## AutoCAD Structural Detailing General DIscussion

Distinguished Contributor
Posts: 141
Registered: ‎06-23-2011
Message 1 of 5 (2,050 Views)

# Grating Weight Calculation

2050 Views, 4 Replies
02-16-2013 06:12 AM

How the heck is the weights calculated for grating?

For example:

I'm using a 15-DT-4 with 1 1/2" x 3/16 bars.

Per the product load tables, it weighs 13.82 pounds per sq. foot.

The "Self-weight/m2" I need to use to make it properly show the square foot weight is 0.096.

Later if I modify the properties of a peice of grate, this shows up as 1/8"

Can this be fixed?

I have to make a dummy 12x12 pc. of grate and mess around till the weight shows proper in a BOM.

It is almost as if when using Imperial units, some features are still using Metric.

Distinguished Contributor
Posts: 141
Registered: ‎06-23-2011
Message 2 of 5 (1,991 Views)

# Re: Grating Weight Calculation

02-20-2013 07:56 AM in reply to: markhubrich

Here is a grate 12"x12"

Monkey around to get the proper weight value for a material list

Go back and modify

The self weight now says 1/8".

It just doesn't make sense. .096 is not 1/8" let alone a dimension compared to a weight?

Please someone explain what "Unit (lb/ft) really means. This is a one square foot peice of grate. The manufacturer spec is 13.82 pounds per square foot. I am using RBCS-01.dwt. My units are set as Architectural with 1/16" precision.

Next blunder is the length.

Grate length is determined by the gearing bar direction. Grate is manufactured typically in 36" width and the bearing bar direction is the length. I get mine at 20 foot.

If I rotate the bearing bar direction, the length remains the same.

Valued Contributor
Posts: 86
Registered: ‎04-26-2011
Message 3 of 5 (1,909 Views)

# Re: Grating Weight Calculation

02-27-2013 10:43 AM in reply to: markhubrich

Thanks for taking the time to make that so clear!  I have hated that problem.  I finally gave up on adding it to BOM because it was throwing off the total weight of a platform.

But, I agree!  This one should be easily fixed and done soon!!!!

Distinguished Contributor
Posts: 141
Registered: ‎06-23-2011
Message 4 of 5 (1,907 Views)

# Re: Grating Weight Calculation

02-27-2013 01:38 PM in reply to: tedmail

I recieved feedback from Autodesk on this. To make a long story short, the value that needs to go into the weight box is pounds per square inch for Imperial units.

I have another post about the length issues. That one makes me angry. I guess they see having the correct length on grate as a feature.

Valued Contributor
Posts: 86
Registered: ‎04-26-2011
Message 5 of 5 (1,777 Views)

# Re: Grating Weight Calculation

03-08-2013 04:17 PM in reply to: markhubrich

They need to clean that interface up...

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