07
19
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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.
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.
GIRDER-SLA B® DES I GN GU I DE V 3 .1
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The D-Beam® 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 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-SLA B® DES I GN GU I DE V 3 .1
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Neutral Axis Slab Grout Steel
GIRDER-SLA B速 DES I GN GU I DE V 3 .1
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WEB INCLUDED
DEPTH
WEB
WEIGHT
AVERAGE AREA
d
THICKNESS tw
lb/ft
in2
in
in
DB 8 x 37
36.7
10.8
8
3/8
DB 8 x 39
39.2
11.5
8
DB 8 x 42
41.8
12.3
DB 8 x 45
44.3
DB 8 x 57 DB 8 x 61
PARENT BEAM a
b
TOP BAR wxt
in
in
in x in
W 12 x 53
2
5
3x1
3/8
W 12 x 58
13/4
51/4
3x1
8
3/8
W 12 x 53
1
51/2
3 x 11/2
13.0
8
3/8
W 12 x 58
3/4
53/4
3 x 11/2
56.5
16.6
8
1/2
W 12 x 79
15/8
53/8
5x1
60.8
17.9
8
1/2
W 12 x 79
1
5
DEPTH
WEB
WEIGHT
AVERAGE AREA
d
THICKNESS tw
lb/ft
in2
in
in
DB 9 x 41
40.7
12.0
95/8
3/8
DB 9 x 45
44.2
13.0
9
DB 9 x 46
45.8
13.5
DB 9 x 48
47.2
DB 9 x 49
8” D-BEAM DESIGNATION
WEB INCLUDED
SIZE
1/8
5/8
PARENT BEAM
5 x 11/4
a
b
TOP BAR wxt
in
in
in x in
W 14 x 61
33/8
51/4
3x1
7/16
W 14 x 68
3
5
3x1
95/8
3/8
W 14 x 61
23/8
53/4
3 x 11/2
13.9
913/16
7/16
W 14 x 74
31/2
55/16
3x1
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
5x1
DB 9 x 65
65.0
19.1
93/4
1/2
W 12 x 79
41/8
41/8
5 x 11/2
9” D-BEAM DESIGNATION
3/4
SIZE
1/2
1/4
GIRDER-SLA B® DES I GN GU I DE V 3 .1
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Sample Calculations LRFD
8” D-Beam DB 8 x 61 with 8” Hollow-Core
LRFD 9” D-Beam DB 9 x 65 with 10” Hollow-Core
GIRDER-SLA B® DES I GN GU I DE V 3 .1
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GIRDER-SLA B速 DES I GN GU I DE V 3 .1
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GIRDER-SLA B速 DES I GN GU I DE V 3 .1
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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.
GIRDER-SLA B® DES I GN GU I DE V 3 .1
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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.
GIRDER-SLA B® DES I GN GU I DE V 3 .1
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GIRDER-SLA B速 DES I GN GU I DE V 3 .1
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09 Gypsum Wall Board Ceiling
11 UL K912
10 Eliminate Beam Penetrations
12 Various Architectural Designs
GIRDER SLAB
速
COMPOSITE STEEL AND PRECAST SYSTEM
REVERSE
GIRDER SLAB
速
COMPOSITE STEEL AND PRECAST SYSTEM
POSITIVE
FONTS: ITC LUBALIN GRAPH DEMI & HELVETICA BOLD
COLORS: PMS 146 & BLACK