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DESCRIPTION
Designed, fabricated and built by you, the Girder-Slab® System, in combination with a structural steel frame, offers a complete steel and concrete superstructure that provides low floor to floor heights and speed of construction. The application and use of the Girder-Slab® System technology requires design by your registered professional engineer or architect. This Design Guide provides all required engineering information and is available for use by industry professionals. All materials are procured from local steel fabricators and precast suppliers through a conventional bidding process.
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v3.2
07
G I R D E R - S L A B ® S Y S T E M / D E S I G N G U I D E v 3 . 2
v3.2
GIRDER-SLAB®DESIGN GUIDE v3.2
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.
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.
An innovative design with a conventional approach.
2GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE v3.2
The D-Beam® Girder
4GIRDER-SLAB®DESIGN GUIDE V3.2
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-SLAB®DESIGN GUIDE v3.2
Neutral Axis
SlabGroutSteel
6GIRDER-SLAB®DESIGN GUIDE V3.2
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.
The Girder-Slab® System integrates easily with lateral resisting steel braced frames, and concrete or masonry shear walls.
GIRDER-SLAB®DESIGN GUIDE v3.2
8GIRDER-SLAB®DESIGN GUIDE V3.2
DB8 indicates 8” D-Beam® Girder Section
indicates 8” Precast Hollow-Core Slab
DB8
DB8
DB8
DB8
DB8
DB8
DB
8
W18
W12
W18
DB8
DB8
DB8
DB8
DB8
DB8
W18
W21
W18
DB8
W10
W10
DB8
W10
W10
W10
W10
W10
W10
W10
W10
W10
W10
W10
W10
W10
W10
W12
W12
W12
W18
W10
W10
W10
W10
W10
W10
W10
W10
W12
W12
W18
W12
HSS
HSS
HSS
STAIR
STAIR
ELEV.
ELEV.
ELEV.
W21 W
21
W18
W18
BF
BF
BF
BF
BF
BF
BF
Framing Plan Example
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
Designation
Web Included Weight
(lb/ft)
AverageArea
(in2)
Depth
(d)
(in)
Parent Beam Size
Web Thickness
(tw)
(in)
Flange Thickness
(tf)
(in)
Flange Width
(bf)
(in)
a
(in)
b
(in)
w
(in)
t
(in)
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
D-Beam®
Dimensions
GIRDER-SLAB®DESIGN GUIDE v3.2
ASD9TH
Edition
ASD14TH
Edition
LRFD14TH
Edition
Fy = 50 ksi
Designation Ix
(in4)
NAbot DB
(in)
Sbot
(in3)
Stop
(in3)
Qtop bar
(in3)
PNAbot DB
(in)
Z
(in3)
Mallow
(kip-ft)
Mn/Ωb
(kip-ft)
φbMn
(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
D-Beam®
Properties
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Sample Calculations8” D-Beam DB 8 x 61 with 8” Hollow-CoreLRFD
GIRDER-SLAB®DESIGN GUIDE v3.2
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.
9” D-Beam DB 9 x 65 with 10” Hollow-CoreLRFD
12GIRDER-SLAB®DESIGN GUIDE V3.2
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-SLAB®DESIGN GUIDE v3.2
14GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE v3.2
16GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE v3.2
DB8D-BEAM®
PRECAST CONCRETESLAB
GROUT
METAL STUD PARTITIONGYPSUM BOARD &OPTIONAL
8”
(1) LAYER GYPSUM BOARD (REFER TO U.L. K912)
METAL STUD PARTITIONGYPSUM BOARD &OPTIONAL
OPTIONALCROWNMOLDING
8” GROUT
SPRAYFIREPROOFING(REFER TO U.L. K912)
PRECAST CONCRETESLAB
DB8D-BEAM®
DB8D-BEAM®
PRECAST CONCRETESLAB
GROUT8”
PIPING &MECHANICALCHASE
11 1/4”
MIN.
PRECAST CONCRETESLAB
DB8D-BEAM®
GROUT8”
STRUCTURAL,PIPING, &MECHANICALCHASE
11 1/4”MIN.
18GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE 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.
SPECIFYING THE GIRDER-SLAB® SYSTEM TECHNOLOGY v3.2
Fire Resistance InformationFire Resistance Rating — ANSI/UL 263Design No. K912April 19, 2001Restrained 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.
20GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE v3.2
The application and use of the Girder-Slab® 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® System will add value to your project.
GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE v3.2
11 UL K912
GIRDER-SLAB®DESIGN GUIDE V3.2
10 Eliminate Beam Penetrations09 Gypsum Wall Board Ceiling
12 Various Architectural Designs
GIRDER-SLAB®DESIGN GUIDE v3.2
GIRDER-SLAB®DESIGN GUIDE V3.2
GIRDER-SLAB®DESIGN GUIDE v3.227
GIRDER-SLAB®DESIGN GUIDE V3.2 28
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GIRDER-SLAB®DESIGN GUIDE V3.2 30
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