Attachment_E_Steel_Bar_Grating.pdf

Steel Bar Grating

4 GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacifi c.com

Type “SL” Swage Locked Steel Grating Type “SL” steel gratings are manufactured by inserting hollow tube cross bars into pre-punched holes in the bearing bars. The cross bars are then swaged forming a positive mechanical connection. The cross bars are recessed below the top surface of the bearing bars providing a uniform and attractive architectural appearance.

Swage locking is a particularly effi cient process for the production of close mesh gratings. Type 7-SL-4 with 3/16" thick bearing bars provides a net 1/4" clear opening between the bearing bars. This narrow opening is often preferred in public areas where concerns of drainage and the presence of high heeled shoes converge.

Type “DT” Dovetail Pressure Locked Steel Grating Type “DT” steel gratings have deep rectangular cross bars and are manufactured by inserting pre-punched bearing bars and cross bars into an “egg-crate” confi guration and deforming the cross bars under intense hydraulic pressure.

The deep cross bars on type “DT” gratings make them popular for architectural applications such as sun shades and infi ll panels with the deeper cross bar serving as a distinct architectural accent.

Type 19-W-4

DOVETAIL

INTERSECTION

Type 11-W-4

SWAGED

INTERSECTION

WELDED STEEL

INTERSECTION

Steel Bar Grating Steel bar grating is manufactured from ASTM A-1011 mild carbon steel and is available in three distinct products: type “W” welded bar grating, type “DT” dovetail pressure locked grating, and type “SL” swage locked grating. All three products are available with bearing bar spacing ranging from 19/16" (1-3/16") to 7/16" on center and with cross bars at either 4" or 2" on center.

Each product has a standard plain surface or may be specifi ed with optional serrated or Algrip surfaces.

Finish options include bare steel, painted, hot dip galvanized, or specialty coatings.

The load tables on pages 6-10 provide detailed specifi cation information related to these products.

Type “W” Welded Steel Grating Our most economical steel grating products, type “W” welded steel gratings are manufactured by forge welding rectangular bearing bars and drawn cross bars.

This welding process provides a positive fused connection providing years of service under the most demanding conditions.

Type 19-W-4 steel grating is our most popular product and is recommended for nearly all industrial fl ooring applications. With nearly 80% open area, 19-W-4 allows for the easy passage of dirt, debris, snow, and liquids and is essentially self-cleaning.

Type “W” gratings are available in close mesh, ADA conforming spacings 11-W-4 and 7-W-4 which are commonly used in public areas.

When specifying type 11-W-4 for ADA applications, 3/16" thick bearing bars must be specifi ed.

Type 11-W-4

Steel bar grating is manufactured from ASTM A-1011 mild carbon steel and is available in three distinct products: type swage locked grating. All three products are available with bearing bar spacing ranging from 19/16" (1-3/16") to 7/16" on center and with cross

Each product has a standard plain surface or may be specifi ed with optional serrated or Algrip surfaces.

welded steel gratings are manufactured by forge welding rectangular bearing bars and drawn cross bars.

This welding process provides a positive fused connection providing years of

PEDESTRIAN RATED GRATING

CONSTRUCTION TO BE PROVIDED

GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacifi c.com

Steel Grating Table of Spacings Part No. Spacing Open Area*

19-W-4 Bearing bars spaced at 1-3/16" on center and cross bars at 4" on center. The workhorse of industrial fl ooring, popular for platforms, catwalks, mezzanines, and stairways.

19-DT-4 78%

19-SL-4

19-W-2 Bearing bars spaced at 1-3/16" on center and cross bars at 2" on center. Excellent for short spans and applications where small wheeled carts continuously cross the grating surface.

19-DT-2 73%

19-SL-2

15-W-4 Bearing bars spaced at 15/16" on center and cross bars at 4" on center. The closer spaced bearing bars increase load capacity by more than 26% when compared to similar gratings produced with bearing bars at 1-3/16" on center.

15-DT-4 75%

15-SL-4

15-W-2 Bearing bars spaced at 15/16" on center and cross bars at 2" on center. The closer spaced bearing bars and cross bars provide additional fl ooring surface to support pedestrian and wheeled traffi c.

15-DT-2 69%

15-SL-2

11-W-4

Bearing bars spaced at 11/16" on center and cross bars at either 4" or 2" on center. Types 11-4 and 11-2 with 3/16" thick bearing bars comply with the spacing requirements of the Americans with Disabilities Act. For ADA installations, specify that the bearing bars span perpendicular to the normal fl ow of traffi c.

11-DT-4 68%

11-SL-4

11-W-2

11-DT-2 63%

11-SL-2

8-W-4

8-DT-4

8-SL-4 Bearing bars spaced at 1/2" on center and cross bars at 4" or 2" on center. Types 8-4 and 8-2 comply with ADA spacing requirements.

These products are popular for material handling platforms and mezzanines subject to continuous cart and dolly traffi c.

58%

8-W-2

8-DT-2

8-SL-2

54%

7-W-4 Bearing bars spaced at 7/16" on center and cross bars at 4" or 2" on center. Types 7-4 and 7-2 comply with ADA spacing requirements and are popular for applications in the public way. When specifi ed with 3/16” thick bearing bars, 7-4 and 7-2 gratings have a net 1/4" clear opening between the bearing bars and commonly reject intrusion by high heeled shoes.

7-DT-4 53%

7-SL-4

7-W-2

7-DT-2 49%

7-SL-2

* Percentage of open area is based upon 3/16" thick bearing bars and .275" cross bars. Contact Grating Pacifi c if exact open area calculation is required for alternative bearing bar thicknesses or cross bar sizes.

How to Specify Steel Bar Grating

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1-3/16"

15/16"

11/16"

1/2"

7/16" 7/16"

1/2"

11/16"

15/16"

1-3/16"

4"

4"

4"

4"

4"

2" 2"

2" 2"

2" 2"

2" 2"

2" 2"

1. Select type of grating

• “W” for welded steel grating

• “DT” for dovetail pressure locked grating

• “SL” for swage locked grating

2. Select bar spacing from table above

3. Select bearing bar size (consult load tables on pages 6-10 considering service loads and clear spans)

4. Specify plain, serrated, or Algrip surface

5. Specify banding or additional trim required

6. Specify fi nish

• Bare steel (no fi nish)

• Painted (red, black, silver, other)

• Hot dip galvanized (per ASTM A-123)

• Other

7. Specify fasteners (if required) – see page 59

CONSTRUCTION TO BE PROVIDED

6 GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacific.com

Bearing Bar Size (inches)

Approx.

Weight psf *

Max.

Ped.

Span**

Sec. Prop.*** Sx in3

Ix in4

Unsupported Span

2'-0 2'-6 3'-0 3'-6 4'-0 4'-6 5'-0 5'-6 6'-0 6'-6 7'-0 8'-0 9'-0

3/4 x 1/8 3.9 3'-5" 0.118 0.044

U 355 227 158 116 89 70 All loads and deflections are theoretical and based upon the gross sections of the bearing bars, using a fiber stress of 18,000 psi.

The values are not intended to be absolute since the actual load capacity will be affected by the slight variations in mill and manufacturing tolerances.

Grating for spans to the left of the heavy line have a deflection ≤ 1/4" for uniform loads of 100 psf.

D 0.099 0.155 0.223 0.304 0.397 0.503 C 355 284 237 203 178 158 D 0.079 0.124 0.179 0.243 0.318 0.402

3/4 x 3/16 5.6 3'-10" 0.178 0.067

U 533 341 237 174 133 105 85 D 0.099 0.155 0.223 0.304 0.397 0.503 0.621 C 533 426 355 305 266 237 213 D 0.079 0.124 0.179 0.243 0.318 0.402 0.497

1 x 1/8 5.0 4'-3" 0.211 0.105

U 632 404 281 206 158 125 101 84 U = uniform load in pounds/sq. ft.

C = concentrated load in pounds/ft. of grating width D = deflection in inches

D 0.074 0.116 0.168 0.228 0.298 0.377 0.466 0.563 C 632 505 421 361 316 281 253 230 D 0.060 0.093 0.134 0.182 0.238 0.302 0.372 0.451

1 x 3/16 7.2 4'-9" 0.316 0.158

U 947 606 421 309 237 187 152 125 105 D 0.074 0.116 0.168 0.228 0.298 0.377 0.466 0.563 0.670 C 947 758 632 541 474 421 379 345 316 D 0.060 0.093 0.134 0.182 0.238 0.302 0.372 0.451 0.536

1-1/4 x 1/8 6.1 5'-1" 0.329 0.206

U 987 632 439 322 247 195 158 131 110 93 D 0.060 0.093 0.134 0.182 0.238 0.302 0.372 0.451 0.536 0.629 C 987 790 658 564 493 439 395 359 329 304 D 0.048 0.074 0.107 0.146 0.191 0.241 0.298 0.360 0.429 0.504

1-1/4 x 3/16 8.9 5'-7" 0.493 0.308

U 1,480 947 658 483 370 292 237 196 165 140 121 D 0.060 0.093 0.134 0.238 0.302 0.372 0.451 0.536 0.629 0.730 C 1,480 1,184 987 846 740 658 592 538 493 456 423 D 0.048 0.074 0.107 0.146 0.191 0.241 0.298 0.360 0.429 0.504 0.584

1-1/2 x 1/8 7.2 5'-10" 0.474 0.355

U 1,421 910 632 464 355 281 227 188 158 135 116 D 0.050 0.078 0.112 0.152 0.199 0.251 0.310 0.376 0.447 0.524 0.608 C 1,421 1,137 947 812 711 632 568 517 474 437 406 D 0.040 0.062 0.089 0.122 0.159 0.201 0.248 0.300 0.358 0.420 0.487

1-1/2 x 3/16 10.7 6'-5" 0.711 0.533

U 2,132 1,364 947 696 533 421 341 282 237 202 174 133 D 0.050 0.078 0.112 0.152 0.199 0.251 0.310 0.376 0.447 0.524 0.608 0.794 C 2,132 1,705 1,421 1,218 1,066 947 853 775 711 656 609 533 D 0.040 0.062 0.089 0.122 0.159 0.201 0.248 0.300 0.358 0.420 0.487 0.636

0.564

215 183 158 121 96

0.383 0.450 0.521 0.681 0.862

860 774 703 645 595 553 484 430 D 0.034 0.053 0.077 0.104 0.136 0.172 0.213 0.257 0.306 0.360 0.417 0.545 0.689

1-3/4 x 3/16 12.3 7'-3" 0.967 0.846

U 2,901 1,857 1,290 947 725 573 464 384 322 275 237 181 143 D 0.043 0.067 0.096 0.130 0.170 0.215 0.266 0.322 0.383 0.450 0.521 0.681 0.862 C 2,901 2,321 1,934 1,658 1,451 1,290 1,161 1,055 967 893 829 725 645 D 0.034 0.053 0.077 0.104 0.136 0.172 0.213 0.257 0.306 0.360 0.417 0.545 0.689

2 x 1/8 9.6 7'-4" 0.842 0.842

U 2,526 1,617 1,123 825 632 499 404 334 281 239 206 158 125 D 0.037 0.058 0.084 0.114 0.149 0.189 0.233 0.282 0.335 0.393 0.456 0.596 0.754 C 2,526 2,021 1,684 1,444 1,263 1,123 1,011 919 842 777 722 632 561 D 0.030 0.047 0.067 0.091 0.119 0.151 0.186 0.225 0.268 0.315 0.365 0.477 0.603

2 x 3/16 13.9 8'-0" 1.263 1.263

U 3,790 2,425 1,684 1,237 947 749 606 501 421 359 309 237 187 D 0.037 0.058 0.084 0.114 0.149 0.189 0.233 0.282 0.335 0.393 0.456 0.596 0.754 C 3,790 3,032 2,526 2,165 1,895 1,684 1,516 1,378 1,263 1,166 1,083 947 842 D 0.030 0.047 0.067 0.091 0.119 0.151 0.186 0.225 0.268 0.315 0.365 0.477 0.603

2-1/4 x 3/16 15.6 8'-9" 1.599 1.799

U 4,796 3,070 2,132 1,566 1,199 947 767 634 533 454 392 300 237 D 0.033 0.052 0.074 0.101 0.132 0.168 0.207 0.250 0.298 0.350 0.406 0.530 0.670 C 4,796 3,837 3,197 2,741 2,398 2,132 1,918 1,744 1,599 1,476 1,370 1,199 1,066 D 0.026 0.041 0.060 0.081 0.106 0.134 0.166 0.200 0.238 0.280 0.324 0.424 0.536

2-1/2 x 3/16 17.2 9'-5" 1.974 2.467

U 5,921 3,790 2,632 1,933 1,480 1,170 947 783 658 561 483 370 292 D 0.030 0.047 0.067 0.091 0.119 0.151 0.186 0.225 0.268 0.315 0.365 0.477 0.603 C 5,921 4,737 3,947 3,384 2,961 2,632 2,368 2,153 1,974 1,822 1,692 1,480 1,316 D 0.024 0.037 0.054 0.073 0.095 0.121 0.149 0.180 0.215 0.252 0.292 0.381 0.483

Use this table when evaluating spans and loads for the following types of steel grating:

19-W-4, 19-W-2, 19-DT-4, 19-DT-2, 19-SL-4, & 19-SL-2

Number of Bearing Bars 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Panel Width 1-3/8" 2-9/16" 3-3/4" 4-15/16" 6-1/8" 7-5/16" 8-1/2" 9-11/16" 10-7/8" 12-1/16" 13-1/4" 14-7/16" 15-5/8" 16-13/16" 18"

Number of Bearing Bars 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Panel Width 19-3/16" 20-3/8" 21-9/16" 22-3/4" 23-15/16" 25-1/8" 26-5/16" 27-1/2" 28-11/16" 29-7/8" 31-1/16" 32-1/4" 33-7/16" 34-5/8" 35-13/16"

Number of Bearing Bars 32 33 34 35 36 37 38 39 40 41

Panel Width 37" 38-3/16" 39-3/8" 40-9/16" 41-3/4" 42-15/16" 44-1/8" 45-5/16" 46-1/2" 47-11/16"

19 Space (1-3/16") Load Table

Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values.

Indicates stock panel widths.

* Weight per square foot based upon 19-W-4 grating. Add .60 psf for 2" on center cross bars. ** Maximum pedestrian load is defined as a 100# uniform load with deflection ≤ 1/4 inch. (The 1/4" maximum deflection criteria is considered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.) *** Section properties per foot of width.

Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.

Panel Widths Grating panels are available from stock in nominal 24", 36" and 48" widths. When considering alternative widths, consult this table to select widths that will maintain uniform “out-to-out” spacing of the bearing bars.

Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will vary from the spacing throughout the remainder of the panel.

PEDESTRIAN GRATING BEARING BAR SIZE TO BE PORVIDED

36 GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacifi c.com

Heavy Duty Grating

Welded Heavy Duty Gratings are designed to service applications subject to heavy rolling and static loads such as highways, plant fl oors, loading docks, inlet covers, and airports. Since conditions can range from smaller forklift to large truck or aircraft traffi c, heavy duty gratings are manufactured in a wide range of bar sizes and spacings.

Design Criteria Vehicular loads are designed in conformance with current AASHTO spec-ifi cations for classifi cations H-15 through H-25. Automobile and forklift loads are similarly evaluated with loads calculated and distributed in accordance with the “Maximum Traffi c Conditions” presented on page 37.

If your application is not adequately addressed by these load conditions, please contact our Engineering Department and we will gladly assist in the selection of an appropriate heavy duty grating for your specifi c need.

Table of Spacings

15-W-4 Bearing Bars at 15/16" O.C.

Cross Bars at 4" O.C. 15-W-2 Bearing Bars at 15/16" O.C.

Cross Bars at 2" O.C.

19-W-4 Bearing Bars at 1-3/16" O.C.

Cross Bars at 4" O.C.

22-W-4 Bearing Bars at 1-3/8" O.C.

Cross Bars at 4" O.C. 22-W-2 Bearing Bars at 1-3/8" O.C.

Cross Bars at 2" O.C.

30-W-4 Bearing Bars at 1-7/8" O.C.

Cross Bars at 4" O.C. 30-W-2 Bearing Bars at 1-7/8" O.C.

Cross Bars at 2" O.C.

38-W-4 Bearing Bars at 2-3/8" O.C.

Cross Bars at 4" O.C. 38-W-2 Bearing Bars at 2-3/8" O.C.

Cross Bars at 2" O.C.

1- 3/16"

4"

4"

1- 3/16"

2" 2"

15/16"

1- 3/8"

4"

1- 3/8"

2" 2"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

Materials & Spacings Heavy duty gratings are manufactured in carbon steel and 300 series stainless steels. Carbon steel products are available bare (no fi nish), paint-ed with manufacturers standard paint, or hot dip galvanized.

Stainless steel products are available mill fi nish, commercially cleaned, or electro-polished.

Below you will fi nd a table of spacings for our most popular products.

1- 3/16"

4"

4"

1- 3/16"

2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 3/8"

2" 2"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4"

4"

1- 3/16"

2" 2"

2" 2"

15/16" 15/16"

4"

1- 3/8"

2" 2"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4"

4"

1- 3/16"

2" 2"

2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 3/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4"

4"

2" 2"

15/16"

1- 3/8"

4"

1- 3/8"

2" 2"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4" 2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 3/8"

2" 2"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4"

4"

1- 3/16"

2" 2"

2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4"

4"

1- 3/16"

2" 2"

2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 7/8"

4" 2" 2"

2- 3/8"

4"

2- 3/8"

2" 2"

1- 3/16"

4"

4"

1- 3/16"

2" 2"

2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 7/8"

4"

1- 7/8"

2" 2"

2- 3/8"

4" 2" 2"

1- 3/16"

4"

4"

1- 3/16"

2" 2"

2" 2"

15/16" 15/16"

1- 3/8"

4"

1- 3/8"

1- 7/8"

4"

1- 7/8"

2" 2"

4"

2- 3/8"

2" 2"

Materials & Spacings

Standard Cross Bars

Optional Rectangular Cross Bars

15/16"15/16"

1-3/8"

1-7/8"

2-3/8" 2-3/8"

1-7/8"

1- 3/8"

2" 2"

GRATING SPACING TO BE PROVIDED

37GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacifi c.com

Bearing Bar Selection Once the bar spacing is selected, the bearing bar size must be specifi ed based upon the load and unsupported clear span to be served. The tables on pages 38-42 provide the maximum clear span for our most popular products based on the traffi c conditions defi ned on this page. These tables incorporate strict limitations where design defl ection shall not exceed the lesser of L/400 or .125" for the spans indicated.

Cross Bar Selection While bearing bar selection is critical for specifying a proper heavy duty grating, the life cycle of your installation will often be infl uenced by the selection of the appropriate cross bar. The table below details the variety of cross bar sizes available.

The cross bars listed for Standard Loads are the customary twisted square or round cross bars supplied by Grating Pacifi c for a particular bearing bar size and spacing. These sizes have been selected to maximize manufacturing effi ciency and are best used when the grating is subject to intermittent traffi c with occasional full capacity loading.

The cross bars listed for Severe Loads are optional and will provide superior durability when gratings are subject to intense, continuous, or repetitious traffi c. Ideal for trench covers, highways, and inlet grates, these cross bars enhance lateral stiffness thereby extending the service life of the grating. When specifying gratings with bearing bars centered at 1-3/8", 1-7/8", or 2-3/8" on center, consideration of Severe Loading cross bars is highly recommended.

Note: In the event that a cross bar size is not specifi ed, the cross bar shall be selected at the discretion of the manufacturer.

Maximum Traffi c Conditions

Wheel Load (lbs)

(1/2 axle load + 30% impact)

Load Distribution

Parallel with Axle

Perpendicular to Axle

Truck Traffi c 40,000 lb. Axle Load Dual Wheels Modifi ed AASHTO H-25

26,000 2 (C)*+ 25" 25"

Truck Traffi c 32,000 lb. Axle Load Dual Wheels Modifi ed AASHTO H-20

20,800 2 (C)*+ 20" 20"

Truck Traffi c 24,000 lb. Axle Load Dual Wheels Modifi ed AASHTO H-15

15,600 2 (C)*+ 15" 15"

Automobile Traffi c 6,322 lb. Vehicle 3,578 lb. Load 60% Drive Axle Load

3,861 2 (C)*+ 9" 9"

24,400 lb. Total Load 85% Drive Axle Load

(C)*+11" 11"

6,000 lb. Cap. Lift Truck 9,800 lb. Vehicle 15,800 lb. Total Load 85% Drive Axle Load

8,730 2 (C)*+7" 7"

2,000 lb. Cap. Lift Truck 4,200 lb. Vehicle 6,200 lb. Total Load 85% Drive Axle Load

3,425 2 (C)*+4" 4"

Heavy Duty Grating Cross Bars

Bearing Bar Size BB Centers 15/16", 1-3/16", & 1-3/8" BB Centers 1-7/8" & 2-3/8"

Thickness Depth Standard Loads Severe Loads Standard Loads Severe Loads 1/4" 1" - 2-1/2" 5/16" Twisted 5/16" Twisted 5/16" Twisted 5/16" Twisted

5/16" 1" - 2-1/2" 5/16" Twisted 5/16" Twisted 5/16" Twisted 5/16" Twisted 3/8" 1" - 2-1/2" 5/16" Twisted 5/16" Twisted 5/16" Twisted 5/16" Twisted 1/4" 3" - 5" 5/16" Twisted 1" x 1/4" 3/8" Round 1" x 1/4"

5/16" - 1/2" 3" - 5" 3/8" Round 1" x 3/8" 7/16" Round 1" x 3/8" 1/4" 5-1/2" - 7" 3/8" Round 1-1/4" x 1/4" 7/16" Round 1-1/4" x 1/4"

5/16" - 1/2" 5-1/2" - 7" 3/8" Round 1-1/4" x 3/8" 7/16" Round 1-1/4" x 3/8"

The sizes shown above are listed as minimums. Twisted and round cross bars are typically interchangeable and, unless otherwise specifi ed, may be substituted at the discretion of the manufacturer. In substitution, the cross sectional area of the alternative cross bar shall equal or exceed the minimum size listed above.

1 Ton Forklift

3 Ton Forklift

Automobile

H-15

H-20

H-25

*C = Center-to-center spacing of bearing bars. Allowable stress – 20,000 psi Modulus of elasticity – 29,000,000 psi

How to Specify Heavy Duty Bar Grating

1. Select type of grating

• “W” for welded steel grating

• “WS” for welded stainless steel grating

2. Select bar spacing from table on page 36

3. Select bearing bar size from tables on pages 38-42

4. Specify cross bar size from selection table above

5. Specify plain or serrated surface

6. Specify banding and any additional trim required

7. Specify fi nish

• Bare steel (no fi nish)

• Painted (red, black, silver, other)

• Hot dip galvanized (per ASTM A-123)

• Other

8. Specify fasteners (if required) – see page 59

Banding Heavy duty gratings are commonly subjected to shock and impact loads and it is highly recommended that all open ends be banded. The welded band bar helps distribute impact loads and minimizes distortion when subjected to repetitive traffi c patterns. Banding details can be found on page 58.

Serrated Surface Optional serrated bearing bars enhance skid-resistance. Consider this surface for applications subject to the accumu-lation of liquids or lubricants or inclined installations.

GRATING IS RATED FOR AUTO TRAFFIC

39GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacific.com

Use this table when evaluating spans & loads for the following types of Heavy Duty steel grating:

19-W-4 and 19-W-2 19 Space

(1-3/16") Load Table

Maximum Safe Span

Bearing Bar Size (inches)

Section Modulus per foot of width

Moment of Inertia perfoot of width

Approx.

Weight psf

H-25 Load

H-20 Load

H-15 Load

Auto Traffic

5 Ton Forklift

3 Ton Forklift

1 Ton Forklift

1 x 1/4 0.421 0.211 9.7 1'-0" 0'-10" 0'-9" 1'-0" 0'-7" 0'-6" 0'-7"

1 x 5/16 0.526 0.263 11.9 1'-1" 1'-0" 0'-10" 1'-2" 0'-8" 0'-7" 0'-8"

1 x 3/8 0.632 0.316 14.0 1'-2" 1'-1" 0'-11" 1'-4" 0'-9" 0'-8" 0'-9"

1-1/4 x 1/4 0.658 0.411 11.9 1'-3" 1'-1" 1'-0" 1'-5" 0'-9" 0'-8" 0'-10"

1-1/4 x 5/16 0.822 0.514 14.5 1'-4" 1'-3" 1'-1" 1'-8" 0'-10" 0'-9" 1'-0"

1-1/4 x 3/8 0.987 0.617 17.2 1'-6" 1'-4" 1'-2" 1'-11" 1'-0" 0'-10" 1'-2"

1-1/2 x 1/4 0.947 0.711 14.0 1'-6" 1'-4" 1'-2" 1'-11" 0'-11" 0'-10" 1'-1"

1-1/2 x 5/16 1.184 0.888 17.2 1'-8" 1'-6" 1'-4" 2'-3" 1'-1" 0'-11" 1'-4"

1-1/2 x 3/8 1.421 1.066 20.4 1'-10" 1'-8" 1'-6" 2'-6" 1'-2" 1'-1" 1'-7"

1-3/4 x 1/4 1.289 1.128 16.2 1'-9" 1'-7" 1'-5" 2'-5" 1'-2" 1'-0" 1'-5"

1-3/4 x 5/16 1.612 1.410 19.9 1'-11" 1'-9" 1'-7" 2'-11" 1'-4" 1'-3" 1'-9"

1-3/4 x 3/8 1.934 1.692 23.7 2'-2" 1'-11" 1'-9" 3'-2" 1'-6" 1'-5" 2'-1"

2 x 1/4 1.684 1.684 18.3 2'-0" 1'-10" 1'-8" 3'-1" 1'-4" 1'-3" 1'-10"

2 x 5/16 2.105 2.105 22.6 2'-3" 2'-1" 1'-11" 3'-6" 1'-7" 1'-6" 2'-4"

2 x 3/8 2.526 2.526 26.9 2'-6" 2'-4" 2'-2" 3'-10" 1'-10" 1'-9" 2'-9"

2-1/4 x 1/4 2.132 2.398 20.4 2'-3" 2'-1" 1'-11" 3'-9" 1'-7" 1'-6" 2'-4"

2-1/4 x 5/16 2.664 2.998 25.3 2'-7" 2'-5" 2'-3" 4'-2" 1'-11" 1'-10" 2'-11"

2-1/4 x 3/8 3.197 3.597 30.1 2'-10" 2'-8" 2'-7" 4'-5" 2'-2" 2'-2" 3'-5"

2-1/2 x 1/4 2.632 3.289 22.6 2'-6" 2'-4" 2'-3" 4'-4" 1'-10" 1'-10" 2'-10"

2-1/2 x 5/16 3.289 4.112 28.0 2'-11" 2'-9" 2'-7" 4'-8" 2'-3" 2'-3" 3'-6"

2-1/2 x 3/8 3.947 4.934 33.3 3'-4" 3'-2" 3'-0" 4'-11" 2'-7" 2'-7" 4'-2"

3 x 1/4 3.789 5.684 26.9 3'-3" 3'-1" 2'-11" 5'-2" 2'-6" 2'-6" 4'-1"

3 x 5/16 4.737 7.105 33.3 3'-9" 3'-7" 3'-6" 5'-7" 3'-0" 3'-1" 4'-9"

3 x 3/8 5.684 8.526 39.8 4'-4" 4'-2" 4'-1" 5'-11" 3'-7" 3'-8" 5'-1"

3-1/2 x 1/4 5.158 9.026 31.2 4'-0" 3'-10" 3'-9" 6'-0" 3'-3" 3'-4" 5'-2"

4'-0" 4'-1" 5'-7"

4'-8" 4'-10" 5'-11"

4 x 1/4 6.737 13.474 35.5 4'-11" 4'-10" 4'-9" 6'-11" 4'-2" 4'-3" 5'-11"

4 x 5/16 8.421 16.842 44.1 5'-5" 5'-5" 5'-5" 7'-5" 5'-1" 5'-3" 6'-4"

4 x 3/8 10.105 20.211 52.7 5'-8" 5'-8" 5'-9" 7'-11" 5'-6" 5'-8" 6'-9"

4-1/2 x 1/4 8.526 19.184 39.8 5'-7" 5'-7" 5'-8" 7'-9" 5'-1" 5'-4" 6'-8"

4-1/2 x 5/16 10.658 23.980 49.4 6'-0" 6'-0" 6'-1" 8'-4" 5'-10" 6'-0" 7'-2"

4-1/2 x 3/8 12.789 28.776 59.1 6'-5" 6'-5" 6'-5" 8'-11" 6'-2" 6'-4" 7'-7"

5 x 1/4 10.526 26.316 44.1 6'-3" 6'-3" 6'-3" 8'-8" 6'-0" 6'-2" 7'-5"

5 x 3/8 15.789 39.474 65.5 7'-1" 7'-1" 7'-2" 9'-11" 6'-11" 7'-1" 8'-6"

5 x 1/2 21.053 52.632 87.0 7'-10" 7'-10" 7'-11" 10'-11" 7'-7" 7'-9" 9'-4"

6 x 1/4 15.158 45.474 52.7 7'-5" 7'-5" 7'-6" 10'-4" 7'-3" 7'-5" 8'-11"

6 x 3/8 22.737 68.211 78.4 8'-6" 8'-6" 8'-7" 11'-10" 8'-3" 8'-6" 10'-2"

6 x 1/2 30.316 90.947 104.2 9'-4" 9'-4" 9'-5" 13'-1" 9'-1" 9'-4" 11'-2"

7 x 1/4 20.632 72.211 61.2 8'-8" 8'-8" 8'-9" 12'-1" 8'-5" 8'-8" 10'-4"

7 x 3/8 30.947 108.316 91.3 9'-11" 9'-11" 10'-0" 13'-10" 9'-8" 9'-11" 11'-10"

7 x 1/2 41.263 144.421 121.4 10'-10" 10'-11" 11'-0" 15'-3" 10'-7" 10'-11" 13'-1"

H-25 Load H-20 Load H-15 Load Auto Traffic 5 Ton Forklift 3 Ton Forklift 1 Ton Forklift

AUTO TRAFFIC GRATING BEARING BAR SIZE TO BE PORVIDED

58 GRATING PACIFIC Service. Quality. Reliability. Phoenix, AZ (888) 936-9201 | Los Alamitos, CA (800) 321-4314 Tracy, CA (800) 491-7999 | Woodburn, OR (800) 942-4041 | Kent, WA (800) 243-3939 www.gratingpacific.com

Banding & Panel Layout

Banding As manufactured, grating panels are provided with open ends. Optional trim banding, a metal flat bar welded to the open ends of the panel, provides additional transverse stiffness and a finished architectural appearance. Banding should be specified for all removable grating panels as the closed ends provide additional worker safety during handling.

Gratings subject to vehicular loads should always be specified as banded. In these ap-plications, the band bar helps reduce impact stresses by transferring loads to adjacent bearing bars and resists deformation caused by repetitive traffic patterns on open end gratings.

Load banding, where each bearing bar is welded to the band bar, helps distribute load throughout the grating panel.

Trench banding, where the band bar is elevated above the bottom of the bear-ing bars, is appropriate for drainage applications. The elevated band bar allows for efficient drainage and will not trap liquids between the band bar and the grating support.

See Banding Weld Standards for spe-cific welding practices.

Banding Weld Standards at each bearing bar t d

3/4"1/8"

3/4"3/16"

3/4"3/16"

Standard for trim unless noted

5"± O.C. for trim band (each bar for optional load banding)

5"± O.C. for trim band and trench grating

5"± O.C. for trim band (each bar for optional load banding)

* 1/2" for gratings deeper than 2-1/4"

* 1/4" for 3/4" thru 2-1/4" deep gratings

Panel Layout Stock grating panels are manufactured in nominal 24", 36", and 48" widths. These sizes allow for efficient layout and waste minimization when fabricated to your exact specification. Unlike competing grating products, individual grating panels do not require supports on all four sides of each cut piece. Bar grating panels only require support perpendicular to the bearing bar span. There is no need to place supports parallel to the bearing bars where adjacent panels are installed in succession. The following diagrams illustrate proper layout and support of a simple bar grating platform.

at each bearing bar t d

3/4"1/8"

3/4"3/16"

3/4"3/16"

Standard for trim unless noted

5"± O.C. for trim band (each bar for optional load banding)

5"± O.C. for trim band and trench grating

5"± O.C. for trim band (each bar for optional load banding)

* 1/2" for gratings deeper than 2-1/4"

* 1/4" for 3/4" thru 2-1/4" deep gratingsat each bearing bar t d

3/4"1/8"

3/4"3/16"

3/4"3/16"

Standard for trim unless noted

5"± O.C. for trim band (each bar for optional load banding)

5"± O.C. for trim band and trench grating

5"± O.C. for trim band (each bar for optional load banding)

* 1/2" for gratings deeper than 2-1/4"

* 1/4" for 3/4" thru 2-1/4" deep gratings at each bearing bar t d

3/4"1/8"

3/4"3/16"

3/4"3/16"

Standard for trim unless noted

5"± O.C. for trim band (each bar for optional load banding)

5"± O.C. for trim band and trench grating

5"± O.C. for trim band (each bar for optional load banding)

* 1/2" for gratings deeper than 2-1/4"

* 1/4" for 3/4" thru 2-1/4" deep gratings

Trench Banding

For grating with bearing bars less than 2-1/2" deep:

Standard Trim Banding

Load Banding (Optional)

8'-0"

4' -0

Sp an

Su pp or ts

35-13/16" 35-13/16"

3/16" 1/4"

23-15/16"

Mid-Support (if req’d)Support Support

Be ar in g

Ba r

Typical Panel Layouts

Trench Banding

Open Ends as Manufactured

Standard Trim Banding

For grating with bearing bars 2-1/2" and deeper:

8'-0"

4' -0

Sp an

Su pp or ts

35-13/16" 35-13/16"

3/16" 1/4"

23-15/16"

Be ar in g

Ba r

NOTE: Weld one side at top of bearing bar – opposite side at bottom, or weld one side only and exceed one-half the overall depth.

ALL GRATING TO BE PROVIDED WITH TRIM BANDING

GRATING TO BE PROVIDED IN

STANDARD 36" PIECES WITH ONE KEY

PIECE TO COMPLETE EACH RUN