Hr. ALSO AVAILABLE IN CANADA Summarized from UL #K912. Please refer to the current online Certifications Directory for modifications or updates.

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GIRDER-SLA B速 DES I GN GU I DE V 3 .1

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09 Gypsum Wall Board Ceiling

11 UL K912

10 Eliminate Beam Penetrations

12 Various Architectural Designs






GIRDER SLAB

COMPOSITE STEEL AND PRECAST SYSTEM

REVERSE

GIRDER SLAB

COMPOSITE STEEL AND PRECAST SYSTEM

POSITIVE

FONTS: ITC LUBALIN GRAPH DEMI & HELVETICA BOLD

COLORS: PMS 146 & BLACK


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