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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.
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.
GIRDER-SLAB®DESIGN GUIDE V3.1 2
The D-Beam® GirderWith 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.
GIRDER-SLAB®DESIGN GUIDE V3.1 4
8” D-Beam
Designation
WeB incluDeD Depth WeB parent Beamtop Bar
w x t Weightaverage
aread Thickness
tw sizea b
lb/ft in2 in in in in in x in
DB 8 x 37 36.7 10.8 8 3/8 W 12 x 53 2 5 3 x 1
DB 8 x 39 39.2 11.5 8 3/8 W 12 x 58 13/4 51/4 3 x 1
DB 8 x 42 41.8 12.3 8 3/8 W 12 x 53 1 51/2 3 x 11/2
DB 8 x 45 44.3 13.0 8 3/8 W 12 x 58 3/4 53/4 3 x 11/2
DB 8 x 57 56.5 16.6 8 1/2 W 12 x 79 15/8 53/8 5 x 1
DB 8 x 61 60.8 17.9 8 1/2 W 12 x 79 11/8 55/8 5 x 11/4
9” D-Beam
Designation
WeB incluDeD Depth WeB parent Beamtop Bar
w x t Weightaverage
aread Thickness
tw sizea b
lb/ft in2 in in in in in x in
DB 9 x 41 40.7 12.0 95/8 3/8 W 14 x 61 33/8 51/4 3 x 1
DB 9 x 45 44.2 13.0 93/4 7/16 W 14 x 68 31/2 51/4 3 x 1
DB 9 x 46 45.8 13.5 95/8 3/8 W 14 x 61 23/8 53/4 3 x 11/2
DB 9 x 48 47.2 13.9 913/16 7/16 W 14 x 74 31/2 55/16 3 x 1
DB 9 x 49 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 5 x 1
DB 9 x 65 65.0 19.1 93/4 1/2 W 12 x 79 41/8 41/8 5 x 11/2
GIRDER-SLAB®DESIGN GUIDE V3.1 8
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.
GIRDER-SLAB®DESIGN GUIDE V3.1 16
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.
GIRDER-SLAB®DESIGN GUIDE V3.1 18
09 Gypsum Wall Board Ceiling 10 Eliminate Beam Penetrations
11 UL K912 12 Various Architectural Designs