Re: Hanger table from Caesar

>theoretical installed load in
>hanger table report obtained is not matching exactly with the Fz load in
>sustained case, why is it so?

I don't use CAESAR and I don't know exactly how it does things, but you might want to check to see if the difference may come from the way that weight is distributed. Half the hangar weight as modelled may be distributed to the reaction point and the program doesn't include this in the hangar load. I've seen this happen with other software.

Verify what you have by finding the entire weight of the system including the hangers and supports, and the weights of the hangers themselves. First compare compare the sum of the Fz loads against calculated total system weight. These should be the same. Then compare the total hangar (and other support element loads) loads to the sum of the Fz values and if there is any difference check that against half the weight of the hangars.

While you're at it check your manual calculations for the weight against what the program calculates. If you don't have manual weight calculations, make some using a spreadsheet--that's the only way you'll know if you've actually input what you think you've input. Then sum all the reactions and verify that the sum of the reaction forces equals the weight of the system plus any external loads. Verify moment equilibrium too. With a spreadsheet it's not exactly easy but it's not that hard, and it will give you a valuable input check.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)