Adding an aluminum channel size to library

[shane.doyleNLUPQ]

Using AS 2021, I'm trying to add an aluminum channel size to the EXT_AISC_C-Channel_Aluminum library. I don't know what the EY number is, also what is the U number in the table. Also, the "G (kg per meter)" doesn't work out for anything I'm familiar with. I'm trying to add a C8x5.62. so 5.62 pounds per foot converted to kg per meter works out to 8.36 kg per meter. However, when I look at existing members in that table, the weight per meter of a lighter beam, the C8x4.362 is listed as 18.873. What is that number, or what should it be for the C8x5.62? what should the numbers be in this screenshot?

[acbsdesign]

@shane.doyleNLUPQ 

HI,

Model one channel 1 foot with the material grade that you will be using, such as 6061, 6063, etc. and check the weight in AS Properties and adjust the weight in the table by using the "cross rule" or sim.

If you don't have to do design calc's you don't have to enter the moment of inertia etc, only Depth, Flange width, web and flange thickness, and radius 'r'.

[shane.doyleNLUPQ]

What is the cross rule? And how can I model the channel if the information isn't there to model the channel? Seems like that table would need to be filled out first to make a model of it. What is the EY and U numbers?
Thanks.