The Girder-Slab® System Design Guide v3.2 LRFD

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v3.2


GIRDER-SLAB速 SYSTEM / DESIGN GUIDE v3.2

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v3.2

G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2


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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G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2


The D-Beam速 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 identical 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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G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2


The Girder-Slab® System and the open web D-Beam® technology are the result of more than fifteen years of research and development. Early testing produced an ASD approach for a rational design of the Girder-Slab® System. In order to develop a rational analysis that would maximize the use of this technology, extensive laboratory testing and analysis was undertaken. This included both small-scale specimens and full-scale assemblies in order to simulate actual bays. Each assembly was load tested well above code required residential live loads. The D-Beam® Girder performed without failure even at these higher loads. Recent, more sophisticated testing enabled us to develop an LRFD approach to the Girder-Slab® System. Design Guide v3.1 LRFD improved upon the previously established structural and economical benefits of the Girder-Slab® System. With simplicity in mind, new D-Beams® have been introduced while others, less commonly used, have been eliminated.

Neutral Axis Slab Grout Steel

The Girder-Slab® System integrates easily with lateral resisting steel braced frames, and concrete or masonry shear walls.

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G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2


Framing Plan Example

W1

0 W1

W1 0

0 HSS STA

W1

IR

0

W1 8 BF

W1 2

DB8

W1

W1

2

0

8

W1 W1 0

DB

2

W1 0

DB8

W1 0

DB8

W1 0

W1 8 BF W1

W1

0

2

W1 8 BF DB8

W10

W1

0

DB8

DB8 DB8

DB8

W10

W1

0

DB8

DB8 DB8

W1

W1

0

BF

8

W2

W10

1

ELE

ELE W2

W2

2

W1

2

W1

2

W10

W1

STA

0

8

W1

1

HSS

0

BF

1

V.

W1

W1

V.

ELE

BF

DB8

8

W1

HSS

W1

8 B F

V.

IR DB8

W1

W1

8

0

DB8

W1

0

W10

W1

0 W1

0

DB8 indicates 8” D-Beam® Girder Section indicates 8” Precast Hollow-Core Slab

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D-Beam速

Dimensions Web Included Weight

Average Area

Web Thickness

Flange Thickness

Flange Width

(tw)

(tf)

(bf)

a

b

w

t

(lb/ft)

(in2)

(in)

(in)

(in)

(in)

(in)

(in)

(in)

(in)

DB 8 x 37

36.7

10.8

8

W 12 x 53

3/8

9/16

10

2

5

3

1

DB 8 x 39

39.2

11.5

8

W 12 x 58

3/8

5/8

10

1 3/4

5 1/4

3

1

DB 8 x 42

41.8

12.3

8

W 12 x 53

3/8

9/16

10

1

5 1/2

3

1 1/2

DB 8 x 45

44.3

13.0

8

W 12 x 58

3/8

5/8

10

3/4

5 3/4

3

1 1/2

DB 8 x 57

56.5

16.6

8

W 12 x 79

1/2

3/4

12 1/8

1 5/8

5 3/8

5

1

DB 8 x 61

60.8

17.9

8

W 12 x 79

1/2

3/4

12 1/8

1 1/8

5 5/8

5

1 1/4

DB 9 x 41

40.7

12.0

9 5/8

W 14 x 61

3/8

5/8

10

3 3/8

5 1/4

3

1

DB 9 x 45

44.2

13.0

9 3/4

W 14 x 68

7/16

3/4

10

3 1/2

5 1/4

3

1

DB 9 x 46

45.8

13.5

9 5/8

W 14 x 61

3/8

5/8

10

2 3/8

5 3/4

3

1 1/2

DB 9 x 48

47.2

13.9

9 13/16

W 14 x 74

7/16

13/16

10 1/8

3 1/2

5 5/16

3

1

DB 9 x 49

49.3

14.5

9 3/4

W 14 x 68

7/16

3/4

10

2 1/2

5 3/4

3

1 1/2

DB 9 x 52

52.3

15.4

9 13/16

W 14 x 74

7/16

13/16

10 1/8

2 1/2

5 13/16

3

1 1/2

DB 9 x 57

56.5

16.6

9 3/4

W 12 x 79

1/2

3/4

12 1/8

5 1/8

3 5/8

5

1

DB 9 x 65

65.0

19.1

9 3/4

W 12 x 79

1/2

3/4

12 1/8

4 1/8

4 1/8

5

1 1/2

Designation

G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2

Depth (d)

Parent Beam Size


D-Beam®

Properties Fy = 50 ksi ASD 9TH

Designation

ASD 14TH

LRFD 14TH

Edition

Edition

Edition

Ix

NAbot DB

Sbot

Stop

Qtop bar

PNAbot DB

Z

Mallow

Mn/Ωb

φbMn

(in4)

(in)

(in3)

(in3)

(in3)

(in)

(in3)

(kip-ft)

(kip-ft)

(kip-ft)

DB 8 x 37

105

2.79

37.7

20.2

14.1

0.51

26.1

50.4

65.0

97.7

DB 8 x 39

108

2.69

40.3

20.4

14.4

0.55

26.5

51.0

66.2

99.5

DB 8 x 42

126

3.32

38.0

27.0

17.7

1.53

35.9

67.6

89.6

134.6

DB 8 x 45

131

3.21

40.8

27.4

18.2

0.85

36.7

68.5

91.5

137.5

DB 8 x 57

169

2.93

57.7

33.3

22.9

0.68

42.4

83.2

105.9

159.2

DB 8 x 61

188

3.22

58.2

39.2

26.0

0.73

50.8

98.1

126.6

190.3

DB 9 x 41

161

3.13

51.4

24.8

18.0

0.55

31.4

62.0

78.4

117.8

DB 9 x 45

173

2.92

59.1

25.3

19.0

0.62

32.6

63.3

81.3

122.2

DB 9 x 46

198

3.79

52.2

33.9

22.9

0.85

44.0

84.8

109.7

164.9

DB 9 x 48

179

2.83

63.1

25.6

19.5

0.65

33.0

63.9

82.4

123.8

DB 9 x 49

215

3.55

60.6

34.7

24.5

0.71

45.4

86.8

113.2

170.2

DB 9 x 52

224

3.44

65.0

35.2

25.3

0.74

45.9

87.9

114.5

172.0

DB 9 x 57

258

3.40

76.0

40.7

29.3

0.64

47.8

101.7

119.3

179.4

DB 9 x 65

314

4.10

76.6

55.7

36.7

0.84

68.1

139.2

170.0

255.5

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Sample Calculations LRFD

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

Note: Graphical representation only. The online D-Beam Calculator Reference Tool v3.1 is intended for use only with assemblies identical to S1 and S3 in Girder-Slab Design Guide v3.2. G IRD E R- SL AB ® D E SI GN GUIDE v 3 .2


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

Note: Graphical representation only. The online D-Beam Calculator Reference Tool v3.1 is intended for use only with assemblies identical to S1 and S3 in Girder-Slab Design Guide v3.2. GIRDER-SLA B® DES I GN GU I DE V 3 .2

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G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2


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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SPECIFYING THE GIRDER-SLAB® SYSTEM TECHNOLOGY v3.2 The Girder-Slab® System Design Guide v3.2 and technology is available for use by industry professionals. Application and use of this information requires design by a registered professional structural engineer. Structural Engineers are asked to add the following Girder-Slab® System Specification Guide to the General Notes section of their construction documents. The Specification Guide and the Typical System Structural and Architectural Details are available in both CAD and PDF formats on the Design Team Resources page of the Girder-Slab website. www.girder-slab.com The Girder-Slab® System and D-Beam® Girder are available from your customary steel fabricators. Fabrication, construction, and assembly shall be in conformance with the Girder-Slab® System Design Guide v3.2 specifications and details.

G IRD E R- SL AB ® D E SI GN GUIDE v 3 .2


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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The application and use of the Girder-Slab速 System technology requires design by your registered professional engineer or architect. This Design Guide provides engineering information and is available for use by industry professionals. Girder-Slab Technologies, LLC is a marketing company. We inform design and construction professionals, supply design tools and details, and assist the engineer of record on an as needed basis. Girder-Slab Technologies can help you determine whether or not the Girder-Slab速 System will add value to your project.

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G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2


09 Gypsum Wall Board Ceiling

11 UL K912

10 Eliminate Beam Penetrations

12 Various Architectural Designs

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