GST Design Guide v3.1 LRFD ISSUU.pdf

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Mid to high-rise residential structures have traditionally used a cast-in-place reinforced concrete structural system which offers such bene ts as low oor to oor height and reproof construction. With similar bene 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 ef 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 owners architect and structural engineer and is available competitively from the builders 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 buildings superstructure.

An innovative design with a conventional approach.

GIRDER-SLABDESIGN 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 ange section that when uniquely cut through the web produces two equal but opposite T sections.

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


Neutral Axis

SlabGroutSteel


8 D-BEAMDESIGNATION

WEB INCLUDED DEPTH WEB PARENT BEAMTOP BARw x t WEIGHT AVERAGEAREA d

THICKNESStw SIZE

a 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-BEAMDESIGNATION

WEB INCLUDED DEPTH WEB PARENT BEAMTOP BARw x t WEIGHT AVERAGEAREA d

THICKNESStw SIZE

a 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


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

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


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)


DB8D-BEAM

DB8D-BEAM


GROUT8

PIPING &MECHANICALCHASE

11 1/4

MIN.


DB8D-BEAM

GROUT8

STRUCTURAL,PIPING, &MECHANICALCHASE

11 1/4MIN.


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

Certi cations Directory for modi cations or updates.


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

GST Design Guide v3.1 LRFD ISSUU.pdf

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