Metal Bar Grating Specification Criteria – Grating Pacific EST. 1971

The load tables within this website provide load and deflection criteria for most common applications. These tables provide a concise reference to aid in the selection of the appropriate bearing bar size and spacing for the intended application.

You can find more information on our web, so please take a look.

Pedestrian loads are commonly analyzed with uniform and concentrated loads. For pedestrian comfort, deflection is typically limited to 1/4″.

Heavy duty and vehicular load tables are presented for specific load conditions with deflection limited to the lesser of 1/8″ or L/400.

If your application is not addressed by the load tables found in this website, please contact Grating Pacific for assistance selecting the product most appropriate for your application.

Steel products are commonly provided with one of three finishes: bare steel (no finish); painted with one coat of manufacturers red, black, or silver paint; or hot dip galvanized in accordance with ASTM A123.

If you are looking for more details, kindly visit Shunbo Steel Grating.

Additional reading:
Buyer's Guide to Building with Gabion Wall

Aluminum products are offered mill finish with optional chemical cleaning or anodizing also available.

Stainless Steel products typically require secondary cleaning due to discoloration that occurs during welding and fabrication. Commercial cleaning, passivation, or abrasive blasting can provide a uniform matte surface while electro-polishing leaves a bright stainless finish.

All products can be provided with specialty finishes including enamel or epoxy paints, or powder coating. When considering specialty finishes, contact Grating Pacific for consultation.

The open ends of the grating may be banded to provide additional transverse stiffness and a finished architectural appearance.  Achieved by welding a flat bar, similar in size to the bearing bars, to the cut ends, banding enhances safety and should always be specified when gratings are designed to be removable.

Banding can reduce impact stress by transferring load to adjacent bearing bars and should always be specified when gratings are subject to vehicular loads. Further banding descriptions and welding standards can be found here. 

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Hi everyone. I am a new engineer, and I am having some trouble doing a hand calculation. (My mentor at work gave me this assignment and said a simple hand calc would suffice)

The problem I am working on is that we have a Bar Grating installed spanning two ledges, almost making a bridge. It is about 4ft long (also the way the bars run) by 2ft wide. However, there is a spot that is 9 inches wide, and 8 inches deep, where there is a cut out. I figured out that 5 of the bars will not be able to span to both ledges, making 5 cantilevered beams.

I am supposed to figure out a way to make it take a certain load, around 250-300lbs per square foot. I can do this however I want, but he said probably either by welding a bar to the ends of the 5. Or by welding an angle somewhere.

As a new engineer I really need some guidance. I am not sure how to go about assuming things and being able to do a hand calculation. Ive been trying to do some beam analysis, but am not sure how to do it for more than one bar in a row. Any help or tips would be great Basically you have a simply support beam with varying moment of inertia. Say at each end, there are 16 bearing bars accross the width, then I1 = 16xI(individual bar), and after cutting 5 at the opening, I2 = 11xI. Do an analysis on this beam by trial to derive an uniform, or concentrate load, that meets both strength and deflection criteria (see manufacturers' manual for info).

If the resulting load is acceptable, weld a piece of plate (same depth and thickness as the bearing bar) accross the 5 cut-off's to the adjacent full length bars (total 6 spaces). Do the same at opposite side to form an enclosed cut-out.

If the resulting load is inadequate, you may provide an angle accross the 2' width somewhere in the beam to make it a 2 span beam. You need to provide end anchorges for this case.