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Mid to high-rise residential structures have traditionally used a cast-in-place reinforced concrete structural system which offers such benefi ts as low fl oor to fl oor height and fi reproof construction. With similar benefi ts, 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 effi cient 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 fl ange section that when uniquely cut through the web produces two equal but opposite T sections.

The fabricator then welds a fl at bar to create the top fl ange resulting in two D-Beams from one parent beam without waste.

GIRDER-SLAB®DESIGN GUIDE V3.1 4

Neutral Axis

SlabGroutSteel

GIRDER-SLAB®DESIGN GUIDE V3.1 6

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

Sample Calculations8” D-Beam DB 8 x 61 with 8” Hollow-CoreLRFD

9” D-Beam DB 9 x 65 with 10” Hollow-CoreLRFD

GIRDER-SLAB®DESIGN GUIDE V3.1 10

GIRDER-SLAB®DESIGN GUIDE V3.1 12

GIRDER-SLAB®DESIGN GUIDE V3.1 14

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

Certifi cations Directory for modifi cations or updates.

GIRDER-SLAB®DESIGN GUIDE V3.1 18

GIRDER-SLAB®DESIGN GUIDE V3.1 20

09 Gypsum Wall Board Ceiling 10 Eliminate Beam Penetrations

11 UL K912 12 Various Architectural Designs

GIRDER SLAB COMPOSITE STEEL AND PRECAST SYSTEM

COMPOSITE STEEL AND PRECAST SYSTEM

®

GIRDER SLAB ®

REVERSE

POSITIVE

FONTS: ITC LUBALIN GRAPH DEMI & HELVETICA BOLD

COLORS: PMS 146 & BLACK