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.
GIRDER-SLA B速 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
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.
G IRD E R- SL AB 速 D E SI GN GUIDE v 3 .2
GIRDER-SLA B速 DES I GN GU I DE V 3 .2
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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