I download a Metal shape from the library and test.
L, Equals legs, 8X8X1, 18'
In the material (File > Properties > Material) I select Steel with density 7,84 gr/ cm³
From Physical Properties I obtained:
Weight = Masa = 9,154319495E2 lbm = 915,43 lbm
From Beer and Johston, Streght of...